砂土力学性质的细观模拟  

Mesomechanical simulation of sand mechanical properties

作　　者：周健[1] 池永 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]浦东新区建设局,上海200135

出　　处：《岩土力学》2003年第6期901-906,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金项目资助(编号:50178054);上海市重点学科建设项目资助。

摘　　要：基于颗粒流理论,对砂土的室内双轴试验和砂土剪切带形成与发展进行了数值模拟,基本再现了砂土试样应力-应变关系。主要研究了颗粒粒径、颗粒摩擦系数等细观参数变化时试样宏观性质的变化情况。对比分析了室内试验和颗粒流数值模拟试验的砂土剪切带特征。同时对比研究了模型试样颗粒粒径、颗粒刚度和摩擦系数等细观参数的变化,对剪切带的形成与发展过程的影响。结果表明:通过颗粒流数值模型试验可以有效模拟砂土剪切带的形成与发展机理。Based on the theory of Particle Flow Code (PFC), the biaxial test and shear-band evolution of sand are simulated . The macro stress-strain relation of sand is reproduced by PFC model. The variation rules of macro properties of the sand sample with micro parameters, such as particle size and friction coefficient of particle, are studied. The results of sand shear-band in lab test are compared with PFC model, and the efffect of micro parameters, such as particle size, stiffness and friction coefficient, to the formation and extension process of the shear-band is analyzed. It is shown that the mechanism of sand shear-band can be simulated perfectly by PFC model.

关 键 词：砂土 力学性质 细观力学 颗粒流 应力-应变关系 剪切带 数值模拟 

分 类 号：TU441.5[建筑科学—岩土工程]