| The construction of cross passage after finishing the main tunnel will bring some dangers to the main tunnels. By means of investigation of projects, numerical simulation and analysis of measured data, this dissertation invested cross passages deeply, and the content includes:(1) By investigating project models, this dissertation concluded the construction method of cross passage, compared its applicable geology conditions, field condition, and work period, and concluded each method's strengthens and shortcomings.(2) The dissertation established a risk model to analyze the risk of cross passage under different geology conditions, which will be benefit for selecting construction method.(3) The dissertation established 3-D numerical models to simulate the whole construction process, which analyzed the stress distribution and deformation of across passage and shield tunnels, and found out the disadvantage position of cross passage.(3) With the large quantity of construction monitoring data of the NO.2 line of Shanghai metro and the East Fuxing road cross passage, the dissertation concluded the deformation law of main tunnel and ground, which verified the numerical simulation works in the former, and put forward some useful suggestions for the presented problems.
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