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Volume 54 Issue 3
Jun.  2019
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Article Contents
Journal of Southwest Jiaotong University  > 2019  >  54(3): 461-467, 586.
WANG Mingnian, HUANG Haibin, TANG Yuan, WANG Chuang, LIU Dagang. Influence of Shield Construction on Pressure Fluctuation of Segment Grout[J]. Journal of Southwest Jiaotong University, 2019, 54(3): 461-467, 586. doi: 10.3969/j.issn.0258-2724.20170199
Citation: WANG Mingnian, HUANG Haibin, TANG Yuan, WANG Chuang, LIU Dagang. Influence of Shield Construction on Pressure Fluctuation of Segment Grout[J]. Journal of Southwest Jiaotong University, 2019, 54(3): 461-467, 586. doi: 10.3969/j.issn.0258-2724.20170199
shu

Influence of Shield Construction on Pressure Fluctuation of Segment Grout

doi: 10.3969/j.issn.0258-2724.20170199
  • Received Date: 27 Mar 2017
  • Rev Recd Date: 11 Dec 2017
    • Available Online: 02 Apr 2019
  • Publish Date: 01 Jun 2019
    Abstract
  • In order to investigate the cause of slurry pressure instability segment tracking changes in the process of synchronous grouting segment, the variation law of external load of segments and the grouting lag time during shield tunneling were obtained, by means of the field test and construction parameter statistics of the Maliuzhou tunnel project in Zhuhai. The relationship between the volumetric strain of the shield tail and the grouting pressure was deduced by treating the clearance of the shield tail as a closed vessel filled with high pressure liquid and the shield driving as changing the boundary conditions of the vessel.The applicability of the research results was verified by the monitoring results of the Qianjiang tunnel and the Sohpia tunnel. The results show that the fluctuation of slurry injection pressure, the diffusion of serous fluid when the lining is out of the shield, the lag effect in the construction process of synchronous grouting compared with tunnel excavation are the main factors that cause the change of slurry pressure instability behind segment. The average lag time of the grouting phase compared to the shield propelling in the Maliuzhou tunnel is 86 s, when the volumetric variable is 1 × 10–4, the change of slurry pressure reaches to 0.218 MPa, which verify the phenomenon that the lag effect makes the soil pressure behind segment reduced sharply when the shield is pushed from stationary to tunneling.

     

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