均质土坝正交各向异性渗流场数值模拟

Numerical simulation of orthotropy seepage field of homogeneous earth-rock dam

土石坝受填筑材料颗粒含量比例、颗粒级配、施工方法等因素的影响,使其颗粒在不同方向上的排列不同,进而在宏观上表现出非均质性和各向异性。以均质土坝为研究对象,采用数值模拟方法研究了稳定渗流条件下坝体填筑材料各向异性渗透特性对坝体渗流场分布的影响,重点分析了坝体浸润线、下游坝坡出逸点高程、单宽流量、坝体最大渗透比降的变化规律。研究表明:随着土石坝填筑材料水平向渗透性能逐渐增强,坝体浸润线呈上凸型曲线,且位置逐渐上升;坝坡下游出逸点高程和大坝渗流量均有较大幅度上升;而坝体最大渗透比降仅有微小上升,影响甚小。

Earth-rock dams are affected by factors such as particle content ratio of the filling materials,particle gradation,construction methods,etc.,so that the particles are arranged differently in different directions,and thus exhibit macroscopic heterogeneity and anisotropy.In this paper,the homogeneous earth-rock dam is taken as the research object,and the influence of anisotropy and permeability of the dam body filling materials on the seepage field distribution under the condition of stable seepage flow is studied by means of numerical simulation.And,we focus on the analysis of the seepage line of the dam,the elevation of the outflow point of the downstream dam slope,the flow rate of the single width,the change of the maximum permeability ratio of the dam.The results show that the infiltration curve of the dam body is convex and the position gradually rises with the increase of the permeability of the filling material.The elevation of the downstream exit point and the seepage flow of the dam increased greatly.However,the maximum permeability of the dam is only slightly increased,indicating that the enhancement of horizontal permeability has little effect on it.