近坝库岸古滑坡体稳定性及其对大坝安全的影响研究

Stability Study of an Ancient Landslide at Reservoir Bank near Dam and Its Impact on Dam Safety

老挝南欧江六级水电站库区近坝库岸古滑坡体在蓄水后是否稳定将影响到水电站建筑物安全和电站的正常运行。在对滑坡体进行定性工程地质评价的基础上,分别采用强度折减法和安全系数法对滑坡体稳定性进行定量分析,并据此搜索潜在滑块,估算不稳定滑块方量后,开展涌浪影响定量分析,以评价滑坡体稳定性对大坝安全的影响。在老挝Xe-PianXe-Namnoy水电站溃坝事故背景下,对当地开展大坝安全检查具有一定的借鉴意义。

The stability of an ancient landslide at reservoir bank near dam in Nam Ou 6 Hydropower Station in Laos after reservoir water storage will affect the safety of station s hydraulic structures and the normal operation of station. Based on qualitative engineering geological evaluation, the quantitative analyses of slope stability are carried out by strength reduction method and safety coefficient method respectively. The potential sliding bodies are searched and the volume of unstable sliding bodies is estimated. After that, the impact of water surge on landslide stability is quantitatively analyzed for evaluating the impact of landslide stability on dam safety. Under the background of the dam failure of Xe-Pian Xe-Namnoy Hydropower Station in Laos, it has certain reference significance for local dam safety inspection.