颗粒流模拟土的工程特性(英文)

Simulation of soil properties by particle flow code

摘要: 本文基于颗粒流理论,引入不同的颗粒接触连接本构模型,分别建立了砂土和粘性土的颗粒流模型。通过颗粒流数值模型试验,从细观力学角度对土的工程力学特性作了初步的研究。对砂土和粘性土的室内平面应变试验及其剪切带形成和发展进行了数值模拟,分别对比了不同围压下颗粒流试样与室内试验的应力应变关系曲线,基本再现了砂土和粘性土试样应力-应变关系。通过分析围压-时步曲线、体变曲线和不同阶段的颗粒位移场的变化规律,研究了剪切带的形成与发展规律。

Abstract: Based on the theory of particle flow,Particle Flow Code(PFC)model of sand and clay were constituted respectively by adopting the different particle contact constitutive relationships.Preliminary study on mechanical properties of soil was done by PFC numerical simulation.The plane strain tests of sand and clay,and the emergence and development of shear bands were simulated numerically by PFC to analyze the stress-strain relationship curves of PFC models and test results under different confining pressures.The development of shear band was researched by analyzing the confining pressure-time history,volumetric curve and displacement field of PFC model.