随着煤矿开采深度增加，在高应力、强渗透压与强开采扰动作用下断层极易发生活化，造成底板水害日趋严重。现有研究发现在深部岩体中，耦合剪切断裂因易于起裂、传播距离远和瞬时性的特点成为导水通道形成的关键因素。本项目以底板断层活化后围岩体的剪切破断为研究对象，进行如下研究：①利用岩石应力渗流耦合试验机，结合声发射监测对断层围岩开展同步注水直剪试验，揭示不同岩性及流固力学环境对剪切裂纹传播的影响规律，提出剪切临界触发条件(Kmin)；②基于SEM扫描结果，利用Kmin和损伤变量对可预测裂纹扩展的F准则进行修正，研究深部采动及耦合作用下岩石剪切裂纹的传播特征；③创建底板断层条块体突水模型，结合FRACOD力-液-裂纹耦合算法，揭示断层围岩剪切裂纹扩展至突水通道形成时空演化规律，探讨断层剪切破断突水机制。本项目有助于推进断裂力学在矿井突水领域的应用，对防治深部高承压突水灾害具有重要的科学意义和应用前景。

With the increase of coal mining depth, faults are easy to be activated under the action of high stress, strong permeability and strong mining disturbance, resulting in increasingly serious floor water damage. Existing studies have found that in deep rock mass, the coupling shear fracture is the key factor for the formation of water channel because of its easy initiation, long propagation distance and instantaneity. This project takes the shear failure of the surrounding rock mass after the fault activation in the floor as the research object, and the following research work is carried out: ①By using the rock stress and seepage coupling test machine, combined with the acoustic emission monitoring, the water injection and direct shear test of fault surrounding rock is carried out, the effects of different lithology and fluid solid mechanical environment on shear crack propagation are revealed, and the shear critical trigger conditions are put forward (Kmin); ②Based on SEM scanning, the F criterion of predictable crack propagation is modified by Kmin and damage variable, and the propagation characteristics of shear cracks of rock under deep mining and coupling are simulated and studied. ③The block water inrush model containing floor fault is established, and the time-space evolution laws of shear cracks propagation near the fault to the formation of water inrush channel is revealed by combining the FRACOD force-hydraulic-cracks coupling algorithm, the mechanism of water inrush induced by shear fracturing of faults is discussed. This project is helpful to promote the application of fracture mechanics in the field of mine water inrush, and it has important scientific significance and application prospects for the prevention and control of water inrush in deep mining.