Abstract：Based upon the observed data of uplift pressure and prior information of pouring water test in Baishan hydraulic power station，the permeability coefficients of rock and concrete are identified by making use of neural networks. According to the inversion results of permeability coefficients，the changes of the uplift pressure are researched by three-dimensional FEM under the four different loading cases after the plunge pool excavation. The computation results testify that the construction of plunge pool will not increase the uplift pressure while the drainage system of plunge pool is effective. The construction of plunge pool will increase the uplift pressure while the drainage system of plunge pool is invalid. The technological measures of reducing uplift pressure have been taken for the dam foundation with high uplift pressure based on the calculation result.
