单轴压缩下透明类岩石损伤演化特征研究  

Research on damage evolution characteristics of transparent rock under uniaxial compression

作　　者：朱昌星[1] 安烨明 李伟东 ZHU Changxing;AN Yeming;LI Weidong(School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China)

机构地区：[1]河南理工大学土木工程学院,河南焦作454000

出　　处：《实验力学》2022年第5期701-710,共10页Journal of Experimental Mechanics

基　　金：国家自然科学基金资助项目(51874119);河南省教育厅基金资助项目(2011A440003);河南理工大学博士基金资助项目(B2009-96)。

摘　　要：为研究岩石变形破坏模式及内部裂纹扩展过程,采用环氧树脂、固化剂、熔融石英砂与玻璃砂制备非均质、各向异性的新型透明类岩石,通过室内单轴压缩试验及颗粒流(PFC2D)数值模拟,分析了其破坏模式及裂纹演化过程。室内试验中,透明类岩石峰值强度在砂岩强度范围内的破坏模式与砂岩相似,呈现劈裂剪切混合破坏,裂纹发育大多以层理面为起始点;对比PFC2D数值模拟与室内试验,两者应力-应变曲线相似,最终破坏模式及过程基本一致;将透明类岩石的PFC2D裂纹累积演化曲线划分为无损伤、初始损伤、损伤发展、损伤加速发展、损伤破坏阶段,并确定了其损伤门槛值。本文试验结果,可为直接观察岩石内部裂纹扩展提供参考。To analyze the deformation and failure characteristics and internal crack propagation process of rock, a new heterogeneous and anisotropic transparent rock was prepared with epoxy resin, curing agent, fused quartz sand, and glass sand. Its failure mode and crack evolution process were analyzed by indoor uniaxial compression test and particle flow(PFC2 D) numerical simulation. In the laboratory test, the peak strength of transparent rock is within the range of sandstone strength, and the failure mode is similar to sandstone, showing split shear mixed failure. Most of the cracks start from the bedding plane. Furthermore, compared with PFC2 D numerical simulation and laboratory test, their stress-strain curves are similar, and the final failure mode and process are basically the same. In addition, based on the PFC2 D crack cumulative evolution curve of transparent rock, the damage is divided into five stages: no damage, initial damage, damage development, accelerated damage development, and damage failure, and the damage threshold is determined. The test results can provide reference for direct observation of crack propagation in rock.

关 键 词：透明类岩石 环氧树脂 裂纹扩展 PFC2D 损伤演化 

分 类 号：TU45[建筑科学—岩土工程]