西藏大古水电站冰水堆积体稳定性研究

冰水堆积体位于大古水电站选坝河段, 其规模巨大, 一旦发生失稳, 将直接影响坝址水工建筑的安全。根据现场地质调查, 分析堆积体物质组成及结构特征, 建立地质计算模型, 采用极限平衡分析方法, 计算堆积体稳定性, 计算结果表明, 冰水堆积体整体处于稳定-基本稳定状态, 前缘局部存在失稳的可能, 对坝址影响较小, 计算结果为边坡开挖及支护提供了科学的依据。

REASEARCH ON STABILITY OF OUTWASH DEPOSITS OF XIZANGDAGU HYDROPOWER STATION

Outwash deposits is located in the dagu station dam selection, the scale is huge, once the failure will directly affect the safety of dam construction. According to the field geological survey, analysis of Material composition and structure characteristics, the establishment of geological model, calculated its stability by limit equilibrium method, calculation results show that, outwash body as a whole is in a stable～basically stable state, the leading edge of the existence of local instability, to the dam site less affected, that can provide scientific basis to slope excavation and supporting.