卜寺沟水电站库坝址区坠落式危岩体稳定性评价

卜寺沟水电站库坝址区有29处坠落式危岩体，为此选择左坝肩边坡ZBJ-07典型坠落式危岩体为研究对象，针对该危岩体工程地质条件，从定性角度采用赤平投影图解法初步判断可能的失稳破坏区域，再从定量角度采用悬臂梁理论找到该危岩体破坏的最危险点，进而评价出自然状态、暴雨及地震状态下的ZBJ-07危岩体均处于不稳定状态。采用与ZBJ-07坠落式危岩体相同的方法评价了另28处坠落式危岩体。结果表明，卜寺沟水电站库坝址区坠落式危岩体有8处基本稳定，可不处理；21处不稳定或欠稳定，应予以清除。

Stability Evaluation of Falling Dangerous Rock Mass in Reservoir Dam Site Area of Busigou Hydropower Station

There are 29 falling dangerous rock mass at the dam site area of Busigou hydropower station. The ZBJ-07 typical falling dangerous rock mass on the slope of left abutment was selected in the article as the research object. According to the engineering geological condition of the dangerous rock mass, stereographic projection method is adopted to prejudge the possible unstable failure area qualitatively. And then it finds the most dangerous point of the dangerous rock mass quantitatively based on the cantilever beam theory. It proves that the ZBJ-07 dangerous rock mass is in unstable state under the natural, rainfall and earthquake condition. Finally, the same method is applied to evaluate another 28 falling dangerous rock mass. The results show that in reservoir dam site area of Busigou hydropower station, there are 8 rock mass are basically stable, which can not be treated; 21 rock mass are basically unstable or less stable, which should be removed.