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本文以共线剪切裂纹的归并为例，研究裂纹系的动态相互作用．实验结果表明：在张破裂的意义上，小间距共线剪切裂纹的内端部实际上是阻碍结构，通过迂回弯曲的张破裂归并．本文提出一种估计张破裂扩展途径的近似方法，利用张应力破裂判据找出了潜在的破裂扩展途径的第一近似，较好地模拟了共线裂纹的破裂途径，和现有的数值模拟方法比较，可以大大缩短机时，简化计算程序，保证精确度．本研究结出了岩石剪切破裂“隧道效应”（即破裂跳过障碍体，而障碍体本身不破坏）的机理，还给出了脆性介质在摩擦、磨损过程中碎屑产生的机理．
In this paper, taking the mergence of collinear shear cracks as an example, the dynamic interaction of the crack lines is studied. The experimental results show that the inner ends of the small-pitch collinear shear cracks are in fact obstructive structures in the sense of cracking, which are merged by the deforming fracture of circuitous bending. In this paper, an approximate method for estimating the propagation path of a crack is proposed. The first approximation of the potential fracture propagation path is found by using the tensile stress fracture criterion. The crack propagation path of a common crack is well simulated and the existing numerical simulation Compared with the method, the machine time can be greatly shortened, the calculation procedure can be simplified, and the accuracy can be guaranteed. In this study, the mechanism of “tunneling” (ie, breaking through the obstacles and the failure of the obstacle itself) of the rock-shearing fracture was concluded. The mechanism of debris generation during the friction and wear of the brittle medium was also given.