动态土工真三轴仪在砂土液化研究中的应用  

Application of dynamic true triaxial apparatus to study on sand liquefaction

作　　者：许成顺[1,2] 刘海强[1] 杜修力[1,2] 尹占巧[1] 

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]首都世界城市顺畅交通北京市协同创新中心,北京100124

出　　处：《岩土工程学报》2013年第10期1895-1900,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51278015);北京市教委重点项目(KZ201210005010);国家973计划项目课题(2011CB013600)

摘　　要：为了模拟实际场地中土体变形和强度特性,研究开发了揭示侧限条件下饱和砂土震动液化机理的试验方法。文中采用了动态真三轴试验系统,该设备采用刚性板加柔性面的混合边界加载装置,并应用先进的CATS试验控制系统。试验结果表明应用动态土工真三轴仪进行砂土液化实验是可行的,并初步分析了侧限条件下的液化机理,即土体将在轴向压力、侧压和孔隙水压力相等的条件下发生液化,表明振动荷载过程中的应力重分布对砂土液化强度和孔隙水压力发展等具有显著的影响。A test method is developed to simulate the deformation and strength characteristics of soils in real sites. This test method reveals the mechanism of seismic liquefaction of saturated sand under confined condition. A dynamic true triaxial test system is applied. This device provides mixed boundary conditions for samples and installation of advanced CATS test control system. The test results show that use of the dynamic true triaxial apparatus for sand liquefaction test research is feasible. Moreover, the mechanism of soil liquefaction under confined condition is investigated. Namely, the liquefaction will be generated when the axial and lateral pressures as well as the pore water pressure are equal to each other. It indicates that in the process of vibration load, the stress redistribution has a significant influence on the strength of sand liquefaction and the development mode of pore water pressure.

关 键 词：动态真三轴仪 砂土液化 侧限条件 孔隙水压力 

分 类 号：TU435[建筑科学—岩土工程]