›› 2013, Vol. 34 ›› Issue (S1): 399-405.

• Geotechnical Engineering • Previous Articles     Next Articles

Deformation effect on existing tunnels overlapped by new tunnel in lower-region

LIU Shu-jia1，ZHANG Meng-xi1，WU Hui-ming2，LI Lin1   

  1. 1. Department of Civil Engineering, Shanghai University, Shanghai 200072, China；2. Shanghai Tunnel Engineering Co., Ltd., Shanghai 200062, China
  • Received:2012-10-24 Online:2013-08-30 Published:2014-06-09

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Abstract: Aiming at the Shanghai metro tunneling line No.4, that is, a tunnel within ultra-near distance crossed through the adjacent operating metro line No.11, the three-dimensional finite element method was applied to analyze the deformation distribution of the existing tunnel. The deformation analysis is based on three elements: different clearance distance, earth pressure of the chamber, injecting quantity of grout. Based on the results of the numerical modeling and theory of orthogonal analysis, the concept of influence coefficient for the overlapping tunnel is inferred. Through the results of orthogonal analysis, it was shown that: in the procession of overlapping, the distance affects the displacement field of the existing tunnel evidently; the influence on the earth pressure is secondary, injecting quantity effects slightly. These results could provide valuable preference to the technology of micro-perturbation control in the construction of overlapping tunnels.

Key words: shield tunnel, overlapping, orthogonal analysis, influence coefficient

CLC Number: 

  • U 452
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