期刊论文

Study on mechanical properties and mesoscopic simulation of coarse-grained soil subgrade

He, Zhongming(hezhongming45@126.com)

中文

中南大学学报(自然科学版)

1672-7207

2020

51

4

1116-1124

10.11817/j.issn.1672-7207.2020.04.026

51978084:国家自然科学基金 51678073:国家自然科学基金 2015JJ6004:湖南省自然科学基金

本校为第一机构

为了研究粗粒土填料在荷载及降雨入渗作用下的力学特性变化规律,采用Autotriax全自动三轴试验系统对粗粒土填料进行静三轴试验。基于试验所得力学参数,结合颗粒流软件PFC3D对试验进行细观模拟研究,通过自编程序引入接触黏结模型,对比分析粗粒土在不同围压、含水率和压实度下的力学特性及变形规律。研究结果表明:运用PFC3D软件进行静三轴试验模拟,通过数值分析得到的应力-应变曲线变化趋势与室内试验结果变化趋势较一致;试件的体应变在高围压时表现为整体剪缩,低围压时表现为先剪缩后剪胀;随着应变增加,黏结断裂点快速发展,试件由单一的中间部位挤压呈现出多个潜在的剪切面,且颗粒间的黏结破坏具...

In order to study the variation of mechanical properties of coarse-grained soil under load and rainfall infiltration, Autotriax fully automatic triaxial test system was used to conduct static triaxial test on coarse-grained soil filler. Based on the parameter of test, the mesoscopic simulation of triaxial test was carried out with particle flow software PFC3D. Contact bond model was introduced by self-programming, the mechanical properties and variation of coarse-grained soil under different confining pressures, moisture contents and degrees of...