Pub Date : 1900-01-01DOI: 10.2208/jscejge.77.4_360
Y. Kohmura
{"title":"A STUDY ON CLASS II CHARACTERISTICS OF INADA GRANITE UNDER UNI-AXIAL COMPRESSIVE STRESS","authors":"Y. Kohmura","doi":"10.2208/jscejge.77.4_360","DOIUrl":"https://doi.org/10.2208/jscejge.77.4_360","url":null,"abstract":"","PeriodicalId":326143,"journal":{"name":"Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130244340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Nakajima, A. Kudo, Hiroaki Narita, Kenji Watanabe
{"title":"EXPERIMENTAL STUDY ON EFFECT AND DESIGN METHODOLOGY OF ASEISMIC REINFORCEMENT FOR EXISTING LEANING TYPE RETAINING WALL","authors":"S. Nakajima, A. Kudo, Hiroaki Narita, Kenji Watanabe","doi":"10.2208/JSCEJGE.75.316","DOIUrl":"https://doi.org/10.2208/JSCEJGE.75.316","url":null,"abstract":"","PeriodicalId":326143,"journal":{"name":"Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121743441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.2208/jscejge.77.4_371
Ryohei Sugii, M. Yamazaki, S. Akutagawa
{"title":"STUDY OF FEM ANALYSIS MODEL OF A SLOPE WITH GROUND ANCHORS AND A PREDICTION METHOD OF LOAD INCREASE BY CUTTING","authors":"Ryohei Sugii, M. Yamazaki, S. Akutagawa","doi":"10.2208/jscejge.77.4_371","DOIUrl":"https://doi.org/10.2208/jscejge.77.4_371","url":null,"abstract":"","PeriodicalId":326143,"journal":{"name":"Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130841638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
It has been recognized that gas hydrate-bearing sediments clearly exhibit time-dependent behavior such as long-term consolidation, strain rate dependency, and creep deformation due to its viscoplasticity of gas hydrates. The main objective of the present study is to understand the time-dependent behavior of gas-hydrate-bearing sediments by a series of experiment and to establish a constitutive equation that can de-scribe the time-dependent behavior of gas-hydrate-bearing soils. First, a series of undrained triaxial compression tests with step-changed strain rate is conducted on synthetic CO 2 -hydrate-bearing sand specimens in order to investigate the strain rate dependency of the hydrate-bearing soils. Second, the elasto-viscoplastic constitutive equation has been developed based on the obtained experimental results. The proposed model is then applied to the experimental results to find that the model can reproduce the mechanical behavior of the CO 2 -hydrate-bearing specimens. The main findings obtained from the present study are as follows: First, the unique stress-strain-strain rate relations, namely, Isotaches, is observed for both the CO 2 -hydrate-bearing sand specimens and the sand sample without hydrates. In addition, the CO 2 -hydrate-bearing specimens clearly show the strain rate dependency, and it increases with increase in the hydrate saturation. Second, from the experimental results, it is found that dependency of hydrate saturation on both the strength and the stiffness does not appear in the case where the strain rate is quite slow. This is because the strength of the CDH-bearing sediments may be determined by the balance of the hardening effect and viscoplasticity of the hydrates. In the case of the slow strain rate, the viscoplasticity is more dominant on the mechanical behavior of the CDH-bearing sand than the hardening effect. The proposed constitutive model can well express those mechanical responses of the CO 2 -hydrate-bearing specimens by introducing the effect
{"title":"TIME-DEPENDENT BEHAVIOR OF CO2-HYDRATE-BEARING SEDIMENTS AND APPLICATION OF ELASTO-VISCOPLASTIC CONSTITUTIVE MODEL","authors":"Hiromasa Iwai, Y. Konishi, S. Kimoto","doi":"10.2208/JSCEJGE.75.273","DOIUrl":"https://doi.org/10.2208/JSCEJGE.75.273","url":null,"abstract":"It has been recognized that gas hydrate-bearing sediments clearly exhibit time-dependent behavior such as long-term consolidation, strain rate dependency, and creep deformation due to its viscoplasticity of gas hydrates. The main objective of the present study is to understand the time-dependent behavior of gas-hydrate-bearing sediments by a series of experiment and to establish a constitutive equation that can de-scribe the time-dependent behavior of gas-hydrate-bearing soils. First, a series of undrained triaxial compression tests with step-changed strain rate is conducted on synthetic CO 2 -hydrate-bearing sand specimens in order to investigate the strain rate dependency of the hydrate-bearing soils. Second, the elasto-viscoplastic constitutive equation has been developed based on the obtained experimental results. The proposed model is then applied to the experimental results to find that the model can reproduce the mechanical behavior of the CO 2 -hydrate-bearing specimens. The main findings obtained from the present study are as follows: First, the unique stress-strain-strain rate relations, namely, Isotaches, is observed for both the CO 2 -hydrate-bearing sand specimens and the sand sample without hydrates. In addition, the CO 2 -hydrate-bearing specimens clearly show the strain rate dependency, and it increases with increase in the hydrate saturation. Second, from the experimental results, it is found that dependency of hydrate saturation on both the strength and the stiffness does not appear in the case where the strain rate is quite slow. This is because the strength of the CDH-bearing sediments may be determined by the balance of the hardening effect and viscoplasticity of the hydrates. In the case of the slow strain rate, the viscoplasticity is more dominant on the mechanical behavior of the CDH-bearing sand than the hardening effect. The proposed constitutive model can well express those mechanical responses of the CO 2 -hydrate-bearing specimens by introducing the effect","PeriodicalId":326143,"journal":{"name":"Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134614063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"EVALUATION OF RELATIONSHIP BETWEEN LOAD CELL INSTALLED ON GROUND ANCHOR AND DISPLACEMENT SENSOR","authors":"M. Yamazaki, T. Sakai","doi":"10.2208/JSCEJGE.75.288","DOIUrl":"https://doi.org/10.2208/JSCEJGE.75.288","url":null,"abstract":"","PeriodicalId":326143,"journal":{"name":"Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116538145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yoshihiro Tsunekawa, T. Sakai, H. Miyatake, M. Kondoh
{"title":"BENDING DEFLECTION OF A GROUND ANCHOR FOLLOWING A LANDSLIDE","authors":"Yoshihiro Tsunekawa, T. Sakai, H. Miyatake, M. Kondoh","doi":"10.2208/jscejge.78.2_96","DOIUrl":"https://doi.org/10.2208/jscejge.78.2_96","url":null,"abstract":"","PeriodicalId":326143,"journal":{"name":"Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129098059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
As a cause of the seismic damage to embankments, liquefaction of the sandy ground located under an embankment has been mainly focused in the past. However, many embankment damages were observed also in river levees constructed on non-liquefiable ground, in which thick clay and/or peat layers were de-posited, during the 2011 off the Pacific coast of Tohoku Earthquake. In this research, to investigate the dynamic deformation mechanism of an embankment constructed on a clay deposit which received a consolidation history, a series of shaking table tests in a centrifugal field were carried out by changing the consolidation state (i.e., normal consolidation or overconsolidation) of the clay deposit under an embankment, the embankment material, and the input level of an earthquake motion. The experiments have revealed that an embankment constructed on a normally-consolidated clay deposit and affected by the consolidation settlement showed a larger seismic damage compared to that on an overconsolidated clay deposit, although the embankment settlement due to the earthquake loading was smaller than that arising from the consolidation settlement of the normally-consolidated clay. This suggests that the stress state within the embankment changed from its initial state immediately after the construction of the embankment due to the consolidation settlement of the clay deposit. To estimate the seismic damage of an embankment constructed on a clay deposit, it is thought that the influence evaluation of the consolidation history in the clay deposit becomes important.
{"title":"CENTRIFUGE MODEL TESTS ON THE SEISMIC STABILITY OF EMBANKMENT CONSTRUCTED ON CLAY DEPOSITS SUBJECTED TO CONSOLIDATION HISTORY","authors":"K. Ueda, Takayuki Ashino, S. Iai","doi":"10.2208/JSCEJGE.75.234","DOIUrl":"https://doi.org/10.2208/JSCEJGE.75.234","url":null,"abstract":"As a cause of the seismic damage to embankments, liquefaction of the sandy ground located under an embankment has been mainly focused in the past. However, many embankment damages were observed also in river levees constructed on non-liquefiable ground, in which thick clay and/or peat layers were de-posited, during the 2011 off the Pacific coast of Tohoku Earthquake. In this research, to investigate the dynamic deformation mechanism of an embankment constructed on a clay deposit which received a consolidation history, a series of shaking table tests in a centrifugal field were carried out by changing the consolidation state (i.e., normal consolidation or overconsolidation) of the clay deposit under an embankment, the embankment material, and the input level of an earthquake motion. The experiments have revealed that an embankment constructed on a normally-consolidated clay deposit and affected by the consolidation settlement showed a larger seismic damage compared to that on an overconsolidated clay deposit, although the embankment settlement due to the earthquake loading was smaller than that arising from the consolidation settlement of the normally-consolidated clay. This suggests that the stress state within the embankment changed from its initial state immediately after the construction of the embankment due to the consolidation settlement of the clay deposit. To estimate the seismic damage of an embankment constructed on a clay deposit, it is thought that the influence evaluation of the consolidation history in the clay deposit becomes important.","PeriodicalId":326143,"journal":{"name":"Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131915496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.2208/jscejge.76.3_295
D. Ito, H. Komine
In the high-level radioactive waste geological disposal, bentonite buffer material will be keeping exposed to complex environmental of high pressure and high temperature. Therefore, bentonite buffer material will be consolidated and its physical properties such as swelling and permeability will be changed. In this study, the authors thought that bentonite raw ore, consolidated in the natural ground, will have similar properties of consolidated buffer material. Three sodium type bentonite ore were choosen whose mined places and age were different. For experimental evaluation of influence of cementation on swelling properties, the authors made undisturbed and reconstituted specimens, and conducted swelling pressure and one-dimen-sional swelling deformation tests. As a result, for the undisturbed specimens, it was tended to have lower swelling properties than the reconstituted specimens by the effect of cementation. Also, the swelling properties tended to decline as the geological age of the ores was older.
{"title":"EVALUATING INFLUENCE OF CEMENTATION ON SWELLING PROPERTIES OF BENTONITE BUFFER MATERIAL BASED ON THE RESULTS OF BENTONITE ORES","authors":"D. Ito, H. Komine","doi":"10.2208/jscejge.76.3_295","DOIUrl":"https://doi.org/10.2208/jscejge.76.3_295","url":null,"abstract":"In the high-level radioactive waste geological disposal, bentonite buffer material will be keeping exposed to complex environmental of high pressure and high temperature. Therefore, bentonite buffer material will be consolidated and its physical properties such as swelling and permeability will be changed. In this study, the authors thought that bentonite raw ore, consolidated in the natural ground, will have similar properties of consolidated buffer material. Three sodium type bentonite ore were choosen whose mined places and age were different. For experimental evaluation of influence of cementation on swelling properties, the authors made undisturbed and reconstituted specimens, and conducted swelling pressure and one-dimen-sional swelling deformation tests. As a result, for the undisturbed specimens, it was tended to have lower swelling properties than the reconstituted specimens by the effect of cementation. Also, the swelling properties tended to decline as the geological age of the ores was older.","PeriodicalId":326143,"journal":{"name":"Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128818754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.2208/jscejge.77.3_314
Y. Takeshita, Manami Miki, Yuijun Ikeda
{"title":"FIELD TECHNIQUE FOR MEASURING FIELD SATURATED HYDRAULIC CONDUCTIVITY BY USING SIMPLIFIED FALLING HEAD PERMEABILITY TEST BASED ON GUELPH PRESSURE INFILTROMETER","authors":"Y. Takeshita, Manami Miki, Yuijun Ikeda","doi":"10.2208/jscejge.77.3_314","DOIUrl":"https://doi.org/10.2208/jscejge.77.3_314","url":null,"abstract":"","PeriodicalId":326143,"journal":{"name":"Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)","volume":"1960 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129482688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
this to clarify the mechanical characteristics of “Tataki”, or artificial stone, made from waste of the siliceous tuff, a series of laboratory tests are carried out. The experiments involve unconfined compression test, bending test and needle penetration test. From the experimental results, the in-situ applicability of Tataki as geomaterials or civil engineering materials is discussed. The following conclusions are obtained from the present study: (1) Unconfined compressive strength of Tataki
{"title":"MECHANICAL CHARACTERISTICS OF TATAKI, OR ARTIFICIAL STONE, MADE FROM WASTE OF SILICEOUS TUFF AS GEOMATERIALS","authors":"H. Shigematsu","doi":"10.2208/jscejge.76.1_67","DOIUrl":"https://doi.org/10.2208/jscejge.76.1_67","url":null,"abstract":"this to clarify the mechanical characteristics of “Tataki”, or artificial stone, made from waste of the siliceous tuff, a series of laboratory tests are carried out. The experiments involve unconfined compression test, bending test and needle penetration test. From the experimental results, the in-situ applicability of Tataki as geomaterials or civil engineering materials is discussed. The following conclusions are obtained from the present study: (1) Unconfined compressive strength of Tataki","PeriodicalId":326143,"journal":{"name":"Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115346961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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