水库库盘防渗土工膜下气压分布规律研究  

Study on Pressure Distribution Law under Impermeable Geomembrane in Reservoir Pan

作　　者：孟杰[1] Meng Jie(Shanxi Provincial Water Conservancy&Hydropower Investigation,Design and Research Institute Limited Company,Taiyuan 030024,China)

机构地区：[1]山西省水利水电勘测设计研究院有限公司,太原030024

出　　处：《黑龙江水利科技》2025年第2期135-139,共5页Heilongjiang Hydraulic Science and Technology

摘　　要：膜下非饱和土体孔隙内气体压力的增大对水库全库盘防渗土工膜结构的安全与稳定存在不利影响。考虑到应用理论公式直接计算库盘防渗膜下气体压力过程的复杂性,在进行土体参数、边界参数、模型参数代换后,采用热传导商业计算软件辅助求解水库库盘防渗土工膜下土体孔隙内气体运移;对不同地下水升高值下膜下气体压力分布规律以及排气沟间距设置效果展开模拟分析。结果表明,全库盘土工膜防渗体系建立后入渗水和地下水之间近似形成封闭气体空间,地下水位升高必然造成防渗土工膜鼓胀;膜下气压随地下水位的升高而增大;按照75m间距设置排气沟,既能减缓地下水位升高期间膜下气压增大趋势,通过膜下气体运移较好消除土工膜鼓胀,又能节省工程量,指导水库全库盘防渗工程实践。The increase of gas pressure in the pores of unsaturated soil under the membrane has an adverse effect on the safety and stability of the impermeable geomembrane structure of the whole reservoir pan.Considering the complexity of the process of directly calculating the gas pressure under the impermeable membrane of reservoir by using the theoretical formula,the heat transfer commercial calculation software is used to solve the gas transport in the pores of soil under the impermeable membrane of reservoir pan after the parameter of soil parameter boundary parameter model is replaced.The distribution law of gas pressure under the membrane and the setting effect of exhaust ditch spacing under different groundwater rise values were simulated and analyzed.The results show that a closed gas space is approximately formed between the seepage water and groundwater after the establishment of the Quankupan geomembrane anti-seepage system,and the rise of the groundwater level will inevitably cause the geomembrane bulge;the pressure under the membrane increases with the rise of the water level;setting the exhaust ditch at 75m interval can not only slow down the trend of pressure increase under the membrane during the rise of groundwater level,eliminate the geomembrane bulge through gas migration under the membrane,but also save the engineering amount,and guide the seepage prevention engineering practice of the whole reservoir pan.

关 键 词：水库 库盘 防渗土工膜 气压分布 排气沟 

分 类 号：TV223.4[水利工程—水工结构工程]