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Calculation and analysis of bearing capacity reliability index of post-grouting pile 后注浆桩承载力可靠度指标的计算与分析
Japanese Geotechnical Society Special Publication Pub Date : 2020-03-14 DOI: 10.3208/jgssp.v08.c30
Zhang Zhitong, W. Gong, Guoliang Dai
{"title":"Calculation and analysis of bearing capacity reliability index of post-grouting pile","authors":"Zhang Zhitong, W. Gong, Guoliang Dai","doi":"10.3208/jgssp.v08.c30","DOIUrl":"https://doi.org/10.3208/jgssp.v08.c30","url":null,"abstract":"The bearing capacity of bored piles is significantly improved and the dispersion of bearing capacity is reduced obviously by employing the method of grouting. However, there is still a lack of systematic research on the calculation and analysis of the reliability index of post-grouting pile. In this paper, the static load test data of 152 non-grouted bored piles and 113 post-grouted bored piles are collected. The influence of factors such as safety factor K , types of load effect combination, and the pile diameter are taken into account. Then, the approximate probability method based on the first-order second-moment method (JC method) and Monte Carlo method is employed to analyze the reliability indexes of post-grouted bored piles and non-grouted ones.","PeriodicalId":283909,"journal":{"name":"Japanese Geotechnical Society Special Publication","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129729941","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}
引用次数: 0
Quantification of pore volume and degree of saturation in partially saturated sands with different bulk density 不同容重的部分饱和砂岩孔隙体积和饱和度定量研究
Japanese Geotechnical Society Special Publication Pub Date : 2020-03-14 DOI: 10.3208/jgssp.v08.j19
Ryunosuke Kido, Y. Higo
{"title":"Quantification of pore volume and degree of saturation in partially saturated sands with different bulk density","authors":"Ryunosuke Kido, Y. Higo","doi":"10.3208/jgssp.v08.j19","DOIUrl":"https://doi.org/10.3208/jgssp.v08.j19","url":null,"abstract":"In the present study, water retention tests on Toyoura sand with high bulk density and low bulk density are conducted. Three-phase microstructures in sand specimens are visualized using an x-ray micro tomography at the different water retention states. Distributions of the degree of saturation in each pore are quantified using a segmentation technique and a Voronoi tessellation technique. The pore-scale distribution of degree of saturation in partially saturated sands with different bulk density and its variation during drying and wetting processes are discussed.","PeriodicalId":283909,"journal":{"name":"Japanese Geotechnical Society Special Publication","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129790600","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}
引用次数: 1
Quality identification of chemical grouting improvement by electrical logging 电测井化学注浆改造质量鉴定
Japanese Geotechnical Society Special Publication Pub Date : 2020-03-14 DOI: 10.3208/jgssp.v08.j01
Yukiakira Hanada, Yasutoshi Ohno, Takayoshi Ito, K. Shimosaka, M. Akatsuka, Y. Murata, K. Kariya, Kazuna Yubuki, A. Yashima
{"title":"Quality identification of chemical grouting improvement by electrical logging","authors":"Yukiakira Hanada, Yasutoshi Ohno, Takayoshi Ito, K. Shimosaka, M. Akatsuka, Y. Murata, K. Kariya, Kazuna Yubuki, A. Yashima","doi":"10.3208/jgssp.v08.j01","DOIUrl":"https://doi.org/10.3208/jgssp.v08.j01","url":null,"abstract":"The chemical grouting improvement is one of the typical countermeasures against liquefaction during an earthquake. The quality of the improved ground is usually identified by the uniaxial compressive strength. However, the sample disturbance is likely to occur during sampling because the target strength of the improvement body is relatively low. Therefore, it is very difficult to grasp a characteristic change before and after the improvement. In this study, we focused on the change in electric resistivity in addition to the uniaxial compressive strength as a quality identification. The effectiveness of quality identification using electric resistivity was confirmed by metal barrel model experiments and a field test.","PeriodicalId":283909,"journal":{"name":"Japanese Geotechnical Society Special Publication","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125692773","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}
引用次数: 0
Development of rock fracturing model considering mineral composition and distribution and its application to coupled Thermal-Hydraulic-Mechanical-Chemical (THMC) simulator 考虑矿物组成和分布的岩石压裂模型的建立及其在热-水力-机械-化学(THMC)耦合模拟器中的应用
Japanese Geotechnical Society Special Publication Pub Date : 2020-03-14 DOI: 10.3208/jgssp.v08.j45
K. Kishida, Shogo Izawa, S. Ogata, H. Yasuhara
{"title":"Development of rock fracturing model considering mineral composition and distribution and its application to coupled Thermal-Hydraulic-Mechanical-Chemical (THMC) simulator","authors":"K. Kishida, Shogo Izawa, S. Ogata, H. Yasuhara","doi":"10.3208/jgssp.v08.j45","DOIUrl":"https://doi.org/10.3208/jgssp.v08.j45","url":null,"abstract":"A numerical simulation model, considering the distribution of minerals in intact rock, was proposed to predict the tensile strength as well as the processes for generating and propagating a fracture in radial compression tests. The objective rock sample was modeled by considering the mineral distribution obtained through an image analysis. The proposed model accurately estimated the tensile strength and the tensile stress-vertical strain relation. In addition, using the damage variable, the generation and propagation of the fracture were also estimated by the proposed model.","PeriodicalId":283909,"journal":{"name":"Japanese Geotechnical Society Special Publication","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130573937","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}
引用次数: 0
An elasto-viscoplastic model for frozen-unfrozen clays for combined problems of temperature and load variations 考虑温度和荷载变化的冻土区-非冻土区弹粘塑性模型
Japanese Geotechnical Society Special Publication Pub Date : 2020-03-14 DOI: 10.3208/jgssp.v08.j06
Ke Chen, S. Nishimura, Yu Nagai
{"title":"An elasto-viscoplastic model for frozen-unfrozen clays for combined problems of temperature and load variations","authors":"Ke Chen, S. Nishimura, Yu Nagai","doi":"10.3208/jgssp.v08.j06","DOIUrl":"https://doi.org/10.3208/jgssp.v08.j06","url":null,"abstract":"Frozen soil’s mechanical behavior is characterized by interactions between solid grains, ice and unfrozen water. It is strongly affected by temperature and ice content, indicating pronounced differences between frozen and unfrozen soils. Rate-sensitive behavior of frozen soil is expected, given the highly rate-dependent behavior of ice. The consequence is reflected in the peculiar features seen in frozen soil’s strength and deformation characteristics under transient temperature and load. To capture these features, an elasto-viscoplastic constitutive model for estimating temperature-and strain rate-dependent behavior of water-saturated clays is presented that is applicable continuously to both frozen and unfrozen states. This model adopts the p’:q plane with a Critical State Line (CSL) that moves with temperature and strain rate while converging to a unique unfrozen CSL, thus it is seamlessly continuous to a conventional elasto-viscoplastic critical state model in unfrozen states. This model is based on an isotach over-stress approach with the cryogenic suction as additional state variable, and is potentially capable of describing varying-load and varying-temperature behaviour seen under combined influence of these two factors.","PeriodicalId":283909,"journal":{"name":"Japanese Geotechnical Society Special Publication","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127891429","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}
引用次数: 0
Study on reduction of hexavalent chromium elution from cement-improved soil 水泥改良土壤中六价铬洗脱量的减少研究
Japanese Geotechnical Society Special Publication Pub Date : 2020-03-14 DOI: 10.3208/jgssp.v08.j42
K. Shibata, Kensuke Yamaya, H. Yoshida, Y. Suenaga, S. Okazaki, Naomichi Matsumoto
{"title":"Study on reduction of hexavalent chromium elution from cement-improved soil","authors":"K. Shibata, Kensuke Yamaya, H. Yoshida, Y. Suenaga, S. Okazaki, Naomichi Matsumoto","doi":"10.3208/jgssp.v08.j42","DOIUrl":"https://doi.org/10.3208/jgssp.v08.j42","url":null,"abstract":"Hexavalent chromium may elute from a part of cement-improved soils when cement solidifications are used for the purpose of ground improvement. Particularly, the likelihood of elution increases when the type of soil is volcanic cohesive soil. Hexavalent cohesive chromium is extremely toxic to the human body. Therefore, in the above-mentioned cement solidifications, it is recommended to consider its elution when volcanic soil is used. In this study, strength and dissolution tests of hexavalent chromium are conducted on cement-improved soils in which cement solidifications and andosols are mixed. Three different waste materials (sugar syrup, burned fish bone, and rice husk ash) are used to verify their reduction properties for hexavalent chromium. According to the results of the test, the strengths of the specimens with the three different materials do not change significantly, and the improved soils maintain the required strengths. In addition, the elution amount of hexavalent chromium from the specimen mixed with a sugar syrup is lower than that from an unmixed specimen. This fact suggests that the waste syrup can reduce the elution of hexavalent chromium.","PeriodicalId":283909,"journal":{"name":"Japanese Geotechnical Society Special Publication","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129287983","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}
引用次数: 0
Water movement in unsaturated multi-layered slope under heavy rainfall conditions in wetting and dry process 干湿过程中强降雨条件下非饱和多层边坡水分运动
Japanese Geotechnical Society Special Publication Pub Date : 2020-03-14 DOI: 10.3208/jgssp.v08.j26
Junfeng Tang, T. Uchimura, Shangning Tao, T. Toda
{"title":"Water movement in unsaturated multi-layered slope under heavy rainfall conditions in wetting and dry process","authors":"Junfeng Tang, T. Uchimura, Shangning Tao, T. Toda","doi":"10.3208/jgssp.v08.j26","DOIUrl":"https://doi.org/10.3208/jgssp.v08.j26","url":null,"abstract":"In 2013, a number of shallow landslides triggered by heavy rainfall affected a mountainous area which located on Izu-Oshima island (Eastern Japan). These slopes are consist of fine soil layers and coarse soil layers which have different permeability coefficient and soil water characteristic curves. To clarify the characteristics of water infiltration in such unsaturated multi-layered slope and to assess the influence of the water content distribution on slope failure, 4 groups of slope model experiments were conducted. Silica No 1(D50=3.10 mm) and silica No 7(D50=0.16 mm) were used as the slope materials. The results indicated that wetting front apparently stopped at the interface between the silica No 7 layer and silica No 1 since the capillary barrier works and then lateral water flow occurred along with the interface and infiltrate into next layer when soil approaches saturation. It was found that lower water content in fine and coarse layer, unsaturated permeability coefficient K in coarse layer (5.54E-06 cm/s) is smaller than fine layer (1.08E-04 cm/s) since matric suction is 2.5 kPa, which result that capillary barrier works. In addition, higher water zone still exists at the bottom of the fine layer after drainage for a long period which results in the failure in this zone firstly when second rainfall was applied. Piping occurred at the bottom of the model when amount of water exists inside the slope.","PeriodicalId":283909,"journal":{"name":"Japanese Geotechnical Society Special Publication","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122257215","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}
引用次数: 0
Deformation of granular soil under combination of principal stress value and direction change 主应力值与方向变化联合作用下颗粒土的变形
Japanese Geotechnical Society Special Publication Pub Date : 2020-03-14 DOI: 10.3208/jgssp.v08.c40
Zhangming He, Longqi Xue, Rui Wang, Jian-Min Zhang
{"title":"Deformation of granular soil under combination of principal stress value and direction change","authors":"Zhangming He, Longqi Xue, Rui Wang, Jian-Min Zhang","doi":"10.3208/jgssp.v08.c40","DOIUrl":"https://doi.org/10.3208/jgssp.v08.c40","url":null,"abstract":"Soil is often subjected to complex three-dimensional stress paths in geotechnical engineering. It is difficult to achieve such complex stress paths in laboratory tests. To this means, discrete element numerical simulations are carried out on cross-anisotropic granular material by using PFC3D in this study. The response of granular soil under three-dimensional seismic load is simulated and compared with results from corresponding pure principal stress magnitude change or direction change scenarios, illustrating the importance of principal stress value and direction combination on the mechanical behavior of soil. Simulations of three kinds of idealized stress paths are then conducted and discussed. In the idealized stress path simulations, the deformation and micro-scale fabric evolution is observed to be most significant under pure direction change.","PeriodicalId":283909,"journal":{"name":"Japanese Geotechnical Society Special Publication","volume":"33 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125713889","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}
引用次数: 0
A constitutive model related to the fabric for sand 砂土结构的本构模型
Japanese Geotechnical Society Special Publication Pub Date : 2020-03-14 DOI: 10.3208/jgssp.v08.c24
Xuefeng Li, Weinan Lu, Zhigang Ma
{"title":"A constitutive model related to the fabric for sand","authors":"Xuefeng Li, Weinan Lu, Zhigang Ma","doi":"10.3208/jgssp.v08.c24","DOIUrl":"https://doi.org/10.3208/jgssp.v08.c24","url":null,"abstract":"","PeriodicalId":283909,"journal":{"name":"Japanese Geotechnical Society Special Publication","volume":"49 7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122744859","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}
引用次数: 0
Effect of reinforcement spacing on the performance of bridge abutment by scaled model test 通过比例模型试验研究配筋间距对桥台性能的影响
Japanese Geotechnical Society Special Publication Pub Date : 2020-03-14 DOI: 10.3208/jgssp.v08.c55
Yang Yang, Chao Xu, Min Luo
{"title":"Effect of reinforcement spacing on the performance of bridge abutment by scaled model test","authors":"Yang Yang, Chao Xu, Min Luo","doi":"10.3208/jgssp.v08.c55","DOIUrl":"https://doi.org/10.3208/jgssp.v08.c55","url":null,"abstract":"Recently, construction of GRS (Geosynthetic reinforced soil) structures with closely spaced layers of geosynthetic reinforcement has been increased significantly. In order to achieve direct comparison between GRS structures and the conventional mechanically stabilized earth structures using geosynthetic (GMSE) under the same working condition, three model tests with a bridge abutment as a prototype were designed in this research. Under the vertical load of 100 kPa in simulating the weight of the bridge deck, important parameters such as stresses and deformations of the model abutment were measured, and the effect of reinforcement spacing on the performance of different reinforced soil structures was evaluated. According the test results, the overall better performance of GRS abutment was proved in terms of measured strains and stresses. In addition, comparisons were made between the measurements and the analytical predictions following solutions available in literature, and the accuracy as well as limitations of different calculation methods was discussed.","PeriodicalId":283909,"journal":{"name":"Japanese Geotechnical Society Special Publication","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130915646","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}
引用次数: 1
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