Plain reservoir plays an important role in alleviating water shortage in plain areas which are generally crowded with large populations. As an effective and cheap anti-seepage measure, geomembrane is widely applied in plain reservoirs. Therefore, it is necessary to investigate the seepage discharge caused by composite geomembrane leakage. The laboratory test and numerical calculation are carried out in this paper to analyze the influence of three factors (i.e., water head, leakage size, and leakage location) on seepage discharge. It is found from the results of the orthogonal and single-factor analysis that the impact order of the three factors on the seepage discharge of plain reservoir is: distance from dam toe > water head > leakage size. Moreover, the seepage discharge increases as the water head, leakage size, and leakage quantity increase, in a linear relation. The opposite trend can be sawed in the seepage discharge when the distance from dam toe rises. Furthermore, a threshold distance is innovatively presented based on the results of numerical analysis. The ranking of three factors has enlightening significance for future scholars to track and study key issues of the leakage of composite geomembrane. The threshold distance presented in this paper is beneficial for engineers to manage and maintain the reservoir. Generally, the findings of this study can be beneficial to deepen the understanding of the influence of composite geomembrane leakage on the plain reservoirs.

中文翻译：

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复合土工膜在平原水库渗漏的室内试验与数值模拟

平原水库在缓解平原地区普遍人口众多的水资源短缺方面发挥了重要作用。作为一种有效且廉价的防渗措施，土工膜广泛应用于平原水库。因此，有必要对复合土工膜渗漏引起的渗流排放进行研究。本文通过室内试验和数值计算，分析了水头、渗漏大小、渗漏位置三个因素对渗流排放的影响。从正交和单因素分析结果发现，三个因素对平原水库渗流量的影响顺序为：距坝趾距离>水头>渗漏量。此外，渗流量随着水头、泄漏量、泄漏量呈线性关系。当距坝趾距离增加时，渗流排放量呈现出相反的趋势。此外，基于数值分析的结果，创新地提出了阈值距离。三个因素的排序对未来学者追踪和研究复合土工膜渗漏的关键问题具有启发意义。本文提出的阈值距离有利于工程师管理和维护油藏。总的来说，本研究结果有助于加深对复合土工膜渗漏对平原水库影响的认识。基于数值分析的结果创新性地提出了阈值距离。三个因素的排序对未来学者追踪和研究复合土工膜渗漏的关键问题具有启发意义。本文提出的阈值距离有利于工程师管理和维护油藏。总的来说，本研究结果有助于加深对复合土工膜渗漏对平原水库影响的认识。基于数值分析的结果，创新地提出了阈值距离。三个因素的排序对未来学者追踪和研究复合土工膜渗漏的关键问题具有启发意义。本文提出的阈值距离对工程师进行管理和维护油层很有帮助。总的来说，本研究结果有助于加深对复合土工膜渗漏对平原水库影响的认识。