The Construction Technology Research Of Tunnel Underpassing Xinxiang Railway Station

In recent years, cities to speed up the construction and improvement of the ground transportation system, perfect the ground transportation systems to a certain extent, ease the traffic situation, but still can’t satisfy the needs of the citizens, people begin to turn to development of underground transportation system, all kinds of underground transportation facilities arises at the historic moment. The underground tunnel construction will inevitably under wear both with buildings or line, line.However, neither the under wear in the form of tunnel, the excavation disturbance formation, is bound to cause the subsidence of ground, the settlement of adjacent buildings causes tilt, as well as the distortion phenomenon. If you do not take appropriate construction methods and the protection of reinforcement measures can happen too much deformation, light burst, or collapsed, to the national cause huge economic losses and adverse social impact. Reason analysis in tunnel under construction to the influence of the ground buildings and forecast its safety assessment has become the urgent subject need to research.Based on security engineering underpassing xinxiang plain road railway station tunnel as the background, through numerical simulation, find out the reasonable construction, and analysing the effect of the tunnel construction to the railway station.The dissertation mainly includes the following several parts:(1)Comprehensive analysis of the advantages and disadvantages of various advanced support measures and construction methods and their applicable conditions,combined with the engineering geological and environmental factors, we can get the conclusion that this project tunnel should adopt pipe roof grouting advance supporting measures, construction methods should be used in the next crossover(CRD method) or box culvert jacking method.(2)Through the FLAC3 D finite difference software simulation of tunnel construction process, the CRD method advanced support scheme optimization,considering four kinds of forepoling schemes, respectively isφ108 big pipe shed plusφ42, φ600 scheme of small conduit pipe curtain horizontal reinforcement scheme,φ600 pipe curtain around the reinforcement scheme, φ300 pipe curtain around the reinforcement scheme. Through the numerical simulation analysis, obtains the CRD optimal forepoling schemes for 300 pipe curtain around the reinforcement scheme.Based on it, research on influence of tunnel construction under the scheme to the station.(3)The pipe roof box jacking around the scheme and method combination,through the numerical simulation, study the construction of box culvert peripheral displacement caused by the above and to the station influences, and pipe curtain forepoling measures for comparative analysis under CRD construction schemes.