Studying On The Stability Of The High And Steep Rocky Slope At The Right Bank Of Anterior Dam In Pubugou Hydraulic Power Station

The rock mass of the high and steep rocky slope is encountered many times geology function, undergoing distorts, destroys and forms certain mineral, structure geologic body, which is in certain geolog-ical environment. The distortion and destruction is a complex, irreversible, the dynamic diffusion process. The influence factors of the high and steep rocky slope are terrain landform, geologic structure, lithology, rock mass structure, characteristic of structural plane, crustal stress and water.During or after forming the high and steep rocky slope, the slope is encountering epigenetic reformation. The unstability of the slope includes distortion and destruction. There are not penetration failure plane in the slope is called distortion, which include loose and creep. The destruction includes falling, slip, toppling, buckling and tensile. The unstability model of the unstable high steep rock slope includes creeping-tensile, slip-pressuring-tensile, slip-tensile, curving-tensile, flowing-tensile, slip-curving, slip tensile-shearing, stepped creeping-tensile, compressing-toppling-tensile, compressing-toppling-swaying shearing inflation, high stress-strong discharge deep tensile. In addition, the above pattern may combines in the time or the space, constitution combination pattern.The thesis takes the right bank slope of Pubugou hydro-electric station as models to study the stability of the high and steep rocky slope. And the stability is analysed simulatively and evaluated by using finite element program-plaxis8.2. The result indicates: The epigenetic reformation is the main control factor to influence the stability of the right bank tensile slope of Pubugou hydroelectric station. From surface to deep of slop, the rock mass is loose area, toppling-tensile area, slip-tensile area or slip-pressuring-tensile, deep tensile area. The distortion destruction is slip-falling of slope surface, shallow area toppling-tensile of slop, slip-tensile or slip-pressuring-tensile and deep tensile in weak discharge area.There are different distortion or destruction forms and models in different area of the right bank slope of Pubugou hydroelectric station, so we must takes the different processing technical to deal with them. The main wethod to deal with them is combined steel net-shotcrete and Frame, System -bolt, cable. The design parameter of cable is adjusted according to the actual situation of each area. But construction must satisfy the design. And we must complete the waterproof measure to aviod lead to unsteadily of the tensile slope by construction.