考虑动水压力裂隙网络岩体渗流应力耦合分析

Mathematical model for coupled seepage and stress fields in rock mass of fracture network by considering hydrodynamic pressure

渗流对裂隙网络岩体的作用力包括渗透静水压力和渗透动水压力(裂隙壁切向拖曳力)两部分。较全面地引入渗流与应力之间的相互作用关系,同时考虑渗透静水压力和切向拖曳力的作用,以裂隙(等效)隙宽与岩体应变的关系为桥梁,建立裂隙网络岩体渗流场与应力场耦合分析的数学模型,并采用有限元数值方法进行某工程实例的双场耦合分析,验证所建立模型的可靠性。

The action forces applied on rock mass of fracture network by seepage include two parts:hydrostatic seepage pressure and hydrodynamic seepage pressure(tangent hauling force applied on fissure walls).The whole interaction between seepage and stress was introduced in this paper.With the hydrostatic seepage pressure and tangent hauling force being simultaneously considered,the mathematical model for coupled seepage and stress fields in rock mass of fracture network was established with the linkage of the(equivalent )aperture and the strain of rock mass.An engineering example is computed by FEM to show the applicability of the model for coupled seepage and stress fields.