岩土力学2013，Vol.34Issue(2)：395-403,9.
砂性土成拱应力释放特性的模型试验及数值模拟研究
Stress release characteristics of sandy soil arching by laboratory tests and numerical simulation
摘要
Abstract
The influence of unloading magnitude and porosity on stress release characteristics of sandy soil arching is analyzed by laboratory tests. Meso-study is also performed by PFC2D, the further study is focused on effect of particle friction property, stress and displacement field variation and stress release section division during arching. The results show: (1) The results of unloading magnitude effect by PFC2D agree well with laboratory tests; it's feasible to study stress release characteristics of sandy soil by PFC2D. (2) The vertical stress release in stress release section is larger than that in stress increase section, while horizontal stress release is not; the lateral pressure coefficient increases as getting closer to the unloading site in stress release section while the regularity is reversed in stress increase section. (3) The friction property of sandy soil reduces the influence of arching on stress release and lateral pressure coefficient. (4) The stress release factor increases as unloading magnitude or porosity increases; the lateral pressure coefficient increases in stress release section while decreases in stress increase section as unloading magnitude or porosity increases.关键词
砂性土/离散元/应力释放/土拱效应/侧压力系数Key words
sandy soil/ discrete elements/ stress release/ soil arching effect/ lateral pressure coefficient分类
数理科学引用本文复制引用
贾剑,周顺华,宫全美..砂性土成拱应力释放特性的模型试验及数值模拟研究[J].岩土力学,2013,34(2):395-403,9.基金项目
国家自然科学基金资助项目(No.50878151). （No.50878151）
