基于连续介质的裂隙岩体流固耦合数值分析

Numerical analysis of fluid-solid coupling in fractured rock mass based on continuous medium

基于库区水位涨落或暴雨入渗,经过演变易造成滑坡,研究渗透压作用下裂隙损伤效应对渗透张量的影响,通过理论推导,提出裂隙岩体渗流场与损伤场耦合的分析模型;以湖北潘口水电站进水口边坡为研究对象,建立基于连续介质的裂隙岩体流固耦合渗流数值计算分析方法。研究结果表明:边坡在开挖过程中变形以卸荷回弹变形为主,回弹变形范围随开挖逐级增大,各级边坡开挖对邻级边坡变形的影响最显著,对较远坡段的影响逐步减弱;边坡开挖面基本处于小拉应力状态,边坡浅表层拉应力区分布范围及量值均很小;边坡全部开挖完成后,边坡的塑性区主要沿近坝的开挖马道外缘分布,分布范围小,在表层岩体内;裂隙岩体流固耦合模型的三维数值计算能够较真实地模拟边坡开挖过程位移场、应力场、塑性区、拉应力区的分布规律。

Considering that reservoir water level fluctuation or rainstorm infiltration will cause landslide, the effect of crack damage effect on the permeability tensor was studied. Through theoretical deduction, the analysis model of coupling of seepage field and damage field in fractured rock mass was put forward. Then taking the Hubei Pankou hydropower station intake-slope as object, a numerical analysis method of fluid solid coupling seepage flow in fractured rock mass was established based on the equivalent continuous medium. The results show that deformation of slope is mainly based on unloading springback during excavation;deformation range increases with the increase of excavation;the influence of slope excavation at all levels on the deformation of adjacent level slope is the most significant;distance slope section is gradually weakened. After the completion of the excavation, slope of the plastic zone is mainly layed along the near dam outer edge of the distribution, and the distribution range is small and in the surface of rock mass. Three-dimensional numerical calculation of fluid solid coupling model of fractured rock mass can simulate the distribution law of the displacement field, stress field, plastic zone and tensile stress zone of the slope excavation process.