基于离散元理论的土石混合料剪切特性研究  

Study shear behavior of soil-rock mixture based on discrete element method

作　　者：王锋 

机构地区：[1]广西长长路桥建设有限公司,广西南宁530000

出　　处：《河南理工大学学报（自然科学版）》2017年第3期131-136,共6页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(51408086)

摘　　要：为研究土石混合料的剪切特征,采用离散元理论建立土石混合料的双轴模型,对土石混合料在不同含石率、不同荷载条件下的剪切特性进行研究,引入傅里叶级数近似法,探讨混合料内部强力链和弱力链的细观组成的分布规律。结果表明:随着含石量增加,土石混合料的抗剪强度增大,剪胀性增强;混合料内部起主要承载作用的是强力链;同时,确定不同含石量下土石混合料的内摩擦角的宏观对应曲线。In order to study shear behavior of soil-rock mixture, biaxial models of soil-rock mixture are estab-lished by PFC2D based on discrete element method theory to analyz shear behavior of soil-rock mixture with dif-ferent conditions of load and rock content, and Fourier series is introduced to study distribution law of fabric in strong and weak force chains. The results show that the shear strength and dilatancy behavior of soil-rock mix-ture increase with the increase of rock content, strong force chains play a vital role to bear axial load, finally frictional angle values of soil-rock mixture with different rock content are confirmed by a series of biaxial test.

关 键 词：土石混合料 离散元 双轴试验 含石量 傅里叶级数 

分 类 号：TU528.1[建筑科学—建筑技术科学]