Cause Of Formation Of The Dam Zone Red Mud-intercalated And Relaxed-tension Rock Mass And Its Influence On The Engineering In Jiangpinghe Hydroelectric Power Station

Jiangpinghe hydroelectric power station being planned is a earth-rock dam with height of 215m. There is a lot of red mud-intercalated with thickness of several centimeter to exceed ten centimeter in deep of main cavern in left and right bank (main in right bank) when perambulate moment. The rock mass with bad integrality weathering intensively round the red mud-intercalated. The most of right shoulder of dam is involved.It is very important to control stability of rock mass of shoulder of dam and stability of seepage control panel and stability of rock mass seepage and choice of dam style. So,This dissertation take cause of formation and distributing character of red mud-intercalated and relaxed-tension rock mass and its influence on the engineering as main research content. At last,we find the cause of formation of red mud-intercalated by analyzing 4 possible cause of formation : tectogenesis form; natural weathering and relaxtion form; drtion and destroy of slope form; collapse of cavity because of karst affect in the base of investigating istogeological condition of circumscription and dam zone and physiognomy of dam zone. Then, we acquire the style and cause of formation of deep relaxed-tension rock mass base of that: early relaxtion along fault and weak interlayer; nearby relaxed-tension of surrounding rock because of karst; distortion and destroy of top rock mass form deep relaxed-tension because of karst collapse. Then, locating space distributing character of relaxed-tension rock mass base of rock core of drill. At last, computing tectonic stress of dam zone and the relaxed-tension rock mass influence on the engineering(mostly influence on stability of underground cavern) using three-dimensional FEM.