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本文提出土体非稳定渗流数学模型和新计算方法,用以计算土坝饱和-非饱和区的渗流。在数学方程求解和数值计算中,采用伽辽金有限元法结合隐式向后差分法,编制出简单合理和切实可行的计算程序SUSED。并以唐山陡河土坝为计算对象,从坝中取样通过试验求得计算参数,用本文方法对该坝饱和-非饱和渗流进行数值计算,计算结果规律正常,令人满意,说明上述数学模型和计算方法是行之有效的,适用于稳定渗流和非稳定渗流。
In this paper, a mathematical model and a new calculation method for the unsteady seepage of soil are proposed to calculate the seepage flow in the saturated-unsaturated area of the earth dam. In mathematical equation solving and numerical calculation, Galerkin finite element method and implicit backward difference method are used to compile a simple, reasonable and practical calculation program SUSED. Taking the Tangshan steep river earth dam as the object of calculation, sampling from the dam through the test to obtain the calculation parameters, using this method to numerically calculate the saturated-unsaturated seepage of the dam, the calculation results are normal and satisfactory, indicating the above mathematical model The calculation method is effective and is suitable for stable seepage and unsteady seepage.