| 含微生物气泡高饱和砂土循环三轴剪切CFD-DEM模拟 |
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| 引用本文： | 蒋明镜,沈振义,刘俊,杨涛,谭亚飞鸥.含微生物气泡高饱和砂土循环三轴剪切CFD-DEM模拟[J].西北地震学报,2021,43(2):353-360. |
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| 作者姓名： | 蒋明镜 沈振义 刘俊 杨涛 谭亚飞鸥 |
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| 作者单位： | 天津大学 建筑工程学院土木系, 天津 300072;天津大学 水利工程仿真与安全国家重点实验室, 天津 30007;同济大学 地下建筑与工程系, 上海 2000921;同济大学 土木工程防灾重点实验室, 上海 200092;上海理工大学 环境与建筑学院, 上海 200093 |
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| 基金项目： | 国家自然科学基金重大项目（51890911）；国家自然科学基金重点项目（51639008） |
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| 摘 要： | 为探究砂土液化的微观机理,根据室内试验中微生物反硝化反应气泡的生成速率,建立数值模拟的时效性关系,分别制取微生物处理0天、2天、3天和5天的高饱和砂土试样,采用CFD-DEM耦合方法模拟不同工况下砂土试样的循环三轴不排水剪切试验.依据砂土试样的力链分布、抗液化振次、孔压比、轴向应变和力学配位数在加载过程中的变化情况,从...
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| 关 键 词： | 微生物气泡 净砂 不排水循环三轴 液化 CFD-DEM耦合 |
| 收稿时间： | 2018/11/30 0:00:00 |
Cyclic Triaxial Shear Tests on Highly Saturated Sand Containing Microbial Bubbles with CFD-DEM Coupling Method |
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| JIANG Mingjing,SHEN Zhenyi,LIU Jun,YANG Tao,TAN Yafeiou.Cyclic Triaxial Shear Tests on Highly Saturated Sand Containing Microbial Bubbles with CFD-DEM Coupling Method[J].Northwestern Seismological Journal,2021,43(2):353-360. |
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| Authors: | JIANG Mingjing SHEN Zhenyi LIU Jun YANG Tao TAN Yafeiou |
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| Institution: | Department of Civil Engineering, School of Architectural Engineering, Tianjin University, Tianjin 300072, China;State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China;Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China |
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| Abstract: | To investigate the microscopic mechanism of sand liquefaction, this study proposes a time-effect relationship according to the generation rate of bubbles in indoor microbial denitrification test. Highly saturated sand samples were treated with microbiological method for 0, 2, 3, and 5 days. The samples were subjected to cyclic triaxial undrained shear tests by CFD-DEM coupling method under different working conditions. Changes in force chain distribution, vibration time, pore pressure ratio, axial strain, and mechanical coordination number of the samples during the load process were determined to study their liquefaction resistance. Numerical results show that the liquefaction resistance of the highly saturated sand samples containing microbial bubbles is higher than that of fully saturated sand. With increasing treatment time, the saturation degree of the samples decreases but their liquefaction resistance increases; moreover, the pore pressure ratio and axial strain increase slowly. |
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| Keywords: | microbial bubbles pure sand undrained cyclic triaxial test liquefaction CFD-DEM couplin |
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