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为了解高压水渗流作用对裂隙岩体应力和变形的影响,结合黑麋峰抽水蓄能电站岩体高压压水试验的渗压及变形测试成果,采用多孔连续介质全耦合理论,研究了试验区岩体测点在压水孔加压和卸压过程中的孔隙压力和位移变化过程。通过对测点位移和渗压随时间变化过程的计算值和实测值对比研究,验证了所采用的水-岩耦合数值模型的合理性。研究表明:在压水孔内的水压力和岩体孔隙压力的共同作用下,岩体内的应力大幅度增加;压水过程中,岩体因渗流作用产生了较大的位移,停止压水后的一段时间内,由于岩体中还存在一定的孔隙水压力和水压力梯度,从而导致岩体内仍存在部分变形值,且该部分变形值并非是压水孔卸载后岩体内的塑性残余变形;高压水渗流作用下的岩体耦合效应对工程应力和围岩变形有重大影响,考虑水-岩耦合效应的岩体稳定性评价结果对工程设计更具指导意义。
In order to understand the effect of high pressure water seepage on the stress and deformation of fractured rock mass, combined with the results of seepage pressure and deformation test of the rock mass HPP water test at Black Moose Pumped Storage Power Station, Pore pressure and displacement of rock mass measuring point during pressurization and pressure relief of pressurized water hole. By comparing the calculated and measured values of displacement and infiltration pressure with time, the rationality of the numerical model of water-rock coupling is verified. The results show that the stress in the rock mass increases greatly under the combined effect of the water pressure in the water hole and the pore pressure of the rock mass. During the water pressure, the rock mass has a larger displacement due to seepage, After some time, due to the existence of some pore water pressure and water pressure gradient in the rock mass, some deformation values still exist in the rock mass, and the deformation value is not the plasticity in the rock mass after the unloading of the pressurized water hole Residual deformation. The coupled effect of rock mass under high pressure water seepage has a significant impact on the engineering stress and deformation of surrounding rock. The evaluation of rock mass stability considering the water-rock coupling effect is more instructive for engineering design.