南门外水库防渗加固必要性与方案选择的探讨

Discussion on the necessity and scheme selection of anti-seepage and reinforcement of Nanmenwai Reservoir

本文针对南门外水库大坝现状无法蓄水运行的问题,应用单元离散化方法和二维有限元模型进行渗流有限元的计算,将工程结构、水位工况、渗透系数等设计参数分别带入模型进行计算,并对计算结果进行了对比分析,结果表明现状水平防渗铺盖长度不够是导致渗流量过大的原因。最后在分析结果的基础上,对土石坝垂直防渗方式与全库盆防渗方式的优缺点分别进行了探讨。

In order to solve the problem that the dam of Nanmenwai Reservoir is unable to store water,the element discretization method and two-dimensional finite element model are used to calculate the seepage finite element method.The engineering structure,water level working condition,permeability coefficient and other design parameters are brought into the model respectively,and the seepage flow is calculated and analyzed by the finite element numerical method of seepage.It is used as the necessity of anti-seepage reinforcement and the basis for the selection of anti-seepage reinforcement type of Nanmenwai reservoir.The calculation results are compared and analyzed,and the results show that the insufficient length of horizontal impervious pavement is the reason for excessive seepage.Finally,based on the analysis results,the advantages and disadvantages of vertical seepage control mode of earth-rockfill dam and whole reservoir basin are discussed.