Microscopic Model Analysis of Shield Tunnel Backfill Grouting Based on Displacement Effect

YE Fei; QIN Nan; LIANG Xing; HAN Xingbo; HAN Xin

doi:10.3969/j.issn.0258-2724.20200344

Journal of Southwest Jiaotong University > 2022 > 57(2): 339-345.

YE Fei, QIN Nan, LIANG Xing, HAN Xingbo, HAN Xin. Microscopic Model Analysis of Shield Tunnel Backfill Grouting Based on Displacement Effect[J]. Journal of Southwest Jiaotong University, 2022, 57(2): 339-345. doi: 10.3969/j.issn.0258-2724.20200344

Citation:

YE Fei, QIN Nan, LIANG Xing, HAN Xingbo, HAN Xin. Microscopic Model Analysis of Shield Tunnel Backfill Grouting Based on Displacement Effect[J]. Journal of Southwest Jiaotong University, 2022, 57(2): 339-345. doi: 10.3969/j.issn.0258-2724.20200344

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Microscopic Model Analysis of Shield Tunnel Backfill Grouting Based on Displacement Effect

doi: 10.3969/j.issn.0258-2724.20200344

School of Highway, Chang’an University, Xi’an 710064, China

Received Date: 02 Jun 2020
Accepted Date: 02 Dec 2021
Rev Recd Date: 04 Sep 2020
Publish Date: 20 Oct 2020

Abstract

Abstract

When a shield tunnel under construction is below the water level, the shield backfill grouting slurry will drive the groundwater. In order to analyze this driving process, the seepage path of slurry in the soil is generalized to a capillary by capillary group penetration theory, the grout diffusion radius of hemispherical and cylindrical models are deduced considering the diffusion by Newtonian fluid slurry-driven water (Newtonian fluid), and the effects of grouting pressure, water-cement ratio, and formation permeability coefficient are discussed. Results show that the grout diffusion radius is mainly related to the grouting pressure, permeability, grouting time, porosity, and grout and groundwater viscosity. Especially, the grout water-cement ratio has the most significant effect on the grout diffusion radius. When the viscosity of the grout decreases from 0.004 7 to 0.001 9 Pa•s, the spreading radius of grout decreases by 46.7% at 1 h after grouting, indicating that the spreading radius of grout can be increased by adopting a higher water-cement ratio under the same grouting condition. Besides, the grout diffusion radius increases with an increase in the permeability coefficient, and the formation permeability coefficient reflects the difficulty of grout diffusion to a certain extent. Based on the calculation of grout diffusion radius (grout reinforcement range), a calculation method for the lower limit of the grouting pressure is proposed to guide the construction of backfill grouting of shield tunnel.
- shield tunnel,
- backfill grouting,
- penetration grouting,
- displacement effect

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References(16)

References

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