Study On The Mechanical Properties And Seismic In Under Highway Shallow Buried Railway Tunnel

Grade separation projects of infrastructure construction in our country, to wear under construction is inevitable. Study on the influence of tunnel under wear construction more and more get the attention of the scholars and experts, but in the construction of shallow railway tunnel under crossing the highway. Research about the surface subsidence control problem of the value in the process of construction, the problem of excavation disturbance of surrounding rock and the change of the surrounding rock stress, the problem of safety of the tunnel structure itself, the influence of vehicle load of shallow buried tunnel, the problem of wear the burial depth of the shallow buried tunnel construction iMPact problems, the dynamic response of shallow buried tunnel under seismic loading, Study of shallow buried tunnel disaster prevention and mitigation are less. In this paper, the research and conclusions are as follows:① Analysis and deduction the basic component of the force of underground engineering, power transmission way and the mechanical behavior, distinguish classification of surrounding rock stress and surrounding rock classification. According to the arching effect of surrounding rock of underground engineering, defined deep tunnel buried depth, analysis the instability and failure of surrounding rock,according to the principle of instability destruction form for lining is derived.② Based on the actual characteristics of tunnel under wear highway, clear the transmission way of highway driving load, the loading scheme according to the static load and finite element analysis, and on the background of Gaoshipan railway tunnel sections of the engineering in Chongqing, using the large general finite element software to establish the finite element entity model, analysis of all kinds of tunnel under wear in the process of construction, the construction mechanics behavior.③ Through analysis the lining of add is one of the key factors that affect the tunnel construction, the earlier add, the disturbance of surrounding rock is smaller. The late of the lining of add, the more powerful by the disturbance of surrounding rock. The excavation section modulus attenuation after 10%～30% when adding lining support, vault settlement of surrounding rock changes smoothly,30%～40% is reasonable economic lining s add time.④ Studied the embedded depth of shallow buried tunnel conditions on the influence of the tunnel, influence of vehicle load on Gaoshipan railway tunnel are analyzed, Gaoshipan railway tunnel road surface subsidence in automotive case is 2 times without a car, the traffic control is particularly important.⑤ By means of time history analysis of finite element analysis model is established, Study the Gaoshipan railway tunnel set period of the earthquake response of shallow buried tunnel hole, Tunnel lining and rock mass displacement CM magnitude, lining and surrounding rock can jointly participate in joint force, vaults of surrounding rock and lining structure stress with the superimposition of the earthquake, quantity are increasing, the second lining structure under earthquake load to bear more load.⑥ From the perspective of energy medium carrier oriented, could be divided into with seismic wave transmission medium in the process of medium carrier unit of time sequence, and through the earthquake disaster can deduce transformation, analysis of the earthquake in the transmission rule of medium carrier. Based on catastrophe theory of chain mechanism, deduction of disastrous earthquake-chain failure mechanism of the structure of the medium carrier, Based on earthquake disaster can medium transmission and evolution of disaster chain, offered to pregnant source chain scission of disaster prevention、conduction process for disaster reduction, chain eventually charged with trinity disaster prevention and mitigation of disasters.