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Tunnel Construction ›› 2015, Vol. 35 ›› Issue (11): 1121-1126.DOI: 10.3973/j.issn.1672-741X.2015.11.002

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Impact of Excavation Procedures of Shallow Large Crosssection Tunnel with Piperoofing and Frozen Soil on Tunnel Behavior and Ground Movement

ZHANG Dongmei1,2, ZHANG Bokai2, LIU Zhigang3   

  1. (1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University,  Shanghai 200092, China; 2. College of Civil Engineering, Department of Geotechnical Engineering, Tongji  University, Shanghai 200092, China; 3. The Management Center of Zhuhai Link Road of Hong KongZhuhaiMacao Bridge, Zhuhai 519030, Guangdong, China)
  • Received:2015-08-06 Revised:2015-09-09 Online:2015-11-20 Published:2015-11-25

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Abstract:

The tunnel excavation using mining method affects the tunnel behavior and ground movement significantly. Gongbei connection line of Hong KongZhuhaiMacao Bridge is a shallow large crosssection tunnel, with poor soil quality and high political sensitivity. In the paper, four potential excavation procedures are studied for the tunnel using FEM. The numerical results indicate that the excavation procedure has significant effect on the lining force, tunnel convergence and ground movement. The ground improvement using pipe roofing and frozen soil supporting is also investigated. The effect of ground improvement is then checked in terms of the tunnel lining force and tunnel convergence. It is found that the ground improvement can reduce the lining force and ground movement significantly.

Key words: FEM analysis, excavation procedure of shallow large crosssection tunnel, piperoofing and frozen soil, tunnel behavior, ground displacement, soil plastic zone

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