两条雁行预制裂隙贯通机制的细观数值模拟  

Micro-numerical simulation on mechanism of fracture coalescence between two pre-existing flaws arranged in echelon

作　　者：李凡[1] 李雪峰[1] 

机构地区：[1]合肥工业大学土木与水利工程学院,合肥230009

出　　处：《深圳大学学报（理工版）》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)~~

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.

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 

分 类 号：TU452[建筑科学—岩土工程]