PROCEEDINGS OF GEOSHANGHAI 2018 INTERNATIONAL CONFERENCE: MULTI-PHYSICS PROCESSES IN SOIL MECHANICS AND ADVANCES IN GEOTECHNICAL TESTING 315-324 2018 [Refereed]
Journal of Japan Society of Civil Engineers, Ser. E1 (Pavement Engineering) 72(3) I_151-I_158 2016
This paper evaluates the synergistic effects of water content and fine fraction on shear behavior of unsaturated fouled ballast by performing a series of monotonic loading and repeated loading triaxial compression tests and water retention t...
JOURNAL OF PAVEMENT ENGINEERING, JSCE 70(3) I_65-I_70 2015
This study proposes two kinds of estimation methods for the frost heave ratio of unsaturated frost-susceptible soils under low overburden pressure such as subgrade soils at the pavement structure in cold regions. One is the modified Takashi's equ...
Journal of Japan Society of Civil Engineers, Ser. E1 (Pavement Engineering) 71(3) I_185-I_192 2015
This paper develops a coupled thermo-hydro-mechanical (THM) FE analysis, which can reproduce frost-heave phenomenon of soils observed in snowy cold regions, and examines the applicability of the proposed coupled THM analysis in terms of the valid...
Soils and Foundations 54(1) 67-80 Feb 2014 [Refereed]
This paper proposes a testing method for evaluating the effect of water content on the deformation-strength characteristics of unsaturated subbase course materials. A medium-size triaxial apparatus for unsaturated soils is newly developed in order...
Nowadays, in order to economize the cost of pavements, recycled crusher-run (recycled concrete) that is recycled material is employed as base course material instead of natural crusher-run (andesite). Therefore, mechanical response of recycled cru...
This study presents an experimental, analytical and numerical studies to elucidate the dynamic response of ballasted track structures subjected to horizontal seismic motions. First, a series of shaking table tests for one-third small-scale model b...
The aim of this study is to clarify strength characteristics of a subbase course material changed due to the degree of saturation and the strain rate. A series of monotonic triaxial compression tests was carried out under desired unsaturated and s...
This research examined the effect of freeze-thaw actions on the bearing capacity of base course material C-40 by using our newly developed freeze-thaw CBR test apparatus. It was found that freeze-thaw history caused a decrease in the CBR of C-40 u...
KAWABATA Shinichiro, ISHIKAWA Tatsuya, TOYOTA Kunio, YAMAUCHI Satoru, KAMEYAMA Shuichi
JOURNAL OF PAVEMENT ENGINEERING, JSCE 69(3) I_191-I_198 2013
The freezing condition of the NEXCO standard frost heave test (NEXCO method) was improved with the objective of reducing the variation in the results. Also, a large diameter testing apparatus was produced with a diameter up to Φ150 mm to enable t...
JOURNAL OF PAVEMENT ENGINEERING, JSCE 69(3) I_207-I_214 2013
This paper examines the effects of freeze-thaw and water content on the resilient deformation characteristics of subbase course materials to evaluate the mechanical behavior of granular base in cold regions. A series of resilient modulus tests on...
<p> Development of the seismic design and the seismic countermeasures of the structures supporting railroad ballasted tracks are progressing; development of them for ballasted tracks is also required. In this study, we conducted small-scale model ...
T. Ishikawa, S. Matsutani, T. Tokoro, T. Nakamura, Y. Momoya
Bearing Capacity of Roads, Railways and Airfields - Proceedings of the 10th International Conference on the Bearing Capacity of Roads, Railways and Airfields, BCRRA 2017 1817-1825 Jan 2018
The rail corrugation on high rail often generates on ballast-less track, however its mechanism has been not known in detail yet. In this paper, first of all, we assumed that the track supporting stiffness under sleeper influenced the generation si...
Japanese Geotechnical Society Special Publication (Web) 5(2) 135‐140(J‐STAGE)-140 2017
<p>In seasonal cold regions like Hokkaido, the soil surface up to a shallow depth is frozen during the winter. An earthquake during the freezing period and thawing period may cause severe disasters i.e. slope failures induced by the combined effec...
Japanese Geotechnical Society Special Publication 2(46) 1619-1622 2016
Cyclic plastic deformation of subgrade and other engineered layers is generally not taken into account in the design of railway bridge transition zones, although the plastic deformation is the governing factor of frequent track deterioration. Actu...
Ishikawa Tatsuya, Kijiya Ippei, Tokoro Tetsuya, Sato Masaru
Japanese Geotechnical Society Special Publication 2(13) 531-536 2016
This paper presents numerical simulations on frost heave phenomenon observed at the earth structures and pavement structures using a coupled thermo-hydro-mechanical (THM) FE analysis, which can consider the change in deformation-strength character...
6th Japan-China Geotechnical Symposium, SJGS 2015 1(7) 5-10 Jan 2015
Slope instability issues due to freeze-thaw action, rainfall and seismicity are common in cold regions like Hokkaido. It is essential to study the varied impacts of temperature difference and infiltration due to rainfall on soil slope stability. T...
6th Japan-China Geotechnical Symposium, SJGS 2015 1(7) 11-16 Jan 2015
In Hokkaido, Japan, over 40% area has been covered by volcanic coarse-grained soils. Due to the extreme weather in Hokkaido, snowfall always reaches several meters. After winter, a large amount of snow melts into water simultaneously, and at the s...
Computer Methods and Recent Advances in Geomechanics - Proceedings of the 14th Int. Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014 415-420 Jan 2015
This study proposes a new numerical model to simulate the Thermo-Hydro-Mechanical (THM) behavior of saturated and unsaturated soils suffered from one-dimensional freeze-thawing. First, a coupledTHM FE analysis, which can consider the change in def...
Geomechanics from Micro to Macro - Proceedings of the TC105 ISSMGE International Symposium on Geomechanics from Micro to Macro, IS-Cambridge 2014 2 1415-1420 Jan 2015
This study examines the effect of freeze-thaw actions and wet-dry cycles on the particle crushability and water retentivity of volcanic coarse-grained soils. A series of slaking tests for a cylindrical specimen made of two volcanic coarse-grained ...
The aim of this study is to clarify strength characteristics of a subbase course material changed due to the degree of saturation and the strain rate. A series of monotonic triaxial compression tests was carried out under desired unsaturated and s...
Unsaturated Soils: Research and Applications - Proceedings of the 6th International Conference on Unsaturated Soils, UNSAT 2014 2 1189-1195 Jan 2014
The objective of this study is to propose a laboratory element test for evaluating the air-permeability of unsaturated soils subjected to freeze-thaw action and to examine the effects of freezethawing and moisture content on air-permeability of un...
Unsaturated Soils: Research and Applications - Proceedings of the 6th International Conference on Unsaturated Soils, UNSAT 2014 2 1709-1714 Jan 2014
The purpose of this study is to clarify the soils thermal conductivity dependency on water content. In this study, thermal conductivity tests were conducted for three types of soils under different moisture content using a thermal probe method. Wa...
Japanese Geotechnical Society Special Publication 1(1) 1-20 2015
This study examines the mechanism of the geohazards occurred at a volcanic soil slope in cold regions and its influencing factors in consideration of the effects of freeze-thaw actions on the physical properties, the water retention-permeability c...
Springer Series in Geomechanics and Geoengineering 3 143-148 Oct 2013
The objective of this study is to evaluate the effect of freeze-thaw action on the strength and water retention-permeability characteristics of crushable volcanic coarse-grained soils in unsaturated conditions. A series of triaxial compression tes...
T. Kawaguchi, D. Nakamura, S. Yamashita, S. Yamasaki, T. Ishikawa
18th International Conference on Soil Mechanics and Geotechnical Engineering: Challenges and Innovations in Geotechnics, ICSMGE 2013 1 357-360 Jan 2013
In cold and snowy areas, surface soils on slopes often move downward especially in early spring. Its moving caused by repeated freeze-thaw cycles. If we properly evaluate slope stabilities and carry out effective slope protection works, we should ...
Springer Series in Geomechanics and Geoengineering 501-506 Jan 2013
The objective of this paper is to examine the influences of moisture content, loading speed, and degree of compaction on the shear behavior of compacted sandy soil under unsaturated conditions. A series of triaxial compression tests with various e...
T. Ishikawa, Y. Zhang, S. Kawabata, S. Kameyama, T. Tokoro, T. Ono
18th International Conference on Soil Mechanics and Geotechnical Engineering: Challenges and Innovations in Geotechnics, ICSMGE 2013 2 1287-1290 Jan 2013
This paper examines the effects of freeze-Thaw and water content on the deformation-strength properties of subbase course materials to evaluate the mechanical behavior of granular base in cold regions. CBR tests of freeze-Thawed subbase course mat...
5th Asia-Pacific Conference on Unsaturated Soils 2012 2 516-521 Nov 2012
This research paper proposes a new testing method to determine cyclic deformation characteristics of unsaturated granular material, and accordingly examines the effect of moisture content under moving wheel loads. A series of laboratory element te...
T. Ishikawa, Y. Zhang, H. Segawa, S. Miura, T. Tokoro
Advances in Transportation Geotechnics II - Proceedings of the 2nd International Conference on Transportation Geotechnics, ICTG 2012 534-540 Oct 2012
This paper proposes a testing method for evaluating the effect of water content on the deformation-strength characteristics of unsaturated base course materials. A medium-size triaxial apparatus for unsaturated soils was newly developed in order t...
In order to examine the applicability of L-shaped drainage method in in-situ in this study, the full-scale model test was performed. As a result, the excellent effect on the applicability to the reinforced soil retaining wall of L-shaped drainage ...
In this study, we proposed new testing methods for the evaluation of the deformation-strength characteristics of base course materials subjected to freeze-thaw action, and examined the mechanical behavior of granular base before and after freeze-t...
We elucidated the interaction between various factors which caused subsurface failure of volcanic soil ground subjected to freeze-thaw action in cold regions in terms of soil mechanics, and we proposed a new simple prediction method for the rain-i...
This study examines the mechanical behavior of granular materials under saturated and unsaturated conditions subjected to cyclic moving loads, for example gravel roadbed and railroad ballast, and both a new testing methods and new analytical proce...
Based on the experimental and numerical studies of slope stability of crushable soils, the following conclusions are obtained:1.Effect of freeze-thaw sequence on static mechanical behavior of volcanic soil(1)Particle breakage of volcanic coarse-gr...
This study examines the mechanical behavior of granular materials subjected to cyclic moving loads, for example gravel roadbed and railroad ballast, and both a new testing method and new analytical procedures to examine the effects of the rotation...
Study on dynamic stability characteristics of granular materials
