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本文采用三维数值模拟计算,分析了蒲石河抽水蓄能电站各种运行工况下上水库渗漏量大小及渗流场的分布特征。对各防渗方案进行三维渗流敏感性分析,主要考虑防渗帷幕深度和厚度发生变化时对渗流场及渗漏量的影响。结合水库-岩体系统地下水运动规律和上水库渗漏量的计算分析,针对不同的设计防渗方案进行分析、评价及优选。结果表明,上水库防渗设计首选方案为大坝基础进行帷幕灌浆,沿趾板布置一排防渗帷幕,帷幕深度为基岩透水率3Lu线以下5m,帷幕灌浆孔距为2m。该防渗方案不仅能够保证水库大坝的安全、经济、稳定运行,而且水库渗漏量为可接受的渗漏量,是合理、最优的防渗方案。
In this paper, three-dimensional numerical simulation is used to analyze the distribution of seepage and the seepage of the upper reservoir under various operating conditions of the Pushihe pumped storage power station. The three-dimensional percolation sensitivity analysis of each seepage control scheme is mainly taken into account when the depth and thickness of the anti-seepage curtain change and its influence on the seepage field and seepage volume. According to the calculation and analysis of groundwater movement and reservoir leakage of reservoir-rock system, different schemes of seepage control are analyzed, evaluated and optimized. The results show that the preferred scheme for the seepage prevention design of the upper reservoir is curtain grouting for the foundation of the dam, a row of anti-seepage curtains are arranged along the toeboard, the depth of the curtain is 5m below the 3Lu water permeability of the bedrock, and the hole spacing of the curtain grouting is 2m. The seepage control scheme can not only ensure the safety, economy and stable operation of the reservoir dam, but also the seepage amount of the reservoir is an acceptable amount of leakage, which is a reasonable and optimal anti-seepage plan.