Gorge Reservoir Assessment Of Operations And Reinforcement

A river basin of Gansu province is temperate semi-humid climate, abundant rainfall annually, according to statistics and parameters calculated by the moment method initially estimated that the average annual runoff reservoir 113.2 million m3, Cv=0.50, Cs=2.5Cv. Reservoir canyon reservoir, reservoir construction program through the optimization of the final decision to select the next canyon reservoir dam-building program, the dam area on the lithology of permian shiqianfeng group P2 sh conglomerate, sandstone, mudstone and sandstone fine sandstone.Area reservoir erosion, erosion fold stone zhongshan gorge area, the geological phenomenon mainly as rock weathering, avalanches and landslides. Poor curtain grouting grouting length and quality of local presence around the dam leakage leads to many problems, and as the water level rises and the overflow point also will increase the tendency to increase the seepage discharge from the reservoir engineering geological conditions herein, topography and other aspects of starting, while the introduction of entropy analysis method of slope stability of bank slopes and seepage problem analysis and calculation, and finally through the comparison of different engineering solutions, gives the corresponding optimization measures, the main contents include the following several aspects:(1) Comparison of different schemes, it is proposed to build the dam seepage single row of high pressure fixed spray cutoff wall, the other on concrete cutoff wall of sand and gravel and loam sink cut between grout curtain will be to solve the leakage problem.(2) The dam crest part of the shell and the core wall gravel excavation all by reducing the crest elevation of the ways to reduce internal wetting line, while the United slope foot line of stabilizing piles and the use of special clay soil solidification grouting techniques processing dam infiltration problems.(3) Spillway tunnel imports and exports carry out alterations, demolition of all the spillway tunnel, redevelopment shore tower structure overhaul chamber, hole posture adopted consolidation grouting and lining steel reinforcement, to solve the problem of insufficient intensity discharge structure.Reservoir renovation project in order to achieve the desired results, it must be a reasonable long-term planning and management systems combine to further strengthen the construction of the relevant laws and regulations, such optimization reinforcement construction institutionalized, it will be solved within the water reservoir area resource supply and demand, effective way to promote the area’s economic development.