| The risk and critic caused by city tunnel construction has arouse the concern of engineering and academic circles from home and abroad. The research on the protection program and criteria to the environmental risk and surrounding buildings has become the ugent research problem. Based on the exisitng research results, by means of theoretical analysis, field investigation and numerical simulation, this thesis establishes a risk index assessment model according to the characterictics of near bridge security risk, and then verifies the practicality and effectiveness of this model and method through project examples. The main content of this thesis is as follows:1) this part gives a general review on the theoretical research on the tunnel project from home and abroad as well as the current situation research on the influence of tunnel construction on adjacent bridge and then summarizes some problems and shortcomings existing in the tunnel risk research and application.2) Based on the engineering risk assessment processes and combines the major risk characteristics during tunnel construction and corresponding damage form and criteria of bridge, this part gives tunnel construction's risk assessment processess to adjacent bridge and introduces the usual way of risk analysis.3) In this part, the author introduces the common risk index assess model, gives a consideration of bridge construction to adjacent bridge's risk assessment processes, from the angle of disaster risk, establishes city tunnel construction to adjacent bridges' risk index assessment model.4) This part, puting the existing overpass of Xi'an subway as the engineering basis, uses the methods of comprehensive index and PC respectively to assess the general and major risk incidents and at the same time, analyzes the reinforcement measures and their effects on the project, in this way gets a credible assessment result and verifies the reliability and practicality of this risk assessment modle. |
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