Reasearch On Tunnel Across Fault Under Spatially Varying Earthquake Ground Motions And Reinforcement Measure In The High Intensity Earthquake Zone

It is inevitable to be encountered with tunnel constructed across faults in the design of tunnels,area of inflence by faults and how to reduce the faults effectro stabilty and security of tunnel structures are of importance in design and construction of tunnels.With the west of China greatly exploiting, a mass of tunnels for highway, railway,and water and electricity projects have been constructing. It is inescapable to construct tunnels near faults or in high earthquake intensity regions.The seismic response analysis of underground structures is of great economic and social significance. As a special structure of tunnel constructed in high earthquake intensity regions, it is necessary to study on tunnels across faults in seismic response and the corresponding measures of shock absorption. This paper is research on seismic dynamic response of tunnels across faults, and numerical modeling is applied to analyzing seismic dynamic response rules of tunnels across faults. This contents are summarized as following:(1) The spectrum or frequency components with Lebuguolaji tunnel seismic wave are analyzed; due to the baseline drift in the seismic wave, baseline correction has been applied. In additionwave passage effect is use in the numerical analaysis.(2) The effects of many factors on seismic dynamic response of tunnels across faults, such as width of faults,the angle of faults, parameters of surrounding rock, are numerical modeled, and rules of variation in corresponding parameters are analyzed and compared.(3) The effects of shock absorptions are analyzed by way of changing depth of grouting,changing length of grouting,the influences of variations of depth of grouting,length of grouting are summarized.(4) The effects of shock absorptions are analyzed by way of changing length of bolts, and the influences of variations of length of bolts are summarized.(5) The effect of deformation jiont on longitudinal dynamic response of tunnels is analyzed.In the final chapter of this thesis, conclusion and expectation are given.