JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2017, Vol. 47 ›› Issue (3): 102-111.doi: 10.6040/j.issn.1672-3961.0.2016.276

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Risk control of extremely close twin shield tunnels nearby passing intensive buildings based on informative construction

LIU Jifeng1, YANG Huanhuan2   

  1. 1. Department of Architecture &
    Civil Engineering, Sanming University, Sanming 365004, Fujian, China;
    2. Beijing Polytechnic College, Beijing 100042, China
  • Received:2016-07-21 Online:2017-06-20 Published:2016-07-21

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Abstract: To reduce the building subsidence induced by nearby passing twin shield tunnels, the FLAC3D was adopted to numerical simulate and analyze the different shield tunnel excavation methods induced the closest building ground settlement. The shield tunneling parameters were optimized for adopted construction method that changed the right line direction with internal cross bracing in left line, and with twin lines reinforcement by tube grouting in surrounding ground. And the related site surveying parameters were presented and analyzed. The results showed that: the previous construction method induced the building differential settlement was 26.5 mm, which was severely beyond the 10 mm limit; piling between buildings and tunnels or internal cross bracing in left line and twin lines tube grouting in surrounding ground were all applicable reinforcement methods to meet 10 mm limit of building differential settlement; it reduced effectively construction induced building settlement by optimizing right line tunneling parameters; the main parameters of later excavated tunnel influence on previous constructed tunnel were tunneling load and grouting pressure, the use of real-time monitoring and information construction was necessary. The extremely close twin shield tunnel successfully nearby passed the buildings, and the results could be consulted for similar projects.

Key words: shield tunnel, nearby passing intensive buildings, informative construction, risk control, extremely close twin lines

CLC Number: 

  • TU94
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