|
With the rapid development of China 's railway business needs and the importance of the railway tunnel construction have become increasingly prominent , and most parts of China , especially in the central and western mountains, active faults clouds , earthquakes occur frequently . Line choice , tunnels often inevitably need to cross the fracture zones , and how to ensure the security of the across active faults tunnel engineering fault rupture and ground vibration effect of tremendous practical significance . Therefore, the study of cross-fault the tunnel seismic dynamic response and anti- damping measures quite important . In this paper, into a new blue line railway tunnel for the study, the application of dynamic finite element method for cross - fault tunnel fault and seismic dynamic response analysis . This article first briefly across active faults tunnel seismic development overview, summary of the current domestic and international underground structures , seismic and anti faults research methods and computational theory , the basic principle of the calculation method used herein and theoretical overview . Second, the numerical simulation of the response mechanism of fault dislocation occurs across the fault tunnel , comparative analysis of different fault dip fractured width and different rock conditions , the displacement response of the tunnel , structural deformation and changes in LINING law , as well as the implementation of the plastic zone of the tunnel structure . Once again, the cross-fault tunnel seismic dynamic response numerical simulation , comparative analysis in the presence or absence of fracture zones , different fault dip and different fault width under the conditions of the general cross - fault tunnel seismic dynamic response of the law , and summarizes the different working conditions tunnel under acceleration, displacement and stress response law . Finally, based on the numerical simulation calculation results , combined with anti- across of active faults tunnel structure wrong design relatively few studies of the actual situation , focusing on analysis carried out on the the cross faults tunnel surrounding rock reinforcement, set deformation joint few compared kinds of advantages and disadvantages of different anti- wrong , and proposes a new optimized design .
|