凤滩电厂近坝库岸边坡稳定性分析与评价

Stability Analysis and Evaluation of Reservoir Bank Slope Near Dam at Fengtan Hydropower Plant

通过现场钻探揭示了凤滩电厂近坝库岸永顺镇溪边坡的地层岩性,确定了滑裂面(带),并对地形地貌特征进行了分析.根据这些工程地质条件,确定了其沿破碎带滑动的破坏模式.通过对室内岩石力学试验数据的工程处理结果、现场推剪试验结果及滑坡反分析结果,得出了边坡破碎带岩体抗剪强度综合取值为:粘聚力Cm=28.6kPa,内摩擦角φ=29.4°.取3个代表性剖面采用Sarma法对其进行稳定性分析,分析时考虑了水和地震力的影响.计算了各种工况的安全系数,根据求得的安全系数对永顺镇溪边坡进行了评价,并对其综合治理提出一些建议.

Through in-situ drilling, the strata lithology of the reservoir bank slope near dam at the Fengtan hydropower plant is introduced and landslide slip surface （zone） was determined, the terrain and geomorphic characteristic was also analyzed. According the research on the engineering geologic conditions, the possible failure style of the slope along the slip surface was gotted. Through indoor testing sludy on mechanical properties of the jointed rock and in in-situ push shear test on the structural plane of rock mass and the back analysis of the slope, each method could get a cohesion and a angle of internal friction of the rock of the researches slip surface. Through analysis comprehensively, the cohesion Cm=28.6 kPa and the angle of internal friction φ=29.4° were used to analysis the slope stability. Based on the Sarma Method, three representative sections are choose to calculate the safety factors. During the calculation, the influence of the water and the earthquake load are considered. The safety factors of all kinds of conditions are calculated. The stability evaluation is made according to the safety factors and some advices are provide for landslide control project. 5figs.,5tabs., 8refs.