Study on Mechanical Properties of Transformation Construction Method of Loess Tunnel with Extra-Large Section

DOI

10.2991/978-94-6463-398-6_36How to use a DOI?

Keywords

Super large cross-section tunnel; Double sidewall drift; Single sidewall drift; Vault settlement analysis; Horizontal convergence analysis; Initial support stress analysis

Abstract

The Loess Tunnel with extra large section is more and more popular in the construction of expressway in the northwest of our country, therefore, it is necessary to adjust the construction method in time according to the actual geological conditions. In this paper, the settlement deformation, horizontal convergence deformation and initial support stress state of the tunnel are analyzed when the excavation method of double-side-wall pilot pit is converted into the excavation method of single-side-wall pilot shichuan Tunnel. The results show that the stress concentration area is at the intersection of the internal braces in the initial support, and the local concrete cracks may occur in the initial support, but the initial support is a reinforced concrete structure, when local steel bars are cracked, the steel bars will further provide tensile stress; whether it is double or single side wall, the initial support has a high compressive safety reserve; The settlement and horizontal convergence will go through three stages, i.e., short-time sharp increase, micro-adjustment and stabilization, and the final settlement is far less than the designed deformation.

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  - Shilei Zhang
AU  - Tianli Huang
AU  - Wanyun Yin
AU  - Lanmin Xie
PY  - 2024
DA  - 2024/04/24
TI  - Study on Mechanical Properties of Transformation Construction Method of Loess Tunnel with Extra-Large Section
BT  - Proceedings of the 2023 5th International Conference on Hydraulic, Civil and Construction Engineering (HCCE 2023)
PB  - Atlantis Press
SP  - 364
EP  - 376
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-398-6_36
DO  - 10.2991/978-94-6463-398-6_36
ID  - Zhang2024
ER  -