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在高水头作用下水力劈裂临界孔隙水压计算方法对围岩的稳定性分析有重要意义。根据断裂力学基本原理,结合大型计算软件FLAC-3D,对在高水头作用下围岩裂缝是否会扩展失稳及原本不存在裂缝的围岩是否会产生新的裂缝做出了判断,给出计算水力劈裂临界孔隙水压的两种方法,确定了围岩发生失稳破坏的临界孔隙水压力,并结合实际工程论证了两种方法的可行性,获得了方法的适用范围。
Under the action of high head, the critical pore water pressure calculation method of hydraulic fracturing is of great significance to the stability analysis of surrounding rock. According to the basic mechanics of fracture mechanics and the large-scale calculation software FLAC-3D, it is judged whether the surrounding rock of the surrounding rock will be expanded and destabilized under high water head and whether there will be new cracks in the surrounding rock which does not exist. Two methods of hydraulic fracturing of critical pore water pressure were used to determine the critical pore water pressure of the surrounding rock under instability failure. The feasibility of the two methods was proved with the actual project, and the applicable scope of the method was obtained.