Jinping Hydropower Station Deep And Long In Diversion Tunnel Simulation And Prediction

Based on the typical rock-burst phenomenon in the constructing subsidiary tunnel of Jinping II hydroelectric power station in YaLong River, considering the early research results, with the geology investigates for basic analysis method, study the rock burst of the deep tunnels and explode the mechanism proceeding studies, with resembles material of the physics model experiments in lab, exploding the phenomenal formation the process to the rock burst to proceed the emulation with the mechanism, according to adopting the geology synthesize prediction, judgments of the ratio for stress and intensity prediction, the misty mathematics-gray system synthesizes prediction, the BP nerve network prediction etc. various methods to explode the whole aqueduct tunnel on rock burst. We have obtained the following research results mainly:(1)Studying the measure a ground of reconnaissance data with the engineering area result of the ground stress an anti analysis to leading the aqueduct tunnel typical model cross section two times stress a proceeding number imitate the analysis, getting round the rock two times stress value is higher, the general tunnel's slices murally direction stress is 90 the 110 MPa , the biggest slice direction stress is 125 MPa, the influence of two times stress of excavate the tunnel is 18m around the tunnel wall.(2) Under the thorough studying the A and B subsidiary tunnel, we find the basic characteristic of distribution of the rock outburst in the working area. The main destroyed formation mechanism explodes is tensional fracture-exfoliation and bending-bread-off and periclinal outbreak. And the lower classed destroyed mechanism presented by rock burst is tensional fracture-exfoliation and bending-bread-off (â… , â…¡), the higher classed destroyed mechanism presented by rock burst is periclinal outbreak (â…¢).(3) Through the physical simulation that rock explode the spot rock imitate to experiment, we conclude that the different part in the hole of tunnel in loading process have present different stress state. When the second stress σ₂ is invariability, the first stress σ₁ is loaded to 25.8MPa, shear suppress stress is increase, radial stress is increase at the same time, the rock's stability is worse. It is easy to destruct with the omen of rock burst.(4) With the rock of the alike material explode the physics imitate to experiment...