平原水库复合土工膜缺陷渗漏影响因素数值分析  

Numerical Analysis of Factors Affecting the Leakage of Composite Geomembrane Defects in Plain Reservoir

作　　者：刘健 邵燕妮 李昱莹 齐敏敏 LIU Jian;SHAO Yanni;LI Yuying;QI Mingming(School of Qilu Transportation,Shandong University,Jinan 250061,Shandong,China;School of Civil Engineering,Shandong University,Jinan 250011,Shandong,China;Beijing Tongzhou District Housing and Urban-Rural Construction Committee,Beijing 101100,China)

机构地区：[1]山东大学齐鲁交通学院,山东济南250061 [2]山东大学土建与水利学院,山东济南250011 [3]北京市通州区住房和城乡建设委员会,北京101100

出　　处：《水力发电》2019年第10期49-52,69,共5页Water Power

基　　金：国家科技支撑计划资助项目(2015BAB07B05);国家自然科学基金资助项目(41172267);山东省重点研发计划项目(2019GSF111040);国家科技支撑计划资助项目(2015BAB07B00)

摘　　要：使用Flac3d数值模拟软件,以南水北调东线大屯水库为原型,建立平原水库复合土工膜缺陷渗漏数值计算模型,分析缺陷孔径、位置、水头高度及多缺陷联合作用对平原水库实际工程渗漏量的影响。结果表明:数值计算结果和室内试验结果吻合度较高,可用于实际工况分析;复合土工膜缺陷的数量和水头高度是影响复合土工膜缺陷渗漏的主要因素,其次为缺陷尺寸、缺陷间距和缺陷位置;复合土工膜缺陷尺寸较小和距坝脚较远时对复合土工膜缺陷渗漏量影响较小;复合土工膜缺陷渗漏量随缺陷数量和库水位的增加呈线性增长的趋势,当缺陷距坝脚小于100 m,且缺陷尺寸大于10 mm,同时缺陷间距较小时,应重点排查修补。Taking the Datun Reservoir in the east route of the South-to-North Water Transfer Project as study object,a calculation model about the defect leakage of composite geomembrane in plain reservoir is established by Flac3d to investigate the influences of defect size,defect location,head height and multi-defects on actual engineering leakage of plain reservoir.The calculation results show that:(a)the numerical calculation results are in good agreement with indoor test results and can be used for actual operation condition analysis;(b)the number of composite geomembrane defects and head height are the main factors affecting the leakage of composite geomembrane defects,followed by defect size,defect spacing and defect location;(c)the defect which is small or relatively far from the dam toe has a less effect on the leakage of composite geomembrane;and(d)the seepage quantity of defective composite geomembrane shows a liner growth trend with the increase of defect number or reservoir water level,so the defects of composite geomembrane should be repaired when the defect is located less than 100m from the dam toe,the defect size is greater than 10 mm and the defect spacing is smaller at the same time.

关 键 词：复合土工膜 缺陷 渗漏量 数值模拟 平原水库 

分 类 号：TV861[水利工程—水利水电工程]