三峡库区提升库水位下降速率条件下沟边上滑坡稳定性评价

Stability Evaluation of Landslide on Ditch Side for Drawdown Rate Raising in the Three Gorges Reservoir Area

摘要:

三峡库区对非汛期库水位下降速率（0.6 m/d）的严格控制，预防了近千处涉水库岸滑坡大规模下滑入江，但控制消落期库水位下降速率在某种程度上却限制了防洪和蓄水发电效益的发挥，本文主要通过研究在非汛期时候，增加库水位下落速率是否具有可行性，使用Geo-studio中的SEEP/W、SLOPE两个模块对沟边上滑坡进行渗流分析和稳定性分析评价，以计算结果来确定库水位消落期的水位下降速率，对库区调控水位下降速率的调整有重大现实意义和科学价值。

关键词:水位下降速率;消落期;渗流分析;沟边上滑坡;滑坡稳定性评价;三峡库区

Abstract:

With the tight control of the water level of the non-flood season (0.6m/d) in the Three Gorges Reservoir area, nearly 1000 landslides are prevented from a large-scale sliding into the river. However, the control of the reservoir drawdown rate in flood falling period limits the flood control and the benefits of hydroelectric power generation to a certain extent. In this paper, the feasibility of raising the reservoir drawdown rate in non-flood season is studied, Seep/W and SLOPE modules in Geo-studio are used to analyze the seepage and evaluate the stability of landslide on the ditch side. On this basis, the reservoir drawdown rate in flood falling period can be determined, which has significant practical significance and scientific value for the adjustment of drawdown rate in the Three Gorges Reservoir area.

Key words:drawdown rate; flood falling period; seepage analysis; landslide on ditch side; stability evaluation; the Three Gorges Reservoir