动静荷载下类节理岩体裂纹扩展特性研究  

Crack Propagation Characteristics of Jointed Rock Mass Under Static and Dynamic Loads

作　　者：孙冰 罗瑜 谢杰辉 曾晟[2] SUN Bing;LUO Yu;XIE Jie-hui;ZENG Sheng(School of Civil Engineering, University of South China, Hengyang, Hunan 421001;School of Nuclear Resources Engineering, University of South China, Hengyang, Hunan 421001, China)

机构地区：[1]南华大学土木工程学院,湖南衡阳421001 [2]南华大学核资源工程学院,湖南衡阳421001

出　　处：《南华大学学报（自然科学版）》2018年第2期37-42,共6页Journal of University of South China：Science and Technology

基　　金：国家自然科学基金青年项目(51204098);湖南省自然科学基金项目(2018JJ2331);湖南省科技厅重点研发计划项目(2015SK20584);湖南省研究生科研创新项目(CX2017B532)

摘　　要：为了研究节理岩体在动静荷载下的裂纹扩展特性,采用室内试验和颗粒离散元程序PFC2D5.0对类节理岩体在动静荷载下的破坏形态进行研究.对比分析不同荷载下节理倾角对破坏形态的影响.结果表明,节理倾角等于45°时为翼裂纹与次生裂纹转变的临界角度值;当倾角小于45°时,新生裂纹主要为翼裂纹,裂纹起裂与岩体破坏主要受张拉应力控制;当倾角大于45°时,新生裂纹主要为次生裂纹.裂纹起裂与岩体破坏主要受剪切应力控制.在冲击荷载下,单节理岩体与双节理岩体的破坏形态类似,都为张拉破坏,主要裂纹形式为翼裂纹.In order to study the crack propagation characteristics of jointed rock mass under static and dynamic loads,the failure modes of jointed rock mass under dynamic and static loads were studied by laboratory tests and particle discrete element program PFC2 D5.0.The influence of joint inclination angle on failure mode under different loads was analyzed.The results show that the critical angle of the transition between the wing crack and the secondary crack is equal to 45.When the dip angle is less than 45,the new crack is mainly wing crack,crack initiation and rock mass damage are mainly controlled by tensile stress; Whenthe dip angle is greater than 45,the primary crack is secondary crack.Crack initiation and rock mass failure are mainly controlled by shear stress. Under impact load,the failure modes of single jointed rock mass and double jointed rock mass are similar,they are tensile failure,and the main crack forms are wing cracks.

关 键 词：岩石力学 组合节理 裂纹扩展 数值模拟 

分 类 号：TU45[建筑科学—岩土工程]