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自由面渗流分析的传统方法是将自由面作为可动边界处理。这种方法对有接近水平分层不同渗透介质的计算域不能适用,而且不能用同一网格计算渗流场及渗流应力。参照非线性应力问题中的初应力法,作者建议了用固定边界求解有自由面渗流问题的初流量法,成功地解决了传统方法的重大缺陷。本文对方法原理作了简要叙述并给出一个绕坝渗流分析的例题。
The traditional method of free surface seepage analysis is to treat the free surface as a movable boundary. This method can not be applied to the calculation domain with different permeability media close to horizontal stratification, and the seepage field and seepage stress can not be calculated by the same grid. With reference to the initial stress method in nonlinear stress problems, the author proposed a method of initial flow for solving free-seepage problems with fixed boundaries, which successfully solved the major shortcomings of the traditional method. This paper gives a brief description of the principle of the method and gives an example of the seepage analysis of a dam.