It is essential to understand the hydraulic behavior of rock apertures as the fluid flow path in the rock mass. The geometric parameters of fracture such as roughness of walls and fracture aperture have a significant effect on its hydromechanical behavior. In this paper, the laboratory tests are performed on the samples and then, the laboratory conditions are numerically simulated. The three-dimensional (3D) scanning of the walls of natural rock fractures is used to prepare the geometric model, and the ICEM CFD software is employed to prepare the geometry of fractures. Also, using the Ansys Fluent software and considering the Navier-Stokes equations in the model, the fluid flow in the rock fractures is simulated. Due to the fact that the two joint surfaces are in contact with each other, the model geometry is constructed in the case when the joints are mated and the contact is established in a certain percentage. In this way, the geometries are prepared for 15, 30, 45, 60, 75, and 90% contact between the upper and lower surfaces. The numerical modeling is also validated by the analytical Darcy formula, which indicates the accuracy of the modeling technique. The modeling results show that the macroscopic Forchheimer relation well describes the nonlinear fluid flow in the rock fracture. The values of linear and nonlinear coefficients of Forchheimer equation are estimated for each of the geometric models. The results show that the Forchheimer coefficients are directly related to the joint contact surface in an exponential manner, and the hydraulic aperture increases proportional to the reduced joint contact surface.

重要的是要了解岩石孔洞的水力行为作为岩体中的流体流动路径。裂缝的几何参数，例如壁的粗糙度和裂缝孔口，对其流体力学行为有重要影响。在本文中，对样品进行实验室测试，然后对实验室条件进行数值模拟。使用天然岩石裂缝壁的三维（3D）扫描来准备几何模型，并使用ICEM CFD软件来准备裂缝的几何形状。此外，使用Ansys Fluent软件并考虑模型中的Navier-Stokes方程，可以模拟岩石裂缝中的流体流动。由于两个关节面相互接触，当关节配对并且以一定百分比建立接触时，将构建模型几何。这样，就准备好在上表面和下表面之间进行15％，30％，45％，60％，75％和90％接触的几何形状。数值建模还通过解析达西公式进行了验证，该公式表明了建模技术的准确性。建模结果表明，宏观的Forchheimer关系很好地描述了岩石裂缝中的非线性流体流动。对于每个几何模型，估计Forchheimer方程的线性和非线性系数的值。结果表明，Forchheimer系数与关节接触面成指数关系，并且液压孔径与减小的关节接触面成正比。