某水电站尾水洞出口边坡稳定性研究

The Stability Study on a Outlet Slope in Tailrace Tunnel of a Hydropower Station

某水电站尾水洞出口边坡岩体结构面相对较发育,可能会对尾水洞出口边坡造成安全威胁。在野外搜集资料调研和室内研究分析的基础上,分析了边坡的变形破坏模式,采用极限平衡方法进行评价。并在此基础上,分析了尾水洞出口边坡产生破坏的可能性。研究表明,该处边坡仅在地震状况下处于基本稳定—不稳定状态。基于以上认识,提出了相应的工程措施,为尾水洞出口边坡在各个阶段的安全保障提供了可靠的依据。

The development of structural surface on a outlet slope in tailrace tunnel of a hydropower may make a threaten to the safety of the outlet slope in tailrace tunnel. Based on data collection outside and study inside,the authors analyze the deformation and failure mode,and adopt limit equilibrium method to access. On this basis, the authors analyze the probability of failure to outlet slope in tailrace tunnel. The study shows that the slope is only in a state of flux under seismic conditions. Based on the above study,in this paper,the authors put forward the relevant engineering measures, and provide safety basis for outlet slope in tailrace tunnel in every stage.