Stability Assessment To The Qingdagou Intake Slope Of Lianghekou Ydroelectric Power Station

Two middle and lower reaches of the Yalong River Hydropower Station is the controlling power plant reservoir engineering,the whole cascade Yalong tremendous impact on the development of power plants.In an upstream tributary of the left bank of the Yalong river near Mizonokuchi-Left Slope site layout a diversion tunnel,the spillway,such as emptying discharge structure of imports.The slope deformation obviously,with the exception of the shallow existence of large-scale dumping of bending-Latin America fissile body,there are still deep disposal of fissile-Hela and creep deformation phenomenon.Slope project to study the mechanisms of deformation and damage,assessment of slope stability,the slope of the project design and reinforcement to ensure the normal operation of power plants,and so have important practical significance.This paper in-river intake slope of the basic geological conditions,the slope rock structure, deformation and fracture on the basis of signs,and so on,the slope of the patterns and causes deformation and damage mechanisms for analysis and the establishment of mechanisms of deformation and damage its conceptual model.Use of rigid limit equilibrium theory of slope stability calculation and assessment.UDEC using two-dimensional discrete element of its software to simulate the deformation process,verification of its deformation and damage. FLAC3D use of three-dimensional finite difference software excavation of the slope before and after the stress and strain of simulation and analysis of slope stability.According to deformation of different parts of deformation,the depth of excavation,stable conditions and other factors to the corresponding measures proposed.Details and results are as follows:(1)of the field survey data,more comprehensive summed up the slope-river intake structure of the rock,and initially established a geological model.Slope quality will be divided intoâ…¢,â…£andâ…¤category,and the major categories toâ…£andâ…¤mainly at the same time,the structure of divided intoâ…¢,â…£,â…¤-level structure,and its characters features a detailed description of According to the slope failure mode and the extent of deformation,deformation will be divided into the main bodyâ… ,â…¡,â…¢,â…£four areas,respectively,on the district deformation features and analysis of the causes of the deformation mechanism.That the slope at the bottom of metamorphic rock major TLC siltstone control,in the long-term physical effects,TLC metamorphic siltstone in damage,to improve conditions for the invading front,with the valley of the incision,cutting degree slope terrain And the slope of the increase,leading to the upper-plate in the dumping grounds of deformation. (2)through the geological analysis and judgement,to elaborate on the possible instability of the adverse combination of block model and adopt the ultimate balance of the project slope stability of the overall calculation and assessment.The results show that the slope of the overall stability of the main controlled by fb13-4,fb13-6 and f6,there to the end of fb13-4 for the sliding surface to fb13-6 or f6 for the post-edge fracturing of the block damage,The poor stability of the natural condition,in heavy rain or earthquakes and other adverse condition vulnerable instability. A randomized block Chek projection analysis of the partial block slope stability analysis and evaluation.The results show that the slope face-to-formâ‘£cracks or fissuresâ‘¢the end of the sliding surface to crackâ‘ orâ‘¡margin for the post-fracturing of the block were damaged.No adverse side-slope of portfolio structure,its good stability.(3)UDEC discrete two-dimensional element software on the slope deformation process of numerical simulation,from stress,displacement,and crack open displacement vector analysis of the situation in different natural step when calculating the deformation characteristics,and increase the monitoring points Excavation of the slope of the displacement monitoring the situation,quantitative analysis of the slope after the excavation of the deformation and then a stability evaluation.Evaluation results showed that the slope excavation,there are still at the bottom with a plate of dumping grounds-bending deformation,a top-level slip fracturing damage failure mode.(4)use of finite difference FLAC3D fast Lagrangian procedures to simulate the slope, calculated slope in the excavation before and after the stress and strain,shear strain increment and plastic area,and to analyse its stability.The results show that the fault in the vicinity of a plastic zone and shear strain increment zone,its poor stability.(5)in the field of geological analysis,based on the results of the foregoing,the slope stability comprehensive evaluation,based on the evaluation results,the slope corresponding to different parts of the prestressed cable,anchored Pile,protection and drainage networks,such as Targeted measures proposed.