摘要
采用颗粒流分析软件,对含有不同岩桥倾角的两条雁行预制裂隙岩样进行数值模拟.研究表明,当岩桥倾角为80°和90°时,在荷载作用下裂隙内外端有翼裂纹出现,同时次生裂纹在预制裂隙尖端出现,岩桥区域主要产生拉剪复合型的贯通;当岩桥倾角为120°时,随着荷载的增加,一条预制裂隙内端翼裂纹扩展至另一条预制裂隙内端或中部,岩桥区域主要产生拉伸型的贯通,且翼裂纹是张性的.数值模拟结果表明,非叠合裂隙试样强度均低于叠合裂隙试样强度,当裂隙呈现一定交角时,其相互之间会产生屏蔽效应,造成试样强度增加.
A numerical simulation of the experiment on rock with two pre-existing flaws of different rock bridge was proposed by using particle flow code. It is shown that wing fractures and secondary fractures appear under loading and fracture coalescence takes place with tension and shear mode when the rock bridge angle is 80° or 90°. But with the increase of load the wing fractures propagate to other fractures when the rock bridge angle is 120° and fracture coalescence takes place with tension mode. Furthermore, the simulation verifies that cracks will have their inter-shielding effect when they are in a certain angle, resulting in the increase of the strength of the sample.
出处
《深圳大学学报（理工版）》
EI
CAS
北大核心
2013年第2期190-194,共5页
Journal of Shenzhen University(Science and Engineering)
基金
国家自然科学基金资助项目(40772172)~~
关键词
岩土工程
颗粒流方法
裂隙岩体
雁行排列
裂纹
数值模拟
geotechnical engineering
particle flow code method
fractured rock
echelon arrangement
cracks
numerical simulation
