Sichuan Jinjiang Landslide Stability Analysis And Treatment Scheme

Hydro power station is located in Jinsha River,is second only to the Three Gorges Hydropower Station,China's second largest hydropower station.Jin Jiang landslide is massive landslide in the upstream of the dam,the volume reached 250 million m3.The landslide is stable or not directly affect the normal operation of the dam and reservoir safety,the main problems: First,the slider slides into the reservoir at a certain speed,it will definitely have a certain degree of swell of dams and other hydraulic structures produce some influence;secondly,slide landslide reservoir sedimentation problems caused by the library.This paper clarifies the hydropower station dam upstream of Jinjiang landslide engineering geological conditions,combined with the specific engineering practice in the field field surveys,drilling data and basic information on the adit from landslide morphology and composition of the material deformation and failure characteristics are summarized in three aspects of the basic characteristics of the landslide;proceed from the landslide formation conditions,analysis to determine its genetic mechanism,and three-dimensional numerical simulation of the genetic mechanism to verify that the landslide was buckling-type sliding failure;determine the geological model and failure modes based on genetic mechanism analysis,the qualitative analysis and quantitative calculation of the current landslide stability and possible development trends analysis and evaluation,which reduces damage and loss landslide it is necessary of.The qualitative analysis and limit equilibrium method and other methods,the overall stability of the landslide,local stability and the stability of reservoir water after systematic analysis,calculation and evaluation,and three-dimensional finite element softwareFLAC3D numerical simulation of stress field in the landslide as well as deformation and failure characteristics were analyzed,and the simulation results with the above conclusions and the results were analyzed,in order to achieve mutual check results.The results showed that the overall stability of Jinjiang landslide natural state is better,plus normal water slide with local seismic conditions affected more slip surface stability,overall the whole is stable.Through analysis of local stability,Jinjiang landslide may exist in the local bank collapse in the water,instability volume of about6 million m3.After the team landslide slope take slag heap pressure processing,we can ensure local shallow stability under extreme conditions.