Journal of Northeastern University Natural Science ›› 2015, Vol. 36 ›› Issue (2): 274-279.DOI: 10.12068/j.issn.1005-3026.2015.02.026

• Resources & Civil Engineering • Previous Articles     Next Articles

Underpinning Technique Based on Cover-Cut Method for Underground Passage Project at Shenyang Railway Station

CHEN Chen1, ZHAO Wen1, LI Shen-gang1, PANG Yu-bin2   

  1. 1. School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China; 2. China Northeast Architectural Design & Research Institute Co., Ltd., Shenyang 110003, China.
  • Received:2013-10-09 Revised:2013-10-09 Online:2015-02-15 Published:2014-11-07
  • Contact: CHEN Chen
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Abstract: The excavation process of the underground passage under the east station house at Shenyang station was simulated by FEM. The land subsidence, deformation of retaining piles, inner force of stand columns, and the deformation of underlying tunnel were analyzed. The results show that underpinned plates can limit the horizontal displacement of retaining piles and the upheaval of the pit bottom effectively, thus controlling the land subsidence. The upheaval of the soil at the pit bottom caused by the excavation process leads to the increase of the axial force of stand column, which may affect the stability of the support structure system. Moreover, the excavation process has an obvious effect on horizontal and vertical displacement of underlying tunnel, where one kind of convergent deformation happens in the tunnel in the form of ‘the horizontal compression and the vertical stretch’. The impact of the cross constuction of foundation pit on the ambient environment and structures cannot be ignored.

Key words: pit excavation, underpinning technique, cover-cut method, land subsidence, underground passage, subway

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