水电站地下厂房渗控效应的敏感性分析

Sensitivity analysis of seepage control effects on underground powerhouse

地下厂房多位于降雨形成的天然水位线以下,渗漏成为主要问题,不仅影响厂房的正常运行,还可能对厂房的安全造成极大的危害。文章采用有限元数值模拟方法,开展了地下厂房在不同防渗帷幕和排水系统组合失效工况下渗控效应的敏感性分析;通过多工况的计算,详细评价了水电站厂区防渗排水措施的渗控效果,从而为工程建设提供合理依据。计算结果表明:防渗帷幕能够有效减小渗流量、降低厂房区的自由面,排水系统排水减压效果明显,采取渗流控制措施后厂房洞室渗流场得到了很好的控制。

Underground powerhouse used to be located under rainfall-induced natural water level ,as a result leakage becomes a major problem .It affects the normal operation of underground powerhouse , and may cause a great threat to the safety of plant .Sensitivity analysis of the seepage control effects on underground powerhouse with different combinations of impervious curtain and drainage system is conducted by adopting the finite element method .According to calculation results under different op-erating conditions ,seepage control effects of the measures of anti-seepage and drainage are evaluated , w hich can provide reasonable reference for the engineering construction .T he results indicate that im-pervious curtain can effectively reduce the seepage flow and lower the free surface .As a result ,the decompression effects of drainage system are obvious ,w hich means that the measures for controlling seepage field of underground caverns achieve good results .