3D seepage flow field characteristics research for the right bank of Hadashan Hydroproject

The geological problems of the building of Hadashan Hydro-project are the seepage of the dam base and its stability of infiltration,which will influence the engineering benefit and the safe operation of the dam,and thus proper measures are needed to control the infiltration.A 3D finite element model of seepage flow is set up,which can simulate the geologic conditions of the structure and the geometrical boundary of the dam foundation based on the technology of fix meshing iteration with the cut-off negative pressure method for solving filtration problems.And normal,design and verification conditions are considered to study seepage field characteristics of the earth and by-pass right abutment.Seepage faces,distribution of ground water level,seepage gradient and seepage stability are analyzed.Sensitivity analysis on the percolation parameter of the cutoff wall and rock base has been done in this paper;and their influence on seepage area is deeply analyzed.The results show that the cutoff wall can reduce seepage face of the abutment and dam,and each part of the dam for the largest seepage gradient can satisfy seepage stability.