三峡库区白衣庵滑坡防治工程研究

Study on Baiyi′an landslide control engineering in the Three Gorges Reservoir area

白衣庵滑坡是一个以古崩滑体为主体的古、老、新滑坡组成的滑坡群。白衣阉滑坡防治工程的目标是避免暴雨或持续降雨条件下滑坡的局部复活,提高三峡水库蓄水后水位变动条件下滑坡的整体稳定性。通过3种防治工程方案比选论证,确定白衣庵滑坡的治理工程方案为地表排水、后缘削方减载和前缘填方反压。滑坡稳定性校核计算表明,治理工程实施后在特殊荷载条件下滑坡主剖面的稳定性系数达到设计标准1 15～1 2。按审查通过的工程方案分别进行了工程设计和滑坡治理工程效果监测设计。

Baiyi′an landslide is in group composed of an ancient landslide, three old landslides and three new landslides, and the ancient landslide is the main body of the landslide group. The objectvie of landslide control project is to avoid partial revival of the new landslides under rainstorm or continuons precipitation, to improve the stability of the old landslides and the ancient landslide under the condition of water level change of the Three Gorge reservoir due to water impounding.The prevention scenario of the landslide group including surface drainage cutting slope to reduce load in the upperslope and counterweight fill in the downslope, has been identified through three prevention engineering plans. The calculation of the landslide stability shows the stability coefficient of the main section could reach 115～12 times of the designed standard under special loading condition after the prevention project carries out. The engineering design and monitoring design of the landslide prevention and control have been conducted according to the engineering scenario having been approved.