Large Deformation Control of Tunnel Surrounding Rock Based on Advance Stress Release and Grouting Reinforcement

WANG Junjie; ZHANG Shuai

doi:10.3969/j.issn.0258-2724.20230706

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WANG Junjie, ZHANG Shuai. Large Deformation Control of Tunnel Surrounding Rock Based on Advance Stress Release and Grouting Reinforcement[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230706

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WANG Junjie, ZHANG Shuai. Large Deformation Control of Tunnel Surrounding Rock Based on Advance Stress Release and Grouting Reinforcement[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230706

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Large Deformation Control of Tunnel Surrounding Rock Based on Advance Stress Release and Grouting Reinforcement

doi: 10.3969/j.issn.0258-2724.20230706

WANG Junjie^1
,,
ZHANG Shuai²

1.
School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China
2.
School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China

Received Date: 25 Dec 2023
Rev Recd Date: 04 Apr 2024

Available Online: 10 Feb 2025

Abstract

Abstract

To address the limitations of using an advance guide tunnel for controlling large deformations of surrounding rock in soft rock tunnels, a deformation control method of “advance stress release + circumferential (lagging) grouting + lengthened anchor rod” was proposed after a thorough analysis of the large deformation characteristics of soft rocks and associated problems. Based on a unified model for the degradation of post-peak stiffness and strength of soft rocks and a unified strength criterion, the elastic-plastic solutions for the advance guide tunnel and main tunnel surrounding rock were obtained. Then, the constitutive model for the degradation of post-peak stiffness and strength of soft rocks was developed in FLAC3D finite difference software, and the deformation and stress distribution of the advance guide tunnel and main tunnel surrounding rock were obtained. Finally, the influencing factors such as softening modulus, grouting parameters, radius of advance guide tunnel, and distance between two tunnel faces were analyzed. The research results indicate that the advance guide tunnel can effectively release the surrounding rock deformations induced by compression, and the loosening and fracturing of the rock mass are the main reasons for excessive deformations and stability decrease of the release layer and main tunnel surrounding rock. Circumferential (lagging) grouting can effectively control the loosening deformations of the surrounding rock during excavation, improve the stress distribution of the surrounding rock, and enhance the load-bearing capacity of the surrounding rock. Larger values of the softening moduli M_c, M_φ, and M_E indicate strong surrounding rock deformations of the advance guide tunnel. Larger values of grouting parameters c_g, φ_g, and E_g indicate deformations of the main tunnel surrounding rock. Increasing the excavation radius r₀ of the advance guide tunnel and increasing the distance between the two tunnel faces (advance guide tunnel and main tunnel) can make the initial ground stress release more sufficient.
- high ground stress,
- weak surrounding rock,
- advance guide tunnel,
- grouting reinforcement,
- large deformation of surrounding rock,
- elastic-plastic analysis

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References

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