Through taking an interval tunnel underpass masonry civil air defense project in Zhengzhou City as an example,3D finite element method is used to model the actual project,the deformation of gas civil air defense project in underpass reinforcement area of double shield tunnel is analyzed,and the surface settlement and horizontal displacement caused by shield tunnel construction are investigated.The results show that the cement mortar filling significantly reduces the displacement of the existing masonry civil air defense structure,and the structural displacement of the unfilled area is significantly larger than that of the filled area,but all of them are within the allowable range.Successive excavation of double tunnels results in different surface settlement curves.The analysis of stratum and structure deformation by finite element model can provide reference for similar shield crossing construction in the future.
关键词
有限元/盾构施工/既有结构/斜穿/地表沉降
Key words
Finite element/Shield construction/Existing structure/Inclined under crossing/Surface subsidence
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