库水位升降作用下库岸滑坡稳定性研究

为研究库水位升降对库岸滑坡稳定性的影响,以九甸峡库区某滑坡为例,采用GPS对其外部进行变形监测,结合详细的现场调查及水库运营资料,同时针对库水位升降条件下利用Geo-slope分析库岸滑坡的稳定性变化规律.结果表明:库水位100~130 m阶段,库水位快速持续上升及下降将会引起滑体发生滑动;滑体稳定性随库水位下降速度增加而减小,库水位下降速度超过0.3 m/d时,滑体将会发生失稳;库水位上升速率大于0.4 m/d时,将会诱发滑体失稳;库水位连续快速升降也对库岸滑坡稳定性不利,库水位快速升降与滑体滑动存在滞后期.

Stability Studies of Reservoir Landslide Under Reservoir Water Level Fluctuation

For studying the influence of reservoir water fluctuation on reservoir landslide stability， taking a landslide in Jiudianxia reservoir area as an example， the external deformation of landslide is monitored by GPS， and the change law of landslide stability is analyzed in combination with detailed field investigation and reservoir operation data， which is also numerically analyzed by Geo-slope as well. The results show that the landslide has three fast movements in phase of 100~130m， and continuous rapid water rise and fall will trigger landslide movement. The landslide stability decreases with the increase of water fall speed， and the landslide will occur if water fall speed is more than 0.3m/d. The landslide also will occur when water rise speed is more than 0.5m/d. The landslide movement presents a typical time-dependent characteristics， and a lag time can be identified between rapid water fluctuation and landslide movement.