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岩体裂隙粗糙度和流体惯性效应是影响岩体裂隙网络等效渗透性的重要因素。首先回顾了单裂隙中裂隙粗糙度和流体惯性效应对其过流能力的影响;然后基于逆Broyden秩1拟牛顿迭代法求解控制裂隙内流体流动的非线性方程组,研究岩体裂隙粗糙度和流体惯性效应对离散裂隙网络(DFN)等效渗透性的影响;最后,基于两种不同边界条件,对离散裂隙网络模型内流体的流动特性进行了探讨。结果表明,当水力梯度较小(<0.5)时,裂隙粗糙度和流体惯性效应对离散裂隙网络渗透性的影响很小;当水力梯度较大(>0.5)时,裂隙粗糙度和流体惯性效应对离散裂隙网络渗透性的影响随水力梯度的变化而显著变化;在两种边界条件下,当水力梯度在0.1~10.0之间时,裂隙粗糙度和流体惯性效应对离散裂隙网络过流能力的最大影响分别为18.1%和27.5%。所以,当水力梯度较大时,需要在离散裂隙网络模型的渗流计算中考虑裂隙粗糙度和流体惯性效应的影响。
Rock mass fissure roughness and fluid inertia effect are important factors affecting the equivalent permeability of rock fracture network. Firstly, the effect of crack roughness and fluid inertia on the overcurrent in a single fracture is reviewed. Then, based on the inverse Broyden rank-1 quasi-Newton iterative method, the nonlinear equations governing the fluid flow in a fracture are solved, and the fracture roughness and Fluid inertia effect on the equivalent permeability of the discrete fracture network (DFN). Finally, the flow characteristics of the fluid in the discrete fracture network model are discussed based on two different boundary conditions. The results show that when the hydraulic gradient is small (<0.5), the effect of fracture roughness and fluid inertia on the permeability of discrete fractured network is very small. When the hydraulic gradient is large (> 0.5), the fracture roughness and fluid inertia effect The influence on the permeability of the discrete fracture network changes obviously with the hydraulic gradient. Under the two boundary conditions, when the hydraulic gradient is between 0.1 and 10.0, the effect of the fracture roughness and fluid inertia on the overcurrent capacity of the discrete fracture network The biggest impact was 18.1% and 27.5% respectively. Therefore, when the hydraulic gradient is large, the effect of fracture roughness and fluid inertia effect needs to be considered in the seepage calculation of discrete fracture network model.