无限深透水坝基渗流场与应力场耦合分析

The coupling analysis of seepage field and stress field on the infinite deep pervious foundation

无限深透水坝基的渗流问题是建在此类地基上土石坝成败的关键问题。渗流场和应力场耦合计算更加符合渗流实际情况。该文基于土体孔隙率和渗透性的相互关系,借助有限元软件geostudio/seepage和Sigma/w双场耦合模型,研究符合耦合计算的操作步骤;利用模型对实际工程进行计算,得到了沉降量,孔隙率的变化,主应力、渗透量及渗透坡降等关键参数在耦合时的变化规律。计算结果说明了坝基孔隙率和渗透系数相互作用并趋于稳定的过程,符合实际观测情况。

Infinite deep pervious foundation seepage problem is one of the key problems of earth-rock dam on the success or failure. The seepage field and stress field coupling more accords with the actual situation of seepage calculation. Based on the relationship of the soil porosity and permeability, with the aid of the finite element software geostudio/seepage and double field coupling model of seepage Sigma/w, calculation steps in conformity with the coupling are studied. By using model to simulate the actual engineering calculation, the change rules of key parameters, such as settlement, the change of porosity, principal stress, osmotic quantity and seepage slope, are developed when coupling. Calculation results show that the relationship of dam foundation coefficients of permeability and porosity, is a process of interaction and stable, the calculation results accord with actual observations.