王甫洲水利工程复合土工膜渗透系数时变特性反演分析  

Inverse analysis on time-varying characteristics of permeability coefficient of composite geomembrane for Wangfuzhou Water Control Project

作　　者：何一洋 黄耀英[1] 费大伟 高大水 杨明化 HE Yiyang;HUANG Yaoying;FEI Dawei;GAO Dashui;YANG Minghua(College of Hydraulic&Environmental Engineering,China Three Gorges University,Yichang 443002,Hubei,China;Anhui Jixi Pumped Storage Co.,Ltd.,Jixi 245300,Anhui,China;Changjiang Institute of Survey,Planning,Design and Research,Wuhan 430010,Hubei,China)

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002 [2]安徽绩溪抽水蓄能有限公司,安徽绩溪245300 [3]长江勘测规划设计研究有限责任公司,湖北武汉430010

出　　处：《水利水电技术（中英文）》2022年第8期112-120,共9页Water Resources and Hydropower Engineering

基　　金：国家重点研发计划项目(2018YFC0407104);国家自然科学基金资助项目(51779130,52179135)。

摘　　要：针对室内土工膜老化试验和现场土工膜性能检测难以反映实际工程复合土工膜整体时变性态的问题,结合王甫洲水利工程围堤土石坝典型监测断面近20 a渗流监测资料对复合土工膜时变特性进行研究。首先按照复合土工膜的服役年限对防渗断面实测渗流资料进行时间分段;然后采用“正交设计-数值计算-支持向量机-粒子群优化算法”相结合的方法,逐一反演得到不同时间段内土工膜的渗透系数;最后建立土工膜渗透系数时变效应模型并分析了土工膜渗透系数的时变特性。结果显示:土工膜渗透系数时变效应模型与反演获得的土工膜渗透系数平均误差为8.39%,可较好地反映土工膜渗透系数的时变规律;反演获得的复合土工膜渗透系数从运行初期的1.00×10^(-11)cm/s增长到了1.50×10^(-10)cm/s,增长速率逐渐减小,表明目前复合土工膜渗透系数变化处于相对稳定状态。Aiming at the problem that it is difficult to reflect the overall time-varying behavior of the composite geomembrane in actual project through indoor geomembrane aging test and in situ performance test of geomembrane, the time-varying characteristics of the composite geomembrane is studied herein in combination with the seepage monitoring data of recent 20 years from the typical monitoring section of the embankment earth-rock fill dam for Wangfuzhou Water Control Project. At first, the time division of the measured seepage data of the anti-seepage section is made in accordance with the service years of the composite geomembrane, and then a method combining orthogonal design, numerical calculation, support vector machine and particle swarm optimization is adopted to invert and obtain the permeability coefficients in different time phases one by one, and the time-varying effect model is established and the time-varying characteristics of the permeability coefficient of the geomembrane is finally analyzed. The study result shows that the mean error of the permeability coefficient between the time-varying effect model of the geomembrane and that obtained from the inversion is 8.39% and can better reflect the time-varying law of the permeability coefficient of the geomembrane. The permeability coefficient of the composite geomebrane obtained from the inversion increases from 1.00×10^(-11)cm/s during the initial operation stage to 1.50×10^(-10)cm/s with a gradual decrease of the increasing rate, which indicates that the change of the permeability coefficient of the composite geomembrane is relatively stable at present.

关 键 词：复合土工膜 渗透系数 测压管水位 时变特性 参数反演 

分 类 号：TU431[建筑科学—岩土工程]