基于测压管实测水位的王甫洲水利工程复合土工膜工作性态反馈  

Feedback on work behavior of composite geomembrane in Wangfuzhou hydraulic project based on measured piezometric level

作　　者：黄耀英[1] 谢同 费大伟 包腾飞[2] 颜剑 HUANG Yao-ying;XIE Tong;FEI Da-wei;BAO Teng-fei;YAN Jian(College of Hydraulic&Environmental Engineering,China Three Gorges University,Yichang 443002,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210024,China;Hubei Hanjiang Wangfuzhou Hydropower Co.,Ltd.,Xiangyang 430048,China)

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002 [2]河海大学水利水电学院,江苏南京210024 [3]湖北汉江王甫洲水力发电有限责任公司,湖北襄阳430048

出　　处：《岩土工程学报》2021年第3期564-571,共8页Chinese Journal of Geotechnical Engineering

基　　金：国家重点研发计划项目(2018YFC0407103)。

摘　　要：基于王甫洲水利工程近20a的渗流监测资料,对复合土工膜的防渗工作性态进行反馈分析。首先对围堤土石坝整体渗流性态进行定性分析;然后选取典型断面建立测压管水位统计模型进行定量分析;接着采用正交设计–神经网络-数值计算相结合的方法,反演复合土工膜的渗透系数;最后对复合土工膜工作性态进行综合分析。研究表明,测压管实测水位仅在蓄水运行初期出现较大变幅,目前变化较平稳;典型GY5断面中3支测压管的实测水位和分离出的时效分量均呈逐渐减小的趋势;基于实测水位反演获得的复合土工膜渗透系数为1.11×10^(-10)cm/s;综合分析认为王甫洲水利工程复合土工膜经过约20 a的服役,防渗效果依然良好且没有明显的老化趋势。The feedback analysis of anti-seepage behavior of composite geomembrane is performed based on nearly 20 years of seepage monitoring data from Wangfuzhou hydraulic project. Firstly, the qualitative analysis of the overall seepage behavior of the embankment earth-rock dam is carried out. Then a typical section is selected to establish the statistical model of piezometric level for quantitative analysis. Subsequently, the orthogonal design, neural network and numerical method are combined to invert the permeability coefficient of the composite geomembrane. Finally, the work behavior of the composite geomembrane is analyzed comprehensively. The results show that the piezometric level only changes greatly at the initial stage of water storage and operation, and the change is relatively stable at present. Additionally, it is found that the piezometric level and separated time-dependent components of three piezometers in the typical GY5 section decrease gradually. At the same time, the permeability coefficient of the composite geomembrane inverted by the piezometric level is 1.11×10-10 cm/s. The comprehensive analysis shows that the composite geomembrane of Wangfuzhou hydraulic project still has good anti-seepage behavior after nearly 20 years of service, and there is no obvious aging trend.

关 键 词：复合土工膜 渗流性态 测压管水位 统计模型 参数反演 

分 类 号：TU431[建筑科学—岩土工程]