Research Of En Ziping 1~# Landslide Stability In Bai Hetan Hydropower Station In Jinsha River

Bai Hetan Hydropower Station is main river to yibin jinshajiang cascade exploitation of producing thesecond level hydropower station , Is our country after three gorges, xiluodu hydropower station in the prophase work again after a million kilowatt above the giant hydropower station. En Ziping 1^# Landslide lies in Bai Hetan Hydropower Station, the downstream dam around 5km instability and failure not direct threat hub building security, also does not exist. Reservoir deposition. But, the landslide could cause waves and blocking river, on the project construction safety the influence of different level, mainly displays in: first, slippery body at a certain speed sliding into reservoir, will produce a certain height, the waves of dams and other hydraulic structures and produce certain effect; Secondly, the landslide plugging river once formed "second plugging dam" , will tail water poses a great threat to underground powerhouse.This thesis clarifies the engineering geology of Enziping 1^# slide in the downriver of Baihetan Hydropower station. Combined with the engineering practice, the specific field survey, drilling material and flat adit material, and on the basis of the morphological characteristics, from landslide composition characteristics of deformation and destruction features three aspects the basic characteristics of the summary of the landslide; Based on the perambulation, it analysed the basic character of slide, made the macroscopical judgement of the existence condition and cause of formation, and validated it with 2D discrete element simulation,Think of the landslide are mainly by sliding - shear early, middle failure process is more complicated, meanwhile may still exist, the influence of unloading effect ;Based on the analysis of the mechanism of geological model and determined after using qualitative failure modes, judgment and quantitative calculation of landslide currently possible changes in the stability and development trend analysis and evaluation, this to reduce the harm and loss landslide produce is very necessary.Comprehensive analysis, En Ziping 1^# Landsl This thesis also did the systematic analysis, caculation and estimate of the stability after sluice. As the fatalness estimate, it also analysed the stress and distortion character through 3d finite element software FLAC^3D numerical simulation. And with the above conclusions and simulated results results are compared to achieve mutual checking analyzed the effect. Based on this landslide destroying forms and failure analysis and research on the scale, identified in the event the whole sliding landslide from the special circumstances, the waves generated happened height and whether plugging river two problems based on calculation and analysis ,thus depriving harmful evaluation.The results of the study show that natural state whole stability of landslide is good, heavy rains and earthquake of landslide overall stability influence though larger, but still could satisfy the safety standards. Local stability analysis results show that En Ziping 1^# Landslide hind the terrain, the changing slope point more instability inⅠarea leading position distribution the steep slope of the location, instability modeⅢarea for destruction, the disintegration of the platform andⅡlocal slow sets become stop product place, Won't enter jinshajiang river, Calculation results show that waves near to the dam, only 0.5 m, high waves of engineering with little impact.