Study on Biased Multi Arch Tunnel Biasing Angle Effect on Mechanical Behavior of Surrounding Rock Bias

DOI

10.2991/iceep-18.2018.124How to use a DOI?

Keywords

Multi arch tunnel, Terrain bias, Bias angle, Bias characteristic

Abstract

The exits and entrances of the multi arch tunnel are often located in unfavorable geological sections, such as shallow buried, bias, high weathering degree, rock breaking and so on. In addition, the existence of the side slope makes the force more complicated after the tunnel excavation. When exits and entrances of tunnels are excavated, there are often large deformation of surrounding rock, initial deformation and two lining cracks. Serious accidents may lead to collapse and instability. Based on the geological conditions and the mechanical characteristics of the surrounding rock, the influence of the bias angle of the biased multi arch tunnel on the mechanical properties of the surrounding rock after excavation is studied by the theoretical analysis and numerical simulation. It is said that with the increase of the bias angle; the influence of the deep buried side of the bias tunnel is more obvious than that of the shallow buried side. Numerical simulation of excavation of a multi arch tunnel under different bias angles is carried out. According to the analysis of the critical point displacement, the influence of the tunnel under the bias pressure intensified as the slope go steeper. And when the thickness of the earth beside is over 15 meters, the influence of it would get rids of the change of different bias angle. These results can provide some reference and guidance for similar arch tunnel design, construction and research.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Cheng-liang Zhang
AU  - Jiang-xu Shi
AU  - Wen-qian Lv
AU  - Zi-long Wang
PY  - 2018/09
DA  - 2018/09
TI  - Study on Biased Multi Arch Tunnel Biasing Angle Effect on Mechanical Behavior of Surrounding Rock Bias
BT  - Proceedings of the 2018 7th International Conference on Energy and Environmental Protection (ICEEP 2018)
PB  - Atlantis Press
SP  - 714
EP  - 719
SN  - 2352-5401
UR  - https://doi.org/10.2991/iceep-18.2018.124
DO  - 10.2991/iceep-18.2018.124
ID  - Zhang2018/09
ER  -