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岩体边坡工程与地下工程稳定性主要依赖岩体中的节理、裂隙、软弱夹层等结构面的力学性态。基于岩体低渗透性与结构面导水性,采用广义双重介质模型,对孔隙空间建立非饱和渗流HM耦合方程。对饱水/干燥裂隙空间建立裂隙受压体积变化的HM耦合方程。通过考虑孔隙和裂隙界面处压力连续,实现两处模型在应力边界上的耦合。对开口裂隙、封闭裂隙、半开半闭裂隙岩体的非饱和渗流过程进行了数值模拟计算。由计算结果得知:裂隙的闭合程度影响裂隙水向孔隙消散,从而影响裂隙刚度;在正应力作用下,裂隙受压逐渐分段闭合,由于裂隙的不同位置具有不同的刚度特征,整条裂隙不具同步性,甚至由于裂隙面性质不同,刚度变化甚至出现反复性。
Rock mass slope engineering and underground engineering stability depend mainly on the mechanical properties of rock mass joints, fractures, weak intercalations and other structural planes. Based on the low permeability of rock mass and the hydraulic conductivity of the structural plane, a generalized dual-media model is used to establish the unsaturated coupled HM coupled equations for pore space. Establishing HM Coupling Equation for Pressure Change of Fracture in Water-saturated / Dry Fracture Space. By considering the continuous pressure at the interface between pore and fracture, the coupling of the two models on the stress boundary is achieved. The unsaturated seepage process of open fractured rock, closed fractured rock and half open fractured rock mass are numerically simulated. The calculated results show that the degree of closure of fractures affects the dissipation of fissure water to the pores and thus the stiffness of fissures. Under the normal stress, fractures gradually close in compression, and due to different stiffness characteristics at different positions, the entire fissure Not synchronized, and even because of the nature of the fracture surface, the stiffness changes even repeated.