柘林水电站厂房古滑坡变形监测及稳定性分析

Safety monitoring and stability analysis on old landslide at plantback slope of Zhelin Hydropower Station

柘林水电站扩建工程厂房后坡古滑坡堆积体在开挖治理过程中,古滑坡体先后因坡体前缘下被切脚和连续降雨沿基岩顶面产生了2次滑动变形,通过坡体变形监测分析和变形机理研究,及时采取了回填压脚、增设长锚杆束、加强坡体排水和严格控制下部坡体的开挖爆破等综合治理措施,及时有效地控制了坡体变形,确保了整个边坡开挖工作的顺利进行。并基于开挖治理后的滑坡体蠕滑性大,对其长期稳定性进行了分析。

In the expanding project of Zhelin Hydropower Station, for harnessing the old landslide, located behind the power plant, it was needed to cut partial toe of slope. In the process of exeavation two times of sliding failure appeared in rainy days. Based on monitoring data analysis and mechanism investigation, some synthetic countermeasures, such as, filling slope toe, adding long reinforcing anchor bars, installing slope drainage, controlling excavation blasting etc., were taken in time, and safety in construction was guaranteed. As the creep deformation of slide deposition is noticeable after excavation and harness, the longterm stability of the landslide is analysed.