【作者】 刘志军；

【导师】 黄润秋；

【作者基本信息】 成都理工大学 ， 地质工程， 2004， 硕士

【摘要】 云南省澜沧江小湾水电站位于云南省南涧县和风庆县的交界处，最大拟建坝高292m，装机容量420万千瓦，属特大型水电工程。左岸砂石系统边坡位于澜沧江左岸8~#山梁，主体开挖高度达80m，开挖对边坡的稳定性产生很大的影响。该边坡的稳定性对水电工程建设的顺利进行。对水库的正常运作都有重要的意义。 本文阐明了左岸砂石系统边坡区域地质环境，并详细研究了边坡的工程地质条件。对边坡的岩体结构和已经产生的变形破坏现象进行了详细的调查和分析，对边坡破坏的形成机制进行了分析，阐明了边坡可能的变形破坏模式。在对监测资料进行汇总分析的基础上，阐述了边坡开挖对边坡稳定性的影响。利用数值模拟手段对边坡的稳定性进行分析计算。最后，结合地质判断、监测分析结果及数值模拟分析结果以及对典型剖面的极限平衡计算结果，得出了以下主要成果： (1)通过对“左砂”边坡变形破坏迹象的跟踪调研，对斜坡的岩体结构和已经发生的破坏迹象进行深入的研究分析，结合对监测资料的综合分析，确定了“左砂”边坡可能的变形破坏模式。 (2)对典型剖面进行二维FLAC数值模拟，分析了开挖前、后边坡内的应力、位移特征，得出了“左砂”边坡变形趋于结束的结论。 (3)对“左砂”边坡进行三维FLAC数值模拟，并对结果进行综合分析，确定了开挖工程对边坡稳定的影响程度及影响范围，对边坡以后的稳定进行预测。 (4)对典型剖面进行极限平衡计算，说明了“左砂”边坡的整体稳定性较好更多还原

【Abstract】 Abstract: Xiao wan hydroelectric installation locate in the boundary between Nanjian County and Fengqing County of the western of YunNan province .The height of dam is 292 m,and its installed capacity is 4,200,000 kilowatt,so it’s a large-scale water-power engineering.The height of excavation reach to 80 m.So it is sure,that the excavation will influence on the stability of the slop.The stability of the slop is the necessary condition to assure the trouble-free operation of the station.This thesis expound the area geologic environment of the station and the engineering geologic environment of the slop.This thesis do a lot of survey and analysis about the structure of the rock mass and the destroyed phenomenon of the slop.lt analyse the formation of the destruction and expound the model of the destruction of the slop.On the basis of the analysis of the monitoring data,it expound the influence of excavation to the stability of the slop. It analyse the stability with numerical simulation.Finally,on the basis of geological estimation and analysis of the monitoring data and the numerical simulation,it conclude:(1) Through the tracking investigation of the deformation phenomenon,and the study of the rock mass constructure of the slop,it determine the mode of the formation and destruction on the basis of aggregate analysis of the monitoring data.(2) Through two-dimesional numerial simulation of the typical profile,it analyse the stress state and the displacement state before excavation and after excavation.It conclude that the deformation of the slop is driving to finish..(3) Through three-dimensional numerial simulation of the slop,the incidence of the excavation is determined.The result of the simulation forecast the stability of the slop. And the result indicate that the deformation of the slop is driving to finish.(4) Through the limiting equilibrium calculate for the typical profiles the result indicate that the resistance to overturning of the slope is good.更多还原