复合土工膜缺陷渗漏试验的饱和－非饱和渗流有限元模拟研究

介绍了复合土工膜缺陷渗漏量室内物理模型试验以及缺陷渗漏量的经验拟合公式等成果。应用非稳定饱和－非饱和渗流理论和Galerkin有限元法，建立了该试验的三维有限元数值计算模型，对试验工况进行数值模拟。根据物理模型试验试样的轴对称性，选取中心角10度的试样建立精细三维有限元模型，详细模拟了室内试验条件下不同压力水头作用的渗漏在砂土试样中不断发展的过程，并计算了稳定渗漏量。分析比较了数值模型计算成果与物理模型试验结果，两者变化规律一致。可见提出的数值模拟方法可以较好地模拟复合土工膜缺陷渗流场，计算缺陷渗漏量。

Study on finite element simulation for saturated-unsaturated seepage of leakage due to defects in geomembranes

An indoor physical model test of geomembrane defect leakage and its empirical formula for calculating seepage flux of defect leakage are introduced. By use of the unstable saturated-unsaturated seepage theory and Galerkin finite element method, a 3-D FEM calculation model is set up for the test, and the test conditions are simulated. According to the axial symmetry of physical model, a central angle with 10 degree of the sample is selected to build the 3-D FEM model program. The processes of seepage flow in the sand sample through the defect hole are simulated under some different water head condition for indoor test, and the seepage flux is calculated when seepage flow reaches to stable. The calculation results by FEM are compared with to the results by physical model test. It is shown that law of leakage flux change of the two models is same. Therefore the proposed numerical method can be used to simulate the seepage flow field of geomembrane leakage, and to calculate the defect leakage flux too.