单轴压缩条件下非贯通裂隙岩体变形研究  

Deformation analysis of non-penetrating cracked rock mass under uniaxial compression conditions

作　　者：蒲诚 李跃涛[1] 温家兴 赵靖伟[1] PU Cheng;LI Yuetao;WEN Jiaxing;ZHAO Jingwei(PowerChina Northwest Engineering Corporation Limited,Xi'an 710065,China;Postdoctoral Research Station of PowerChina Northwest Engineering Corporation Limited,Xi'an 710065,China)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,西安710065 [2]中国电建集团西北勘测设计研究院有限公司博士后科研工作站,西安710065

出　　处：《西北水电》2023年第3期51-56,共6页Northwest Hydropower

基　　金：国家自然科学基金(41877278);西北旱区生态水利国家重点实验室项目(QNZX-2019-07)。

摘　　要：借助CCD相机观察含不同种类、不同倾角的非贯通裂隙试件单轴压缩试验的破坏过程,并通过扫描电镜试验对裂纹扩展的内在机理进行揭示。结果表明:裂隙岩体试件的破坏主要是由翼裂纹产生,并与预制裂隙一起形成贯通的剪切面而引起的压剪破坏;岩体的起裂及破坏并非完全按照主裂隙方向,次裂隙的存在极大的影响了岩体的破坏过程;裂隙越发育、裂隙倾角越小,试件越容易发生破坏、破坏时长越长;试样破坏过程主要是由于大颗粒及其团粒发生破碎,进而颗粒发生绕长轴方向的移动;颗粒相对位置的变化导致试样内部生成大量微孔隙与微裂纹,微裂纹逐渐融合并联通生成宏观翼裂纹,最终导致试件的破坏。研究结果为地下洞室围岩破坏预测及内在机理揭示提供了相应的理论基础。The failure process of uniaxial compression test of non-penetrating fracture specimens with different types and inclination angles is observed with the help of CCD camera,and the internal mechanism of crack propagation is revealed by Scanning Electron Microscopy test.The results show that the failure of fractured rock mass specimens is mainly caused by wing cracks,and together with the prefabricated fractures,the shear failure is caused by the formation of a penetrating shear surface.The cracking and failure of rock mass are not completely in the direction of the main fracture,and the existence of secondary fracture greatly affects the failure process of rock mass.The more developed the fracture and the smaller the inclination angle of the fracture,the more likely the specimen is to be damaged and the longer the failure time;The sample failure is mainly due to the fragmentation of large particles and their agglomerates,and then the particles move around the long axis;The change of the relative position of the particles leads to the formation of a large number of micropores and microcracks inside the specimen,and the microcracks gradually fuse and connect to form macroscopic wing cracks,which eventually leads to the destruction of the specimen.The research results provide a theoretical basis for the prediction of surrounding rock failure and the revelation of the internal mechanism of underground caverns.

关 键 词：非贯通裂隙岩体 扫描电镜试验 变形 内在机理 

分 类 号：TU43[建筑科学—岩土工程]