不同粒径砂土的细观离散元模拟  

Mesoscopic Simulations by the DEM Based on Different Sand Particle Diameters

作　　者：刘军[1] 孙田[1] 张豫湘[1] 章良兵[1] 

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044

出　　处：《北京建筑大学学报》2016年第4期18-22,共5页Journal of Beijing University of Civil Engineering and Architecture

基　　金：北京市自然科学基金项目(KZ201310016016)

摘　　要：基于离散元理论,建立砂土数值模型,并赋予颗粒微观参数进行三维数值模拟.通过大量的颗粒流数值试验,对颗粒微观参数进行调整,得到与室内三轴实验相一致的应力应变曲线.通过改变颗粒微观结构,结果表明颗粒直径对材料的宏观力学行为有比较明显的影响.实验突破室内常规三轴实验的局限性,揭示了微观规律,对以后的岩土工程的颗粒模拟提供了有价值的参考.Based on the theory of dimensional discrete element, models of sand were established, and the microscopic parameters of particles were given. Through a lot of tests of PFC models, the microscopic parameters of particles were adjusted and the curves of stress and strain consistent with triaxial test were obtained. By changing the particle microscopic parameters, the results show that the particle diameter has obvious influence on the macroscopic mechanical behavior of materials. The simulations break the limitations of conventional triaxial test, reveal the some microscopic regularity and provide a valuable reference for the future numerical simulation in geotechnical engineering.

关 键 词：三轴试验 离散元 颗粒级配 细观模拟 

分 类 号：TU411.6[建筑科学—岩土工程]