Updated on 2022/05/17

写真a

 
WANG, Hailong
 
Affiliation
Faculty of Science and Engineering, Global Center for Science and Engineering
Job title
Associate Professor(without tenure)
Mail Address
メールアドレス

Research Institute

  • 2020
    -
    2022

    理工学術院総合研究所   兼任研究員

Education

  • 2011.10
    -
    2014.09

    The university of Tokyo   graduate school   Department of Civil engineering  

  • 2007.09
    -
    2010.07

    Southwest Jiaotong University   graduate school   Department of Road and Railway Engineering  

  • 2003.09
    -
    2007.07

    Shandong Jiaotong University   Department of Civil engineering  

Degree

  • 2014.06   The University of Tokyo   Ph.D

Research Experience

  • 2020.04
    -
    Now

    Global Center for Science and Engineering Faculty of Science and Engineering, Waseda University   Associate Professor

  • 2018.04
    -
    2020.03

    Waseda University   Research Institute for Science and Engineering   Assistant Professor

  • 2015.04
    -
    2018.03

    OYO Corporation   Tokyo Regional Office

  • 2014.10
    -
    2015.03

    The University of Tokyo   Institute of Industrial Science   Project Researcher

Professional Memberships

  • 2020.02
    -
    Now

    Japan Society of Civil Engineering

  •  
     
     

    THE JAPANESE GEOTECHNICAL SOCIETY

 

Research Areas

  • Geotechnical engineering   薬液注入

  • Environmental materials and recycle technology   CO2固定鉱物の有効利用

  • Geotechnical engineering   properties of compacted bentonite as buffer material in geological disposal

Research Interests

  • 薬液注入

  • CO2固定鉱物

  • iron ore fines

  • swelling property

  • laboratory test

  • buffer material

  • geological disposal

  • bentonite

  • unsaturated soil

  • liquefaction

▼display all

Papers

  • On swelling behaviors of a bentonite under different water contents

    Hailong Wang, Dachi Ito, Takumi Shirakawabe, Kunlin Ruan, Hideo Komine

    Géotechnique     1 - 17  2022.05  [Refereed]

    Authorship:Lead author, Corresponding author

     View Summary

    This study starts from a question: how would initial water content (wi) affect equilibrium swelling pressure (peq) of compacted bentonites in swelling pressure tests (ps tests)? However, discussions, based on experiments of a bentonite, Kunigel V1 (K_V1), are extended to issues: 1) wi effect on peq, 2) pore water density (ρpw), 3) co-existence of crystalline and osmotic swelling, and 4) relation between peq and compaction tests (pc tests). It is revealed that wi has insignificant effect on peq in general, though significant effect may appear for relatively high wi and dry density (ρd) conditions. Two swelling types, crystalline swelling with basal spacing of montmorillonite (d001= 1.0 nm - 1.9 nm) and osmotic swelling (d001 ≥ ∼4.0 nm), co-exist in a w range from 36 to 65%. With the fact that ρpw of K_V1 may range from 1.1 to 1.2 Mg/m3, it is expected that crystalline swelling may mainly govern peq in ps tests if the final dry density of a specimen (ρdf) is larger than 1.46 Mg/m3, while osmotic swelling may mainly govern if ρdf <1.05 Mg/m3. Together with results of pc tests, the effect of wi on peq are explained by the proposed conceptual model.

    DOI

  • Effects of specimen thickness on apparent swelling pressure evolution of compacted bentonite

    Hailong Wang, Kunlin Ruan, Satoru Harasaki, Hideo Komine

    Soils and Foundations   62 ( 1 ) 101099 - 101099  2022.02  [Refereed]

    Authorship:Lead author, Corresponding author

    DOI

  • A swelling pressure cell for X-ray diffraction test

    Hailong Wang, Hideo Komine, Takahiro Gotoh

    Géotechnique     1 - 12  2021.03  [Refereed]

    Authorship:Lead author, Corresponding author

    DOI

  • Development of a Multifunctional Triaxial System for Unsaturated Soils: Addition of Permeameter Function

    Hailong Wang, Jaylord U. Tan Tian, Junichi Koseki, Takeshi Sato

    Geotechnical Testing Journal   44 ( 2 ) 422 - 439  2021.03  [Refereed]

    Authorship:Lead author, Corresponding author

    DOI

  • Water retention characteristics of iron ore fines

    Hailong Wang, Junichi Koseki, Tomoyoshi Nishimura

    Canadian Geotechnical Journal   57 ( 9 ) 1427 - 1437  2020.09  [Refereed]

    Authorship:Lead author, Corresponding author

     View Summary

    Evaluations of water retention characteristics of typical iron ore fines (IOF) were presented, which was part of experimental works for the estimation of liquefaction potential of IOF heaps. The water retention tests were conducted in a suction range from 0.1 to 106 kPa on two IOFs and two artificial soils with various testing techniques. It is observed that water retention characteristic curves of one IOF (IOF-B) converge in terms of the relationship between suction (S) and water content (w) regardless densities of specimens when S exceeds a threshold value (Sth). Based on this finding, water retention characteristics are divided into density and materials affected zones. It is also found that IOFs generally have higher water retention ability than the two artificial soils, from which discussion is made on the effect of specific surface area and mineralogy on water retention characteristics of IOF. Finally, water retention characteristics are linked to compaction curves, from which, with the consideration that degree of saturation at peaks of compaction curves is relatively constant, a safety margin of a recently proposed regulation for maritime transportation of IOF is discussed.

    DOI

  • Hydration and dehydration of water of bentonite: a solid-state 1H magic-angle spinning NMR study

    Hailong Wang, Toshimichi Shibue, Hideo Komine

    Chemical Physics   536   110796 - 110796  2020.08  [Refereed]

    Authorship:Lead author

    DOI

  • Movement of water in compacted bentonite and its relation with swelling pressure

    Hailong Wang, Takumi Shirakawabe, Hideo Komine, Daichi Ito, Takahiro Gotoh, Yuta Ichikawa, Qiao Chen

    Canadian Geotechnical Journal   57 ( 6 ) 921 - 932  2020.06  [Refereed]

    Authorship:Lead author, Corresponding author

     View Summary

    A testing procedure was proposed to study water movement in compacted bentonite and the development of swelling pressure (ps) when compacted bentonite specimens were wetted. In this procedure, a multi-ring mold was introduced for ps measurements, after which the specimen was sliced for X-ray diffraction to find movement of water in the interlayer space of montmorillonite. Results revealed a relation between four phases of ps development and evolution of four states of interlayer water molecule arrangement of montmorillonite (L): when ps reached its first peak in phase I, L moved from 1 row water arrangement (1w) to at least 2w; when ps decreased and re-increased in phases II or III, L moved from 2w to at least 3w; and when ps reached a steady state in phase IV, L = 3w. The w distribution in the compacted bentonite was also measured as water absorption time increased. Based on those results, the global water movement was estimated in terms of diffusivity (D) following a method employing Boltzmann transform. Results of comparisons implied that D calculated using this method matched experimental data well and the method was rather easily handled.

    DOI

  • Permeability of saturated and unsaturated iron ore fines

    H. Wang, J. Koseki, T. Nishimura

    Japanese Geotechnical Society Special Publication   7 ( 2 ) 401 - 409  2019.04  [Refereed]

    Authorship:Lead author, Corresponding author

    DOI

  • Undrained monotonic triaxial loading behaviors of a type of iron ore fines

    Hailong Wang, Junichi Koseki, Fei Cai, Tomoyoshi Nishimura

    Canadian Geotechnical Journal   55 ( 9 ) 1349 - 1357  2018.09  [Refereed]

    Authorship:Lead author, Corresponding author

     View Summary

    Concerning the static liquefaction properties of an industrial cargo, i.e., iron ore fines (IOF), undrained monotonic behaviors of a type of IOF are revealed through conducting triaxial compression tests. It is found that IOF exhibit some similar behaviors as those of common sandy soils, while some very unusual behaviors are also observed. All IOF specimens with compaction degree of 84%–95% and confining pressure of 50–200 kPa exhibit dilative behavior from the beginning of axial loading until the deviator stresses reach their peaks (qpk). Then the dilative behavior transforms to a contractive behavior, and the contractive behavior continues until reaching the residual stress without observation of phase transformation and quasi steady state. These behaviors are not usually observed for common sandy soils based on extensive previous works. More studies may be necessary as these unusual behaviors imply that flow failure, similar to the undrained monotonic behavior of very loose sand, may be triggered regardless of the density of IOF. In addition, this study also establishes the relationships of IOF between its initial conditions, peak stress conditions, and residual conditions by employing classical knowledges developed for sandy soils.

    DOI

  • Numerical evaluation of liquefaction potential of the heap of iron ore fines during maritime transportation

    H.Wang, J.Koseki F.Cai

    Proc. 19th Int. Conf. of SMGE     1447 - 1450  2017.09  [Refereed]

  • Membrane filter properties and application of the filter to undrained cyclic triaxial test of unsaturated materials

    Hailong Wang, Junichi Koseki, Tomoyoshi Nishimura, Yukika Miyashita

    Canadian Geotechnical Journal   54 ( 8 ) 1196 - 1202  2017  [Refereed]

    Authorship:Lead author, Corresponding author

     View Summary

    Properties of the membrane filter recently introduced as an alternative to the ceramic disk are revealed through diffusion and hydraulic conductivity tests. It is shown that diffusion of air through the membrane filter is significantly affected by suction magnitude and that hydraulic conductivity of the membrane filter can easily be affected by the quality of water used in the test. The application of the membrane filter to the soil-water characteristic curve tests (SWCC tests) shows that similar SWCCs can be obtained by employing pressure plate apparatuses with either the ceramic disks or the membrane filter installed, and that repeatability of the SWCC by using the membrane filter pressure plate apparatus is reasonably good. The application of the membrane filter to the undrained cyclic loading test of unsaturated sandy materials shows that the response (the duration to measure the equilibrated pore-water pressure of unsaturated materials) of the membrane filter pedestal in a modified triaxial system may be as short as ~2 s in certain test conditions,andfairlygoodpore-waterpressureandairpressuremeasurementscan be obtained during undrained cyclic loading with a loading frequency of 0.1 Hz.

    DOI

  • P-constant condition applied to undrained cyclic triaxial test of unsaturated soils

    H. Wang, J. Koseki, T. Sato

    Geotechnical Testing Journal   40 ( 4 ) 710 - 718  2017  [Refereed]

    Authorship:Lead author, Corresponding author

     View Summary

    To evaluate the liquefaction resistance of unsaturated soils by a triaxial system, it is suggested to keep a p-constant condition rather than the rh-constant condition (i.e., cell pressure constant) that is normally applied to the same test for saturated specimen. The main concern is that the pore pressure coefficient (B value) of unsaturated specimens may be far less than unity, which causes undesired effects on the behaviors of unsaturated soils. A modified triaxial system that can maintain the p-constant condition has been recently developed. By using the system, the behaviors of an unsaturated soil subjected to undrained cyclic triaxial loading are compared between the p-constant condition and the rh-constant condition, which implies that the testing conditions affect behaviors of pore pressures generation, stress strain relationship, etc. Results suggest that tests under the rh-constant condition underestimate the liquefaction resistance of soils. In addition, the modified triaxial system could effectively reduce the variation of p by more than 60 % in the full tested range, or by 75 % in a range with relatively small magnitude of the vertical loading based on test results of three sandy soils.

    DOI

  • Effect of saturation on liquefaction resistance of iron ore fines and two sandy soils

    Hailong Wang, Junichi Koseki, Takeshi Sato, Gabriele Chiaro, Jaylord Tan Tian

    SOILS AND FOUNDATIONS   56 ( 4 ) 732 - 744  2016.08  [Refereed]

    Authorship:Lead author, Corresponding author

     View Summary

    Over the past several years, the International Maritime Organization (IMO) has become increasingly concerned about the liquefaction of unsaturated solid bulk cargo (e.g. iron ore fines) during maritime transportation. This concern has arisen due to several accidents including the capsizing of vessels. In addition, although the resistance against liquefaction of ordinary unsaturated soils is higher than for saturated soils, possible key parameters governing the liquefaction resistance of unsaturated soils (R-L,R- unsat) have not yet been clearly identified. Therefore, in this study, undrained cyclic loading tests of saturated and unsaturated iron ore fines and two sandy soils were conducted using a triaxial apparatus to reveal the liquefaction behavior of iron ore fines and to find the key parameters governing R-L,R- unsat. Through comparisons, it was found that the liquefaction behavior of iron ore fines is similar to that of sandy soils. The degree of saturation and potential volumetric strain, which have been proposed as the governing parameters of R-L,R- unsat, were examined based on experimental data obtained in this study and by other researchers. It was shown that neither of the two parameters correlate with the liquefaction resistance ratio (LRR), a ratio of RL,,,, to the liquefaction resistance of the saturated soils (R-L,R- unsat) with a unique relationship, especially when considering soils with considerable fines content. Following the concept of potential volumetric strain, which considers the compressibility of pore air in the unsaturated soils, volumetric expansion due to the reduction in confining pressure during cyclic loading is further considered, and a new index, the volumetric strain ratio (Rv) is proposed in this study. According to the experimental data obtained in this study, Rv exhibits a much better correlation with LRR than the two former parameters. (C) 2016 The Japanese Geotechnical Society. Production and hosting by Elsevier B.V.

    DOI

  • A System to Measure Volume Change of Unsaturated Soils in Undrained Cyclic Triaxial Tests

    H. Wang, T. Sato, J. Koseki, G. Chiaro, J. Tan Tian

    GEOTECHNICAL TESTING JOURNAL   39 ( 4 ) 532 - 542  2016.07  [Refereed]

    Authorship:Lead author, Corresponding author

     View Summary

    It is common to employ a traditional double cell system, of which an open-ended inner cell is installed in an ordinary triaxial apparatus, to measure the volume change of unsaturated specimens. In such a system, the total apparent volumetric strain of the specimen (epsilon(v)) is deduced from the water level change in the inner cell, monitored by a differential pressure transducer (DPT) considering, meanwhile, the top cap intrusion into the inner cell recorded by a vertical displacement transducer (VDT). Severe apparent volumetric strain, caused by the compliance of the double cell system(epsilon(v,SC)), was observed during the undrained cyclic loading tests in a previous study. Test results on a steel-spring dummy specimen revealed that epsilon(v,SC) was induced not only by such as the meniscus effect, but unexpectedly also by the asynchronous responses between the DPT and the VDT (i.e., the response of the DPT was delayed compared with that of the VDT). By doing some treatment epsilon(v,SC) could be reduced to some extent, whereas the magnitude of epsilon(v,SC) was still too high to be acceptable when the tested specimen approached the liquefied state. To radically solve these technical difficulties, a modified double cell system, named the linkage double cell system, was developed in this study. In this modified system, a linkage rod moving simultaneously with the loading shaft was introduced, through which the DPT could directly measure epsilon(v) without considering the top cap or loading shaft intrusion. Test results for the steel-spring dummy specimen as well as for saturated and unsaturated soil specimens demonstrated that the linkage double cell system has major advantages in measuring accurately the volume change of the specimen during undrained cyclic triaxial loading tests compared with the traditional double cell system.

    DOI

  • Geotechnical properties of a type of iron ore fines

    Hailong Wang, Junichi Koseki, Takeshi Sato, Yukika Miyashita

    15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2015: New Innovations and Sustainability   2 ( 14 ) 541 - 546  2015  [Refereed]

     View Summary

    Accidents and life loss caused serious concern on the liquefaction problem of some solid bulk cargoes such as iron ore fines during transportation at sea. To understand the liquefaction property of a type of iron ore fines, a series of tests, e.g. SEM observation, monotonic loading triaxial test, cyclic loading triaxial test etc. were conducted. Test results show that this unusual material possesses some special properties, for instance, much higher specific gravity Gs (average Gs=4.444) as compared to common materials in geotechnical engineering. SEM observation unveils that the tested iron ore fines has a multi-layer, micro-porous structure which may affect its water retention ability under unsaturated states. The result from the undrained monotonic loading test indicates an angle of internal friction of 45.6° according to the Mohr-Coulomb failure criterion. Interestingly, the peak strength and the residual strength were achieved at values of axial strain of approximately 2.5% and 13%, respectively, regardless of confining pressure among three undrained monotonic loading tests. The undrained response of tested iron ore fines to cyclic loading shows similar characteristics as those of common sands and the liquefaction resistance of this material defined based on the relationship between cyclic stress ratio (CSR) and number of cycle is not significantly affected by change of confining pressure.

    DOI

  • Experimental evaluation of liquefaction resistance of unsaturated sandy soils

    Hailong Wang, Junichi Koseki, Takeshi Sato, Jaylord Tan Tian

    DEFORMATION CHARACTERISTICS OF GEOMATERIALS   6   299 - 306  2015  [Refereed]

     View Summary

    A series of undrained cyclic loading tests of three types of saturated and unsaturated soils were conducted on a triaxial apparatus. To overcome the difficulties of this type of test, cell pressure control system to maintain constant p, membrane filter technique to measure pore water pressure and double cell system to measure volumetric strain (epsilon v) were introduced to the apparatus. Test results shown that the cell pressure control system reduced more than 60% variation of p which would be induced by applying vertical cyclic loading. The membrane filter technique could measure negative pore water pressure in a prompt manner and as a result suction of the unsaturated specimens was well monitored under the 0.1 Hz cyclic loading. The time delay problem of electric transducer employed in the epsilon v measurement system, which may bring significant system error, was recognized and the measurement error of epsilon(v) was discussed. Regarding the resistance against liquefaction of the unsaturated soils, the test results shown increase in resistance with reduction in degree of saturation and the p-constant condition was necessary to correctly evaluate the resistance for the unsaturated soils.

    DOI

  • SWCC measurement of two types of iron ore fines

    H. Wang, J. Koseki, T. Nishimura

    UNSATURATED SOILS: RESEARCH & APPLICATIONS, VOLS 1 AND 2     973 - 979  2014  [Refereed]

     View Summary

    This paper presents results from measurement of SWCC (Soil Water Characteristic Curve) of two types of iron ore fines. SWCC tests in both high suction range (103 kPa-10(6) kPa) and low suction range (0.1 kPa-100 kPa) were conducted. In low suction range, pressure plate apparatuses were employed, on which either a high air entry ceramic disk or a membrane filter was installed. In high suction range, the vapor equilibrium technique and the method of electric conductivity were applied. As a reference, SWCC tests on natural material mixtures simulating gradations of iron ore fines were also carried out. Comparisons were made between SWCCs obtained by using the ceramic disc and the membrane filter as well as SWCCs of the iron ore fine and its reference sand. In addition, effects of gradation and density of tested materials on the SWCC were discussed.

  • (Discussion) A model for hydraulic conductivity of compacted bentonite – inclusion of microstructure effects under confined wetting

    Tian Chen, Majid Sedighi, Andrey Jivkov, Suresh Seetharam, Hailong Wang

    Géotechnique     1 - 3  2022.03

    DOI

  • On methods to measure cation exchange capacity and amounts of leached cations of bentonites

    Takumi SHIRAKAWABE, Hailong WANG, Shoji MORODOME, Hideo KOMINE

    Japanese Geotechnical Journal   17 ( 1 ) 61 - 71  2022.03  [Refereed]

  • STUDY OF THERMAL HISTORY EFFECT ON WATER MOVEMENT IN UNSATURATED BENTONITE

    Takumi SHIRAKAWABE, Hailong WANG, Shigeru GOTO, Shuichi YAMAMOTO, Hideo KOMINE

    Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)   77 ( 2 ) 103 - 117  2021  [Refereed]

    DOI

  • Development of testing method with X-ray diffraction to explore swelling pressure behaviors of compacted bentonite

    Hailong Wang, Hideo Komine, Diichi Ito, Takahiro Gotoh

       2021.01  [Refereed]

    Authorship:Lead author, Corresponding author

  • Influence of bentonite type and producing method on hydraulic conductivity of sand–bentonite mixture

    Tomonori Sakita, Hideo Komine, Atsuo Yamada, Hailong Wang, Shigeru Goto

    E3S Web of Conferences   205   10005 - 10005  2020.11  [Refereed]

     View Summary

    Sand-bentonite mixtures with bentonite content of 10-30% had been planned to handle low-level radioactive waste in Japan, because of its low permeability. Hydraulic conductivity of sand–bentonite mixture depends on the bentonite type, bentonite content, initial water content, and other factors. Given this background, falling head permeability tests were conducted on sand–bentonite mixture by varying the compaction energy for specimen preparation, initial water content (10–20%), and bentonite content (15– 30%). For these tests, the hydraulic gradient of 25-500 was set. Consequently, the hydraulic conductivities were 10-8 – 10-13 m/s for all tested conditions. Correlation between the hydraulic conductivity and the effective montmorillonite dry density (montmorillonite mass divided by the sum of montmorillonite, air, water volume), which is often used to correlate the hydraulic conductivity of bentonite, was found. Correlation was also found between the hydraulic conductivity and a new index designated as the effective montmorillonite wet density (sum of montmorillonite and water mass / sum of montmorillonite, air, water volume). Effective montmorillonite wet density reveals differences in the specimen structural distribution through consideration of the initial water content.

    DOI

  • Experimental study on effect by cementation on self-sealing capability of bentonite buffer material

    Daichi Ito, Hideo Komine, Hailong Wang

    E3S Web of Conferences   205   10004 - 10004  2020.11

    Authorship:Last author

     View Summary

    In Japanese project for disposal of high-level radioactive waste, the self-sealing capability of bentonite buffer material, which results from the swelling deformation to fill the gaps between waste container and wall of disposal pit, must be retained thousands of years. However, because of the effect of high pressures, occurrence of cementation and property changes of the buffer material are a concern. Few studies had examined cementation effects because of the difficulties for simulating long-term alteration process experimentally. In this paper, swelling properties of consolidated buffer are regarded as similar as those of naturally consolidated bentonite ore. Therefore, three kinds of bentonite ores were used for experiments to elucidate influences of cementation on self-sealing capabilities. Undisturbed and reconstituted specimens were prepared to assess their swelling pressures after filling a preset gap in a swelling pressure apparatus. Results show that for Japanese ores, the swelling pressure of undisturbed specimens is about half that of reconstituted specimens. For American and Chinese ores, the difference of swelling pressure is greater when the preset gap is smaller. Results imply that effects of cementation on self-sealing capability are smaller when swelling deformation is allowed.

    DOI

  • Development an apparatus for swelling pressure of compacted bentonite

    Hailong WANG, Takumi SHIRAKAWABE, Hideo KOMINE

      21-5-5-01  2020.07

    Authorship:Lead author, Corresponding author

  • 短期間の温度履歴を付与したベントナイトの吸水挙動に及ぼす影響に関する推察

    白河部匠, 小峯秀雄, 後藤茂, 王海龍, 山本修一, 豊田淳史

    第13回環境地盤工学シンポジウム発表論文集   14-3 ( 14-3 ) 455 - 460  2019.09  [Refereed]

  • 産業廃棄物処分場におけるカルシウムスケール抑制を目指したCa 吸着層に用いる材料のCa 吸着特性評価

    高橋智也, 多賀春生, 小峯秀雄, 後藤茂, 王海龍, 鈴木清彦, 杉本和聡, 國弘彩

    第13回環境地盤工学シンポジウム発表論文集   8-4 ( 8-4 ) 271 - 274  2019.09  [Refereed]

  • A System to Measure Permeability of Unsaturated Soils using Local Pin-Type Sensors in Triaxial Apparatus

    Jaylord U. Tan Tian, Junichi Koseki, Hailong Wang, Hiroyuki Kyokawa, Takeshi Sato

    Japanese Geotechnical Society Special Publication   7 ( 2 ) 305 - 309  2019.04  [Refereed]

     View Summary

    <p>This paper describes development of a triaxial permeameter apparatus for measuring coefficient of permeability of unsaturated soils by directly measuring the head difference between two points in a specimen using local pin-type sensors. The local pin-type sensors are made of stainless steel wrapped with membrane filter to measure suction. The apparatus includes the measurement of inflow rate by Mariotte's bottle and a weighing scale, while outflow rate is measured by burettes and a differential pressure transducer (DPT). Typical results show that the steady state flow condition can be achieved by using membrane filters to allow passage of water but prevent flow of free air. At steady state flow condition and reasonably stable measured head by the local pin-type sensors, permeability values were obtained by simple average.</p>

    DOI CiNii

  • Evaluation of Liquefaction Resistance of Unsaturated Soils using Volumetric Strain Ratio (Rv) Index

    J.Tan Tian, H. WANG, J. Koseki

    20th Int. Summer Symp.     71 - 72  2018.08

  • A Conceptual Model between Water Ratio in Volume and Suction of Unsaturated Materials

    H.Wang J.Koseki

    53rd JGS annual conf.     711 - 712  2018.07

  • Local measurement of the permeability of sands using pin-type sensors in triaxial apparatus

    J.Tan Tia, J.Koseki, H.Wang, T.Sato

    18th Int. Summer Symp     57 - 58  2016.09

  • Linkage double cell system for cyclic triaxial test of unsaturated soils

    H.Wang, J.Koseki, T.Sato, Y.Miyashita

    51st JGS annual conf.     713 - 714  2016.09

  • Unsaturated seepage-deformation coupled analysis about liquefaction of heap of iron ore fines during maritime transportation

    T. Matsumaru, J.Koseki, H.Wang

    50th JGS annual conf.     717 - 718  2015.09

  • A new index to evaluate liquefaction resistance of partially saturated sandy soils

    H.Wang, J.Koseki, T.Sato, Y.Miyashita

    50th JGS annual conf.     715 - 716  2015.09

  • Cyclic triaxial tests on saturated/unsaturated iron ore fines and sandy soils

    J.Koseki, H.Wang, T.Sato, Y.Miyashita

    Seisan-kenkyu   66 ( 6 ) 569 - 572  2015.01  [Refereed]

    DOI

  • Effects of suction and fines content on liquefaction property of unsaturated soils

    H.Wang, J.Koseki T.Sato

    49th JGS annual conf.     1941 - 1942  2014.07

  • Resistance against liquefaction of unsaturated Toyoura sand and Inagi sand

    H.Wang, J.Koseki T.Sato

    Bulletin of ERS   ( 47 ) 3 - 14  2014.03

  • Liquefaction property of unsaturated Inagi sand and Toyoura sand

    H.Wang J.Koseki

    Proc. 2nd JAEE Int. Symp. on Earthquake Engineering     87 - 94  2013.11

  • Liquefaction resistance of unsaturated Inagi sand

    H.Wang J.Koseki

    68th JSCE annual meeting     61 - 62  2013.09

▼display all

Misc

  • 【Testing method】Compact bentonite specimen with thickness of 2 mm

    Hailong Wang

       2022.04

    Authorship:Lead author, Corresponding author

  • [Personal insterests updated] Statistics on Journals in Geotechnical Engineering

    Hailong Wang

    no    2022.03

    Authorship:Lead author, Last author

    Other  

  • 【Apparatus design】Swelling pressure apparatus with pressure sensor

    Hailong Wang

    Related paper: ) Soils and Foundations https://doi.org/10.1016/j.sandf.2021.101099    2022.02

    Authorship:Lead author, Last author, Corresponding author

  • ”Apparatus design drawing” swelling pressure apparatus with load cell

    Hailong Wang

       2021.09

    Authorship:Lead author, Last author, Corresponding author

  • ”Apparatus design drawing” X-ray swelling pressure cell

    Hailong Wang

    Related paper: Geotechnique, https://doi.org/10.1680/jgeot.20.00005    2021.09

    Authorship:Lead author, Last author, Corresponding author

Awards

  • WASEDA e-Teaching Award Good Practice

    2022.01   Waseda University  

  • Best presentation Award at 53th JGS Annual Conference

    2018.09   The Japanese Geotechnical Society   A Conceptual Model between Water Ratio in Volume and Suction of Unsaturated Materials

    Winner: Hailong Wang

  • Best presentation Award at 50th JGS Annual Conference

    2015.10   The Japanese Geotechnical Society   A new index to evaluate liquefaction resistance of partially saturated sandy soils

    Winner: Hailong Wang

Specific Research

  • 締固めた不飽和ベントナイトの吸水膨潤プロセスに伴う現象の相互作用の解明

    2021  

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    本研究では,独自な実験手法により,乾燥密度が異なるベントナイトの水分拡散係数のデータベースを構築した.具体的には,乾燥密度1.2~1.7Mg/m3の範囲で,同様な飽和度条件において密度が高いほど水分拡散係数が高くなることが確認された.また,独自で開発した膨潤圧・XRD実験装置を用いて,ベントナイトの吸水による水分のモンモリロナイトの層間の間の拡散が存在することが確認された.また,ベントナイトの密度が一定の値を超えると,層間の浸透性膨潤が無くなることが定量的に評価した.

  • 沿岸部処分システムにおける緩衝材の地下水浸潤プロセスの実験的評価およびモデル化

    2021  

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    本研究では,国産ベントナイト:クニゲルV1と海外産ベントナイト:MX80を対象に,濃度が異なるNaCl水溶液で浸潤する際に発生した水分の拡散とNaイオンの拡散現象を検討した.NaCl水溶液の濃度は,0.5M,1.0Mと2.0Mとし,浸潤時間は,1-3840hの範囲で12ケースにした.NaCl水溶液の濃度が高いほど,水分の拡散が早くなると,Naイオンの移動は,水分の移動と比べて著しく遅延していることが確認された.ベントナイトにおけるイオンの移動遅延については,新たな発見として,今後継続してメカニズムを追求する. &nbsp;

  • 締固めたベントナイトの吸水に伴う水分拡散・圧密・保水挙動のメカニズム究明

    2020  

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    本研究は,高レベル放射性廃棄物の地層処分における緩衝材設計の合理化や安全性評価の高度化に資する締固めた不飽和ベントナイトの吸水膨潤プロセスに伴う現象の相互作用を解明することを目的とする.このプロセスで発生する水分の拡散,モンモリロナイトの膨潤,および土粒子骨格の圧密現象と,各現象の相互関係を系統的な室内実験により明らかにする.本年度の研究では,ベントナイトの膨潤圧メカニズムを着目し,膨潤圧に及ぼす供試体のサイズ,初期含水比の影響を実験的に検討した.応募者が開発した新たな実験装置により,短期間に多数のデータを取得することができ,これらの影響を明らかになっている.研究成果は,地盤工学分野において最も影響力の高い学術誌“Geotechque”に採用されていた.

  • 沿岸部における高レベル放射性廃棄物の地層処分に資する緩衝材の水分拡散に関する研究

    2020  

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    高レベル放射性廃棄物(HLW)の地層処分技術開発において,国は,廃棄物の沿岸部処分システム高度化開発が求められている.沿岸部処分の地下水は,海水環境であり,これまでに多く研究された淡水環境と異なり,地下水の浸入により緩衝材が不飽和状態から飽和状態へ遷移する再冠水段階において,緊急性の高い検討項目となる.本研究では,核燃料サイクル機構の検討結果を踏まえて,高レベル放射性廃棄物地層処分における緩衝材の候補材料とされるベントナイト(クニゲルV1,クニミネ工業)を用いて,締固めた供試体に,沿岸部処分の地下水環境を模擬した塩素酸ナトリウムを使用し,ベントナイト系緩衝材の膨潤特性を示す膨潤圧および水分移動特性を示す水分拡散係数を検討した.研究結果に基づき地下水質が緩衝材の膨潤特性および水分移動特性に及ぼす影響を確認した.

 

Syllabus

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Teaching Experience

  • Applied Mathematics for Civil and Environmental Engineers

    Waseda University  

    2021.04
    -
    Now
     

  • Surveying practice

    Waseda University  

    2020.04
    -
    Now
     

  • Introduction to Civil and Environmental Engineering

    Waseda University  

    2018.10
    -
    Now
     

  • Laboratory on Soil Mechanics

    Waseda University  

    2018.10
    -
    Now
     

  • SHIP Research Planning and Skill B

    Waseda University  

    2018.10
    -
    Now
     

  • Soil mechanics

    Waseda University  

    2018.10
    -
    Now
     

  • SHIP Collaborative Workshop

    Waseda University  

    2018.06
    -
    Now
     

  • Geotechnical Engineering

    Waseda University  

    2018.04
    -
    Now
     

  • Laboratory Work on Civil and Environmental Engineering

    Waseda University  

    2018.04
    -
    Now
     

  • SHIP Research Planning and Skill A

    Waseda University  

    2018.04
    -
    Now
     

  • Environmental Geotechnics

    Waseda University  

    2018.04
    -
    Now
     

  • Science and Engineering Laboratory

    Waseda University  

    2018.10
    -
    2022.03
     

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Committee Memberships

  • 2021.03
    -
    Now

    Japanese Geotechnical Society  災害調査データ委員会

  • 2020.06
    -
    Now

    Soils and Foundations - Editorial Board  Editorial Board

  • 2017.06
    -
    2020.06

    地盤工学会  地盤調査規格・基準委員会 WG2ボーリング・サンプリング