Volume 37 Issue 6
Dec.  2023
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Article Navigation >  GEOTECHNICAL ENGINEERING TECHNIQUE  > 2023  >  37(6): 656-663
Zhu Caihui, Yang Qiqiang, Li Yubo, Song Xiaofeng, Dang Hui. Influencing Factors of External Water Pressure Reduction Coefficient on Lining in Water-rich Loess Tunnel[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2023, 37(6): 656-663. doi: 10.3969/j.issn.1007-2993.2023.06.005
Citation: Zhu Caihui, Yang Qiqiang, Li Yubo, Song Xiaofeng, Dang Hui. Influencing Factors of External Water Pressure Reduction Coefficient on Lining in Water-rich Loess Tunnel[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2023, 37(6): 656-663. doi: 10.3969/j.issn.1007-2993.2023.06.005
shu

Influencing Factors of External Water Pressure Reduction Coefficient on Lining in Water-rich Loess Tunnel

doi: 10.3969/j.issn.1007-2993.2023.06.005
  • 1.

    Shaanxi Engineering Technology Research Center for Urban Geology and Underground Space, Xi’an 710068, Shaanxi, China

  • 2.

    Shaanxi Hydrogeolog Engineering Geology and Environment Geology Survey Center, Xi’an 710068, Shaanxi, China

  • 3.

    Institute of Geotechnical Engineering, Xi'an University of Technology, Xi'an 710048, Shaanxi, China

  • 4.

    China Railway First Survey And Design Institute Group Co., Ltd., Xi'an 710043, Shaanxi, China

  • 5.

    Hanjiang to Weihe River Valley Water Diversion Project Construction Co., Ltd., Shaanxi Province, Xi'an 710011, Shaanxi, China

  • Received Date: 2022-09-01
  • Accepted Date: 2023-05-06
  • Rev Recd Date: 2022-11-07
  • Publish Date: 2023-12-08
    Abstract
  • The reasonable value of the reduction coefficient of external water pressure (RCEWP) in hydraulic tunnel lining is a difficulty in structural design. Taking the hydraulic tunnel of the Hanjiang to Weihe River Valley Water Diversion Project crossing saturated Q2 loess stratum as an example, the physical and mechanical properties of Q2 loess were tested. Based on FLAC3D and coupled fluid-soild analysis method, the sensitivity degree and variation rule of six factors to the RCEWP were studied. The results show that: (1) The sensitivity degree of each factor on the RCEWP from high to low is as follows: The grouting thickness behind the lining (h)> speed of shield advancing (V)> permeability coefficient of loess stratum (kl) > disturbance zone due to excavation (ws)> grouting level (N)> groundwater table (H). The grouting thickness behind the lining has the greatest influence on the RCEWP. When the speed of shield advancing (V)≤9 m/d and the permeability coefficient of loess stratum kl≤0.2 m/d, the RCEWP is greatly affected by them, while the other factors have little influence. (2) Considering the difference of stratum conditions and construction and management level, the RCEWP of lining in saturated Q2 loess ranges from 0.35 to 0.75, with an average value of 0.53.

     

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