膨胀的
主应力
微尺度化学
岩土工程
压力(语言学)
材料科学
离散元法
平面应力
应力路径
机械
变形(气象学)
结构工程
有限元法
地质学
可塑性
剪应力
工程类
数学
复合材料
物理
数学教育
哲学
语言学
作者
Gang Ma,Xiaolin Chang,Wei Zhou,Tang-Tat Ng
出处
期刊:Geomechanics and Engineering
[Techno-Press]
日期:2014-09-01
卷期号:7 (3): 317-333
被引量:14
标识
DOI:10.12989/gae.2014.7.3.317
摘要
The study of the mechanical behavior of rockfill materials under three-dimensional loading conditions is a current research focus area. This paper presents a microscale numerical study of rockfill deformation and strength characteristics using the Combined Finite-Discrete Element Method (FDEM). Two features unique to this study are the consideration of irregular particle shapes and particle crushability. A polydisperse assembly of irregular polyhedra was prepared to reproduce the mechanical behavior of rockfill materials subjected to axial compression at a constant mean stress for a range of intermediate principal stress ratios in the interval [0, 1]. The simulation results, including the stress-strain characteristics, relationship between principal strains, and principal deviator strains are discussed. The stress-dilatancy behavior is described using a linear dilatancy equation with its material constants varying with the intermediate principal stress ratio. The failure surface in the principal stress space and its traces in the deviatoric and meridian plane are also presented. The modified Lade-Duncan criterion most closely describes the stress points at failure.
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