Study On Leakage Analysis Of Impervious Curtain In Reservoir

Leakage of reservoir is exist widely in the water conservancy engineering problems, especially some built in the water conservancy project in the 1980 s,anti-Seepage processing is the main content of water conservancy engineering maintenance and reinforcement of, this paper to reservoir anti-Seepage curtain of the dam repair construction of data based, according to groundwater Seepage analysis principle, Seepage analysis model is established, to calculate the curtain under the different conditions of leakage.Nanmenxia Reservior is a medium-sized reservoirs in Huzhu County, Qinghai Province, in Seepage prevention construction design along the Seepage line were pilot hole Geological Drilling, Water Pressure Test, and the Hole Electromagnetic Wave CT,Hole Temperature Field Test, Drilling Panoramic Imaging, direct and indirect attack from the curtain of rich geological information, for this article of anti-Seepage curtain Seepage analysis and research to provide the basis for detailed materials. Through Drilling Panoramic Imaging data statistics of the curtain line of the fractured rock mass number, width, shape, and then calculate the Permeability Tensor of fractured rock mass, using pressure water test Permeability coefficient correction the fissure survey method to obtain the Permeability Tensor, curtain line of rock permeability tensor principal values and direction. According to the finite element in groundwater Seepage theory, using finite element groundwater flow simulation software Geo-Studio Seep/W, selected the three Permeability Tensors direction of the main profile, Seepage analysis model is established, the calculation under the condition of the reservoir around abutment and the dam foundation leakage, according to the allowable Seepage flow, curtain depth estimated and actual design coincide. The main research contents of this paper are as follows:(1)Analysis of the mathematical model and boundary conditions of groundwater Seepage principle, selection of finite element Seepage of dam foundation Seepage model of in Geo-Studio Seep/W software simulation.(2)A detailed analysis of the Nanmenxia Reservoir in Seepage treatment design of exploration data, using Pressure Water Test, Drilling Panoramic Images,Electromagnetic Wave CT, Temperature Field, such as data analysis of reservoir leakage area, the fissures of borehole measurements obtained from the permeability tensor of the rock Seepage, and the pressure water test permeability coefficient ofcorrection, correction coefficient about fluctuations in the surrounding of 1, the permeability tensor principal direction and fracture development in the same direction,with the traditional measurement method compared to better reflect the in-situ geological environment of fractured rock mass permeability and main Seepage.(3)Simulation of dam foundation curtain depth under the condition of groundwater Seepage flow changes, changes in contrast before and after the grouting Seepage flow, simulation results and the actual observation results are basically consistent, the built model can be used for reservoir Seepage of groundwater in the study. The Seepage model of the left and right dam abutment is established to simulate the Seepage condition of the groundwater under different working conditions,and the optimal depth of the curtain of the left and right dam abutment is determined.