| 复合土工膜缺陷渗漏试验的饱和-非饱和渗流有限元模拟 |
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| 引用本文： | 沈振中,江沆,沈长松.复合土工膜缺陷渗漏试验的饱和-非饱和渗流有限元模拟[J].水利学报,2009,40(9). |
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| 作者姓名： | 沈振中 江沆 沈长松 |
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| 作者单位： | 1. 水资源高效利用与工程安全国家工程研究中心,江苏,南京,210098;河海大学水利水电工程学院,江苏,南京,210098
2. 河海大学水利水电工程学院,江苏,南京,210098 |
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| 摘 要： | 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，建立了三维有限元数值计算模型，对该试验进行数值模拟。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变化情况，并计算了渗漏达到稳定时的渗漏量。数值模型计算成果与物理模型试验结果变化规律一致，论证了数值饱和-非饱和渗流方法可以较好地模拟复合土工膜缺陷渗流场，并计算缺陷渗漏量。
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| 关 键 词： | 复合土工膜 缺陷渗漏量 非稳定饱和非饱和渗流 数值模拟 |
Numerical simulation of composite geomembrane defect leakage experiment based on saturated unsaturated seepage theory |
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| SHEN Zhen zhong.Numerical simulation of composite geomembrane defect leakage experiment based on saturated unsaturated seepage theory[J].Journal of Hydraulic Engineering,2009,40(9). |
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| Authors: | SHEN Zhen zhong |
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| Affiliation: | 1. National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Nanjing 210098, China; 2. Hohai University, Nanjing 210098, China |
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| Abstract: | A physical model experiment on composite geomembrane defect leakage was carried out. Based on the unsteady saturated unsaturated seepage theory and Galerkin finite element method, a 3 D FEM calculation model for simulating the experiment was established. Since the physical model is axial symmetric, the seepage through the defect hole in a section of sand sample with central angle 10° was selected to carry out the FEM calculation. The seepage fields and the seepage fluxes under different water head when seepage flow reached the stable situation were obtained. The calculated leakage fluxes are in good agreement with the experimental results. It demonstrates that the numerical simulation approach is reliable. |
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| Keywords: | composite geomembrane defect leakage flux unstable saturated unsaturated seepage numerical simulation |
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