三轴压缩岩石细观损伤扩展特性CT实时检测

Real-time CT Monitoring for the Meso-damage Propagation Characteristics of Rock Under Triaxial Compression

利用作者最新研制的与 CT(computerized tomography)机配套的专用加载设备 ,完成了三轴压缩荷载作用下岩石破坏全过程的细观损伤扩展规律的实时 CT检测试验 .得到了在不同荷载作用下岩石中微孔洞被压密、微裂纹萌生、分叉、发展、断裂、破坏、卸载等各个阶段清晰的 CT图像 .对得到的 CT数、CT图像等数据进行了分析 ,引入了初始损伤影响因子和闭合影响系数 ,定义了一个基于 CT数的新的损伤变量 ,基于岩石细观损伤演化 CT试验的结果 ,给出了岩石应力损伤门槛值 ,将岩石应力应变全过程曲线分为 5段 。

The real-time computerized tomography (CT) testing for the meso-damage propagation law of sandstone failure under triaxial compression has been completed by using the newest triaxial loading equipment developed by the authors associated with the CT machine. Through the CT scanning, clear CT images are obtained for the micro-crack compressed, crack-growth, bifurcation, development, crack fracture,the rock sample failure and the unloading stage. The CT values, CT images and other data have been analyzed, the initial damage effect factor and the closed effect coefficient are introduced, and a new damage variable based on the CT values is defined. Based on the results of the CT testing of meso-damage evolution law of rock, the stress threshold value of meso-damage of rock is given, and the stress-strain complete curve of rock is divided into 5 sections. The initial rock damage propagation law is given.