| In recent years,the urban rail transition construction is developing rapidly, while there are appearing a lot of problems in the process.There will be directly involved in a series of outstanding problems in the urban shallow buried tunnel such as the urban environment and its layout,soft rock and the impaction of underground pipes and so on.The analysis and evaluation of rock stability in urban shallow buried tunnels is a basic work in the designing and constructing as well as operating which must be safe and effective in the tunnel。Based on the tunnel project between Hua Xinjie and Guan Yinqiao ,this article researched the effect of different construction methods on the stability of urban shallow buried tunnel.Using the numerical simulation method, this article calculated and analyzed the actual excavation sequencens, the following contents are included:①Learning form the home and abroad relating designing and construction experiences , and referring to some results which are researched already,this article analyzed the construction method in shallow buried soft rock tunnel.②The stability of weak and swallow buried tunnel ,which is constructed with CD method ,is analyzed using finite element software. And the stability of tunnel is analyzed while the temporary supports are removed while constructing.③The stability of weak and swallow buried tunnel ,which is constructed with CRD method ,is analyzed using finite element software. And the stability of tunnel is analyzed while the temporary supports are removed while constructing.④The advantages and disadvantages of two different methods in swallow buried tunnel constructions are compared and analyzed .Lastly, a recommendation on construction method in urban swallow buried tunnel is proposed to ensure the stability in construction process.The results of this study has a good guiding value in the construction of tunnel ,and it will provide some practical values for the similar projects in futrue. |
PDF Full Text Request