Back-filled Grouts Diffusion Model of Shield Tunnel Considering Its Viscosity Degeneration

YE Fei, GOU Chang-fei, CHEN Zhi, LIU Yan-peng, ZHANG Jin-long

China Journal of Highway and Transport ›› 2013, Vol. 26 ›› Issue (1) : 127-134.

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China Journal of Highway and Transport ›› 2013, Vol. 26 ›› Issue (1) : 127-134.

Back-filled Grouts Diffusion Model of Shield Tunnel Considering Its Viscosity Degeneration

  • YE Fei, GOU Chang-fei, CHEN Zhi, LIU Yan-peng, ZHANG Jin-long
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Abstract

Assuming that the back-filled grouts are viscosity degeneration fluids, and the grouts diffuse with cylinder surface in view of the influence of tail gap, the grouts diffusion area and the pressure on shield tunnel segments were derived with Darcy law. As a result, the formulae to calculate the radius and the pressure were acquired. Through specific examples, the diffusion radii and the pressures on segments when considering and neglecting the grouts viscosity degeneration were compared, as well as in the condition of different gel time. The results show that the change rules of the diffusion radii and the pressures on segments are not the same when considering or neglecting the grouts viscosity, and viscosity degeneration has a significant influence on the diffusion radii and the pressures on segments, which can be controlled by grout formulae, however, the pressures on unit areas of segments are almost not affected by grouts viscosity degeneration.

Key words

tunnel engineering / shield tunnel / theoretical derivation / back-filled grouting / viscosity degeneration / grout diffusion

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YE Fei, GOU Chang-fei, CHEN Zhi, LIU Yan-peng, ZHANG Jin-long. Back-filled Grouts Diffusion Model of Shield Tunnel Considering Its Viscosity Degeneration[J]. China Journal of Highway and Transport, 2013, 26(1): 127-134

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