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根据采动过程中裂隙岩体的应力变化,用法向载荷、剪切载荷和渗透水压分别模拟开采过程中采场的水平应力、垂向应力和水头压力,应用JAM-600型剪切-渗流耦合试验系统对裂隙岩体进行压剪-渗流藕合试验,探讨在恒定法向荷载(CNL)和法向刚度(CNS)条件下,裂隙岩体的法向载荷、裂隙粗糙度与渗透水压对试样的位移、应力和渗流性的影响规律,分析剪切位移大小和岩体裂隙的剪胀特性对裂隙岩体的剪切应力、法向位移、节理水力开度及渗透率影响规律。研究表明:剪切应力和水头压力对裂隙水力开度起促进作用,水平地应力对水力开度变化起抑制作用。随着剪切位移变化,水力开度可分为变小或持平、增大、稳定3个阶段。裂隙表面粗糙度越大,裂隙岩体的刚度越小,则水力开度最终稳定值越大。由于裂隙岩体的剪胀作用渗透率先变小后增大,剪切位移增大,渗透率增大;法向荷载增大,试件的渗透率越小;裂隙表面越粗糙,其渗透率越大,其研究结果可为岩体透水通道形成时的孕育、萌生和爆发的导渗灾变演化过程提供理论基础。
According to the change of stress of fractured rock mass during mining, the horizontal stress, vertical stress and head pressure of stope during mining are simulated respectively by normal load, shear load and seepage hydraulic pressure. By using JAM-600 shear-seepage Coupled test system is used to test the fractured rock mass under the condition of constant normal load (CNL) and normal stiffness (CNS). The normal load, the crack roughness and the seepage hydraulic pressure The influences of shear displacement and dilatancy of rock fissures on the shear stress, normal displacement, hydraulic opening and permeability of fractured rock mass are analyzed. The results show that the shear stress and the head pressure can promote the hydraulic opening of fractures, and the horizontal stress can inhibit the hydraulic opening. With the shear displacement changes, hydraulic opening can be divided into smaller or flat, increase, stable three stages. The greater the surface roughness of fractures, the smaller the stiffness of fractured rock mass, the greater the final stable value of hydraulic opening. Due to the dilatancy effect of fractured rock mass, the permeability decreases first and then increases, the shear displacement increases, and the permeability increases; the normal load increases, and the permeability of the specimen decreases; the rougher the fracture surface, the more the permeability The results of this study can provide a theoretical basis for the process of the initiation, catastrophic and explosive catastrophic evolution during the formation of water-permeable passages in rock mass.