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Volume 41 Issue 5
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LIU Xue-yan, WANG Fu-ming, YUAN Da-jun, FANG Hong-yuan, ZHANG Shi-long. Range of support pressures for slurry shield and analysis of its influence factors[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(5): 908-917. DOI: 10.11779/CJGE201905014
Citation: LIU Xue-yan, WANG Fu-ming, YUAN Da-jun, FANG Hong-yuan, ZHANG Shi-long. Range of support pressures for slurry shield and analysis of its influence factors[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(5): 908-917. DOI: 10.11779/CJGE201905014
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Range of support pressures for slurry shield and analysis of its influence factors

  • 1. School of Water Conservancy and Environment, Zhengzhou University, Zhengzhou 450002, China;
    2. School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China;
    3. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;
    4. Tianhe Mechanical Equipment Manufacturing Co., Ltd., Changshu 215557, China

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  • Received Date: June 13, 2018
  • Published Date: May 24, 2019
    Graphical Abstract
    • Abstract
  • The earth pressure balanced shield supplies a passive support for the tunnel face. However, the slurry shield offers an active support for the tunnel face with slurry (liquid medium). The key work for slurry support is to choose a suitable slurry and a support pressure to form a slurry cake and maintain its integrity. Based on the theory of soil fracturing and the wedge-prism model, the upper and lower bounds of slurry support pressures are supplied. Slurry support pressures are analyzed with consideration of hydrostatic pressures, soil properties, tunnel diameters and earth covers. It is suggested that the lower bound of the support pressure is mainly affected by hydrostatic pressure and soil friction, especially by the hydrostatic pressure. The slurry support pressure can be usually set as 20 kPa more than the hydrostatic pressure; the upper bound of support pressure is soil fracturing (seepage failure) pressure, mainly affected by hydrostatic pressure and earth cover. The soil fracturing (seepage failure) pressure can be increased by increasing the thickness of earth cover. And then the ranges of slurry support pressure can be also enlarged. However, the ranges of slurry support pressure can only be moved but not enlarged by increasing the hydrostatic pressure. The range length of slurry support pressure is also affected by the soil friction rather than other factors mentioned above. Considering the setting of slurry pressure in shield cutter replacement condition, the ratio of earth cover to tunnel diameter should be larger than 0.8~1.0
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    • References (23)
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