帷幕灌浆及充填灌浆对水库除险加固的影响研究

Study on the Effect of Reservoir Danger Control and Reinforcement by Curtain Grouting and Filling Grouting

土石坝渗漏破坏是病险水库中最常见的病种之一,设计及施工中应严格控制大坝渗流量及渗透坡降。针对烟庄水库渗漏问题,坝体采用粉质黏土充填灌浆、坝基采用帷幕灌浆技术进行防渗加固处理。采用两种有限元分析软件对土石坝进行数值模拟计算,对比分析两种软件计算的大坝渗流量、防渗墙底部坡降、出逸坡降,分析灌浆加固后土石坝的渗流及稳定特性。研究结果表明,粉质黏土充填灌浆、帷幕灌浆技术结合使用能有效降低大坝渗流量、抑制防渗墙底部渗透坡降、出逸坡降;加固后的土石坝渗流特性、坝体上下游边坡稳定性在各种工况下皆符合渗透稳定要求。其研究结果可为类似土石坝除险加固工程提供理论依据及技术参考,具有一定的实际应用价值。

Seepage failure of earth-rock dam is one of the most common diseases in the dangerous reservoir,seepage discharge and seepage gradient should be strictly controled in design and construction. According to the seepage failure of YANZhuang Reservoir,silty clay filling grouting reinforces the dam body,curtain grouting reinforce the dam foundation. And the earth-rock dam is numerical simulation calculated by two finite element softwares,comparatively analysing the seepage discharge and the seepage gradient on the bottom of dam foundation and exit gradient which are cuculated by this two finite element softwares,and analysing the seepage and stability of earth rockfill dam after grouting reinforcement. The research resoult show that the combination silty clay filling grouting and curtain grouting can effective reduce the seepage discharge of dam and inhibit the seepage gradient on the bottom of dam foundation and exit gradient. The seepage characteristics and slope stability of dam meet the stability requirements under every conditions. This resoult of research can provide theoretical basis and technical reference,which has a certain engineering significance.