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Abstract

The advance grouting method has a wide range of applications in tunnel construction, and its effect is influenced by factors such as hydrogeological conditions and construction techniques. Improper grouting can cause local uplifts in the strata, which can have adverse effects on the safe operation of the tunnels. Based on a construction case of a subway tunnel in Shenzhen, this paper adopted the discrete element method to explore the disturbance mechanism of advance grouting of the entire tunnel section on the geological strata. Due to the fact that advance grouting of the entire tunnel section belongs to a fluidsolid coupling problem, this paper employed a pipeline-domain model to simulate the grouting process. Specifically, pipelines were utilized to connect various fluid domains, while the fluid domains were for storing information such as the fluid pressure and flow rate. The calculation results show that during the grouting process, the slurry will produce infiltration and fracturing effects in the strata. Under the combined action of the two, the stratum disturbance can be roughly divided into four stages, including the infiltration filling, rapid uplift, uniform uplift, and slow uplift. The fracturing effect can cause a rapid stratum uplift, which occurs when the grouting pressure is greater than the minimum principal stress of the strata. Therefore, the key to preventing the stratum uplift is to make the grouting pressure less than the minimum principal stress of the strata, which is consistent with the phenomenon observed during the construction.

Publication Date

1-18-2024

DOI

10.14048/j.issn.1671-2579.2023.06.043

First Page

273

Last Page

277

Submission Date

March 2025

Reference

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