Study on Deformation Characteristics of Surrounding Rock in Small Clearance Tunnel Excavation in Backfill Soil Layer

DOI

10.2991/978-94-6463-404-4_28How to use a DOI?

Keywords

highway tunnel; backfill soil layer; surrounding rock deformation; small clearance tunnel

Abstract

To solving the engineering problems of tunneling in backfill soils, the shallow buried concealed excavation section of the northern line of the Zengjiayan Bridge Tunnel Project in Chongqing has been taken as the relying project and numerical analysis and monitoring have been used to study on deformation characteristics of surrounding rock in small clearance tunnel excavation in backfill soil layer. The result of this study reveals that: firstly, during the excavation the maximum surface settlement will move from the top of the advance tunnel to the top of the intermediate rock pillar. Secondly, the surrounding rock deformation pattern of the backward tunnel could be described as: predeformation-sharp deformation- deformation convergence, and the surrounding rock deformation pattern of the advance tunnel could be described as: predeformation- sharp deformation- first deformation convergence- additional deformation- final deformation convergence. Thirdly, the excavation of the advance tunnel will lead to the predeformation in vault, arch and the side wall of the backward tunnel, and the excavation of the backward tunnel will lead to the additional deformation in the same places of the advance tunnel. The conclusion of this study is consistent with the existing research and can provide reference for similar projects.

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  - Xiaodong Li
AU  - Weilong Xu
AU  - Yanmao Xiang
AU  - Chengrui Yao
PY  - 2024
DA  - 2024/04/29
TI  - Study on Deformation Characteristics of Surrounding Rock in Small Clearance Tunnel Excavation in Backfill Soil Layer
BT  - Proceedings of the 2024 3rd International Conference on Structural Seismic Resistance, Monitoring and Detection (SSRMD 2024)
PB  - Atlantis Press
SP  - 286
EP  - 298
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-404-4_28
DO  - 10.2991/978-94-6463-404-4_28
ID  - Li2024
ER  -