Abstract：Research purposes:It is the first attempt in our country to transform the existing civil air defense engineering into subway. Unilateral and bilateral excavation are being used in the reconstruction of the original tunnel. In order to provide theoretical guidance and decision-making basis for the tunnel construction safety，combined with numerical analysis and field monitoring, we study the stress distribution and arch，surface settlement status in the whole progress.
Research conclusions:Based on the structure，construction technology，monitoring，measurement and numerical simulation，we analysis the distribution of stress field and the law of surface settlement in the construction process，and get the following conclusion:(1) The surface and vault settlement caused by unilateral or bilateral excavation is less than the standard , so it is reasonable construction procedure. ( 2 ) We discussed the phenomenon of stress concentration in the process of implementation of two kinds of construction methods，and determined the corresponding location of the maximum stress occurs.(3)It has significant differences on the settlement of tunnel structure which mainly performs in the position of the maximum settlement value occurs. (4)The study found，by contrast，that the construction method has little influence on the change of surface settlement.(5)So the research results can accumulate experience for the city subway construction and provide higher guidance value to the similar projects.
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2014, Vol. 31 
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