含裂纹试件双轴压缩裂纹扩展数值模拟研究  

Numerical Simulation of Biaxial Compression Crack Growth of Specimen with Single and Double Internal Cracks under Different Hydraulic Fracturing Factors

作　　者：米文静 Mi Wenjing(College of Urban-Rural Planning and Architectural Engineering,Shangluo University,Shangluo,Shaanxi 726000,P.R.China;College of Water Conservancy and Architectural Engineering,Northwestern University of Agriculture and Forestry Science and Technology,Yangling,Shaanxi 712100,P.R.China)

机构地区：[1]商洛学院城乡规划与建筑工程学院,陕西商洛726000 [2]西北农林科技大学水利与建筑工程学院,陕西杨凌712100

出　　处：《地下空间与工程学报》2020年第2期516-523,共8页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(51379220,51279171)。

摘　　要：为研究内水压作用下的岩石内部裂纹扩展规律,利用围线积分计算裂纹在水压及单、双轴压力下的裂纹扩展特性,并与现有的试验结果进行了对比。研究结果表明:单、双裂纹首先在裂纹的尖端生成"翼形裂纹",水力压裂因子越大,单裂纹翼裂纹与原预制裂纹的夹角越小;水力压裂因子越大,监测点的裂纹扩展速率越快,对于单裂纹而言,断口处的扩展速率要高于长轴,对于双裂纹试样,裂纹内侧的扩展速率则要大于外侧;水力压裂因子越大,1、2、3型应力强度因子也越大。研究成果为认识水压力以及双轴应力下的单、双内裂纹扩展机理提供了一定的参考。In order to study the crack propagation process,the crack propagation characteristics under water pressure and uniaxial and biaxial pressures were calculated by using the contour integral.Compared with the existing test results,the results show that the"wing crack"is formed at the crack tip of single and double cracks.The larger the hydraulic fracturing factor is,the smaller the angle between single crack wing crack and original prefabricated crack is.The larger the hydraulic fracturing factor is,the faster the crack growth rate of the monitoring point is.For a single crack,the growth rate of the fracture is higher than that of the long axis,and for a double crack sample,the growth rate of the inner side of the crack is higher than that of the outer side.The greater the hydraulic fracturing factor is,the greater the stress intensity factors of type I,II and III are.The results provide a reference for understanding the mechanism of uniaxial and biaxial crack growth under water pressure and biaxial stress.

关 键 词：水力压裂因子 内裂纹 双轴压缩 裂纹扩展 数值模拟 

分 类 号：TU432[建筑科学—岩土工程]