基于3D-DIC技术的约束岩石裂缝扩展研究  

Research on Constrained Rock Crack Propagation Based on 3D-DIC Technology

作　　者：杜凯 邓建华[1] 王化俗 杨壮 代旭东 DU Kai;DENG Jianhua;WANG Huasu;YANG Zhuang;DAI Xudong(College of Civil Engineering,Guizhou University,Guiyang 550025,Guizhou,China)

机构地区：[1]贵州大学土木工程学院,贵州贵阳550025

出　　处：《力学季刊》2021年第4期743-751,共9页Chinese Quarterly of Mechanics

基　　金：国家自然科学基金(51068003);贵州省科技厅基金(黔科合J字[2011]2324号)。

摘　　要：采用RMT-301B岩石与混凝土力学实验系统对施加预应力值为峰值强度20%、40%、60%的泥质白云岩进行单轴压缩实验,并借助三维数字图像相关技术(3D-DIC)测试系统观测受约束岩石试样的变形和破坏形态,研究泥质白云岩在约束条件下的位移场和Tresca应变场的演化过程.结果表明:(1)岩石的破坏过程是由内向外扩展,当应力积累超出岩石承受范围后,岩石出现裂纹,随后裂纹尖端继续扩展,应力也发生了重分布,岩石内部多组裂纹开始联合扩展、贯穿,直到试件发生完全破坏.(2)含约束岩石在单轴压缩下一共有轴向劈裂破坏、沿片理破坏、Y形破坏、共轭剪切破坏四种破坏形态,且以轴向劈裂破坏为主.Uniaxial compression tests were carried out on the argillaceous dolomite with prestress of 20 %, 40 % and 60 % peak intensity using rock mechanics test system RMT-301 B. The three-dimensional digital image correlation(3 D-DIC) test system was used to observe the deformation and failure configuration of the constrained rock samples. The evolution process of displacement field and Tresca strain field of argillaceous dolomite under the constraint condition were calculated and analyzed. The results show that:(1) Failure process of the rock expands from the inside to the outside. When the accumulated stress exceeds the bearing range of the rock, the cracks appear in the rock, then the crack tip continues to propagate, and the stress is redistributed. Multiple groups of cracks inside the rock jointly expand, penetrate, and overlap until the specimen is completely destroyed.(2) Under uniaxial compression, the rock with restraint has four failure modes, i. e., axial splitting failure, foliation failure, Y-shaped failure, and conjugate shear failure, with the axial splitting failure being the main mode.

关 键 词：3D-DIC 泥质白云岩 约束 裂缝扩展 破坏形态 

分 类 号：O348[理学—固体力学]