不同除险加固方案下病险水库渗流特性研究

Study on seepage characteristics of dangerous reservoir under different reinforcement schemes

为了给病险水库制定更加合理有效的除险加固方案。以某病险水库为研究对象,采用SEEP/W进行数值模拟,得出渗流量、出逸坡降、出逸流速、防渗墙底部渗透坡降,研究不同除险加固方案下水库的渗流特性。研究结果表明:未除险加固时,大坝渗流量、出逸坡降、出逸流速随着水位升高而增大;3种除险加固方案下,大坝渗流量、出逸坡降、出逸流速皆随着防渗墙深度的增大而降低,但防渗墙底部渗透坡降先降低后增大;大坝渗流量、出逸坡降、出逸流速相比加固前都显著降低,能满足控渗要求;值得注意的是,加固后防渗墙底部渗透坡降较大(0.429~2.17),应重点考虑。

In order to make a more reasonable and effective reinforcement scheme for the dangerous reservoir,taking a dangerous reservoir as the research object,the numerical simulation was carried out by SEEP/W.The seepage quantity,outflow gradient,outflow velocity and seepage gradient at the bottom of cutoff wall were calculated,and the seepage characteristics of dangerous reservoir under different reinforcement schemes were studied.The results showed that before the reinforcement,the seepage quantity,outflow gradient and outflow velocity of dam increased with the increased of water level.Under the three reinforcement schemes,all the seepage quantity,outflow gradient and outflow velocity of dam decreased with the increased depth of cutoff wall,but the seepage gradient at the bottom of cutoff wall decreased first and then increased.After adopting three reinforcement schemes,the seepage quantity,outflow gradient and outflow velocity of dam reduced significantly compared with those before reinforcement,which could meet the requirements of seepage control.It was worth noting that the seepage gradient at the bottom of cutoff wall was relatively large(0.429~2.17)after reinforcement,so it should be considered with emphasis.