基于渗流场与应力场耦合分析的尾水渠施工期渗流场数值分析

Analysis of tailrace construction period seepage field based on seepage field and stress field coupling analysis

本文通过建立尾水渠岩土体渗流的数学模型,结合电站尾水渠典型断面确定边界条件,利用伽辽金有限元方程进行数值计算,对尾水渠施工期渗流场进行模拟。得到以下几点结论:在渗流出溢处水力坡降超出允许水力坡降时,该处需采取工程措施,以免发生渗透破坏;基岩的水力坡降均小于允许水力坡降时,该处渗流是稳定的。

The mathematical model of tailrace rock soil seepage flow is established in the paper. Boundary conditions are determined by combining with the typical sections of power station tailrace. Galerkin finite element equation is utilized for numerical calculation. Tailrace construction period seepage field is simulated for obtaining the following conclusions：project measures should be adopted when the hydraulic gradient of seepage overflow exceeds allowable hydraulic gradient,thereby avoiding seepage failure,and the seepage flow is stable when the hydraulic gradient bedrock is smaller than allowable hydraulic gradient.