Journal of Hebei University (Natural Science Edition) ›› 2016, Vol. 36 ›› Issue (5): 455-461.DOI: 10.3969/j.issn.1000-1565.2016.05.002

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Analysis of surface subsidence rule for small clear distance tunnel’s shield construction in the soft soil layer

YU Li1,NIU Xiaoyan1,HE Jibin2,GUO Wei2   

  1. 1.College of Architecture and Engineering, Hebei University, Baoding 071002, China; 2.Center for Hydrogeology and Environmental Geology, China Geological Survey, Baoding 071051, China
  • Received:2015-12-27 Online:2016-09-25 Published:2016-09-25

Abstract: In the soft soil layer,the analysis of the ground surface settlement in tunnel’s shield construction,it was of great significance to ensure the safe construction and control of ground settlement.Taking the soft soil layer of Suzhou Metro Line 4 as an example,according to the field condition and the monitoring section design,compared with the single hole and double hole construction of surface subsidence’s change law,the following conclusions were drawn: the influence of the tunnel construction of the second hole on the first hole was a process of extrusion,shearing and stretching,and surface subsidence were also increased or reduced;along with the second tunnel’s construction,the first hole’s vertical and lateral settlement of the ground surface increased first and then decreased;after the first hole construction,it formed a disturbance ring,so that the surface settlement of the second tunnel was always greater than the amount of the first hole settlement.

Key words: soft soil layer, small clear distance tunnel, shield construction, the surface subsidence

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