The Analysis Of Left Bank Dam Abutment Slope Stability And Appraisal Of Kala Hydropower Station

Combining with Carla hydropower station in the abutment on the slope stability research subject,in the regional geological environment characteristics anddam engineering geological conditions and problems based on the analysis,using data collection and analysis,field geological investigation,testing and theory and numerical analysis,it left the abutment stratigraphic lithology,the rock mass structure and rock quality and parameters, the abutment slope rock mass stability of system analysis and evaluation,the research results obtained as follows:(1)Left bank mainly by the abutment slope Triassic miscellaneous valleybrain group of metamorphic sandstone,slate,marble constitutes . Slope upstream about the exposed steep for the F115 pour fault slope stability have no influence ,the slope of the exposed in small faults and grew up outside pour slope facing the stability of the slope structure within control function ,one of the slope to is SW main control structure surface.(2)Weak weathering with until slightly under the new and the weak unloading segment the slope rock mass structure for the slope of sloping in thick~ thick layer structure ,weak to strong weathering strong on unloading zone of slope for poured in fractured ~ chipped structure . The left side of the abutment upper failure modes for dumping bending deformation and fracture ,the failure mode for the mid-lower along to rigid structure of SW sliding surfaces of deformation and failure mode of sliding- ripping.(3)According to the classification and the fixed CSMR with SMR grading methods,On the slope rock mass quality quality grading results indicate ,inⅢ1,Ⅲ2 slope grade rock primarily ,slope rock massⅡlevel for the deep .(4)According to indoor and outdoor tests and material ,with reference to"the hydroelectric engineering geological investigation standard"comprehensive analysis ,got the slope rock mass physical mechanics parameters advisable values . (5)According to slope lithology, structure, each rock group of physical mechanics characteristics and natural slope gradient ,and design slope spatial characteristics comprehensive analysis, identified Carla hydropower station in theabutment slope excavation left than the suggested value best slope.(6)According to slope deformation damage phenomenon and failure mode, and controlling structure characteristics of weak surface comprehensively analysis ,search out slope potential unstable block;Then the geological analysis and limit equilibrium and finite element method,consider however, heavy rains, earthquake condition of the abutment design, left the excavation system slope stability analysis and calculation,the results show that the slope stability is bad, need local do appropriate reinforcement.