煤岩三轴细观损伤演化规律的CT动态试验

A REAL IN TIME CT TRIAXIAL TESTING STUDY OF MESO DAMAGE EVOLUTION LAW OF COAL

利用本文第一作者主持设计和研制的与ＣＴ机配套的专用加载设备， 进行了三轴和单轴荷载作用下煤岩破坏全过程的细观损伤演化规律的即时动态ＣＴ（ｃｏｍ ｐｕｔｅｒｉｚｅｄ ｔｏｍ ｏｇｒａｐｈｙ）试验。得到了在不同荷载作用下煤岩中微孔洞被压密→微裂纹萌生→分叉→发展→断裂→破坏→卸载等各个阶段清晰的ＣＴ图象， 引入了初始损伤影响因子，定义了一个基于ＣＴ数的新的损伤变量。

The dynamic computerized tomography test of meso damage evolution law is completed for the whole destroyed process of coal rock sample using the newest specified loading equipment corresponding to the CT machine in triaxial and uniaxial compression. Through CT scaning, the clear CT image is obtained which includes the microhole(microcrack) compressed→the microcrack growth→the microcrack bifurcation→the microcrack development→crack fracture→rock sample destroyed→unloading in the different stress state. The CT values, CT images and the other data are analysed. An initial damage effect coefficient is considered, a new damage variable based on CT values is defined. The coal rock damage propagation law is researched.