MAIN ENGINEERING GEOLOGICAL PROBLEMS AND TREATMENT MEASURES OF HONGPING PUMPED STORAGE POWER STATION PROJECT AREA

Hongping pumped storage power station's engineering geological problems are complicated. (1)Hydrogeological conditions:Water conveyance system including underground powerhouse underground water acted strongly. Fault development of upper storage reservoir, hydraulic connection of basin and underground powerhouse, leakage problem. (2)Reservoir bank's stability:Stability of upper storage reservoir and its lower slope, et al. In allusion of above, we compared the former different stages of projects and studied the layout of main constructions, carried out test works specifically. Finally, we find out the water permeability of upper and bottom rock and earth mass, underground water and its dynamic regulation, leakage and stability of bank slopereservoir, knowing the engineering geology of lower storage reservoir and hydrogeologicalcondition, carring special work on measurement of geostress, high pressurepump-intest, and physical mechanics of rocks. Regarding to the problems like water burst on fault zone of long caving, the sharp fall of underground water in the south upper storage reservoir, we did some hydrogeological tracer connection tests and leakage calculation. During construction, we should work well not only on geological work but pay more attention to more scientific, more economic and more safety treatment as well as geological forecast. In conclusion of kinds of survey and the geology figures, we adopted effective engineering treatment on upper storage reservoir seepage-proofing, water conveyance systemlining type and underground caverns drainage design, which created a necessary condition for smoothly works for generate electricity in time. It can be used as a reference for similar projects.