泄洪洞渗漏特征研究

Study on Leakage Characteristics of Flood Discharge Tunnel

对泄洪洞开挖前后、水库蓄水前后的地下水运移变化情况进行分析,结合工程地质条件、隧洞的支护设计方案,运用工程地质分析原理对泄洪洞区地下水位变化规律进行研究,推导研究分析出库水通过泄洪洞向库外渗漏的结论,采用有限元分析计算方法对库水渗漏量进行计算、分析,指出泄洪洞区渗漏库水的主要部位是隧洞顶拱区域,提出有针对性的防库水渗漏措施方案是取消隧洞系统排水孔,为水库最优设计提供工程地质专业技术支撑。

In this paper,groundwater movement changes before and after excavation of flood discharge tunnel and before and after reservoir impounding are analyzed.In combination with engineering geological conditions and tunnel support design scheme,this paper applies engineering geological analysis principle to study the variation law of groundwater level in flood discharge tunnel area.The conclusion that reservoir water leaks out of reservoir through flood discharge tunnel is deduced and analyzed.The leakage of reservoir water is calculated and analyzed by finite element analysis and calculation method.It is pointed out that the main part of leakage reservoir water in the flood discharge tunnel area is the tunnel crest arch area.Targeted measures to prevent leakage of reservoir water are to cancel the drainage holes of the tunnel system and provide technical support of engineering geology for the optimal design of reservoir.