Research on Optimization of Pipe Roof Pre-Support Parameters in Closely Spaced Large Section Tunnels

DOI

10.2991/978-94-6463-514-0_31How to use a DOI?

Keywords

Closely spaced large section tunnels; Surrounding rock stability; Numerical simulation; Pipe roof pre-support; Parameters optimization

Abstract

In order to research the influence of the pre-support parameters of the pipe roof on the tunnel support effect of the large section and small spacing tunnels, the numerical analysis software MIDAS/GTS NX was used to model and analyze a new double-track tunnel. By changing the parameters such as pipe diameter, pipe spacing, arrangement angle and grouting thickness, the numerical simulation of various working conditions was carried out, and the influence of pipe roof parameters on the stability control effect of surrounding rock of large section and small spacing tunnels was analyzed. The results show that increasing the diameter and reducing the spacing of the pipe roof can reduce the settlement of the crown. The optimal diameter of the pipe roof is 108 mm and the pipe spacing is 0.4 m. Increasing the arrangement angle of the pipe roof has a good control effect on the deformation and failure of the middle rock pillar. Without other supporting measures, 180° can be selected as the optimal arrangement angle of the pipe roof. The optimized grouting thickness of the pipe roof is 1.0 m. When it is greater than this value, the control effect of increasing the grouting thickness on the stability of the surrounding rock is not obvious.

Copyright

© 2024 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Jiong Zhang
AU  - Guoyuan Xu
PY  - 2024
DA  - 2024/09/28
TI  - Research on Optimization of Pipe Roof Pre-Support Parameters in Closely Spaced Large Section Tunnels
BT  - Proceedings of the 2024 7th International Symposium on Traffic Transportation and Civil Architecture (ISTTCA 2024)
PB  - Atlantis Press
SP  - 294
EP  - 303
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-514-0_31
DO  - 10.2991/978-94-6463-514-0_31
ID  - Zhang2024
ER  -