裂隙岩体细观裂纹演化机制及局部力学特性研究  

Study on meso-crack evolution mechanism and local mechanical properties of fractured rock mass

作　　者：刁杨龙 洛锋[1,2,3] 李盟 吕振[1] 续培东 郭钇君 Diao Yanglong;Luo Feng;Li Meng;LV Zhen;Xu Peidong;Guo Yijun(Hebei University of Engineering,Handan 056038,China;Technology Innovation Center of Mine Construction of Hebei Province,Handan 056038,China;Handan Key Laboratory for Ground Control and Disaster Prevention of Deep Roadways,Handan 056038,China)

机构地区：[1]河北工程大学,河北邯郸056038 [2]河北省煤炭矿井建设技术创新中心,河北邯郸056038 [3]邯郸市深部巷道围岩控制及灾害防治重点实验室,河北邯郸056038

出　　处：《煤炭与化工》2021年第9期22-26,共5页Coal and Chemical Industry

基　　金：国家自然科学基金项目(51804093)。

摘　　要：为研究含裂隙砂岩局部细观力学特性及不同倾角下岩体内部裂纹发育特征,通过单轴压缩试验及PFC^(2D)程序对不同角度单裂隙红砂岩进行细观裂纹演化模拟及裂隙周边应力监测分析,结果表明,单一裂隙的存在会显著影响完整试样的宏观破坏模式;在一定角度范围内,初始裂纹萌生于预制裂隙处,并随裂隙角度的增加,萌生位置的范围也增大,裂隙尖端微裂纹的集结效应越不明显;裂隙两尖端位置与上(下)部位置的应力峰值之差,随着裂隙角增大而逐渐减小。In order to study mesoscopic mechanics characteristics and the internal crack development of the fractured sandstone,a uniaxial compression experiment and PFC^(2D) numerical simulation analysis of different angles fractured red sandstone specimens were performed.And evolution of mesoscopic crack simulation and surrounding stress of the fracture were obtained in different angles fractured red sandstone.The results showed that the macro failure mode of complete specimen would be significantly affected by the prefabricated single fracture.Within a certain angle range,the initial crack originated at the prefabricated fracture,and with the increase of the fracture angles,the range of the initiation location increased,also the aggregation effect of the mesoscopic crack at the crack tip became less obvious.The difference of stress peak between the two fractured tips and the upper(lower)part decreased with the increase of fractured angles.

关 键 词：裂隙岩体 PFC模拟 裂隙倾角 裂纹演化 周边应力 

分 类 号：TU45[建筑科学—岩土工程]