E3S Web Conf.
Volume 283, 20212021 3rd International Conference on Civil, Architecture and Urban Engineering (ICCAUE 2021)
|Number of page(s)||4|
|Section||Research on Civil Engineering and Geotechnical Hydrological Structure|
|Published online||07 July 2021|
Influence of front slope gradient and the angle between tunnel and slope on stability of tunnel portal
1 Yuhuan Agriculture Rural Affairs and Water Conservancy Bureau, Yuhuan 317602, China
2 Zhejiang Guangchuan Engineering Consulting Co, Hangzhou 310020, China
* Corresponding author: firstname.lastname@example.org
Shallow buried and unsymmetrically loaded tunnel is the most common type of mountain tunnel portal. Currently, most of the studies mainly focus on the stability of side slope, while the investigation on the deformation of the front slope after tunnel excavation is relatively less. In this paper, the influence of front slope gradient and the angle between tunnel and slope on stability of tunnel portal was analyzed by FLAC3D. The results show that: When the front slope angle is greater than 40°, the slope deformation caused by tunnel excavation is larger with the increase of slope angle. In order to ensure the safety of construction, we should not only pay attention to the treatment of the front slope before the tunnel excavation, but also pay attention to the monitoring of the front slope deformation during the excavation of the tunnel portal section. And the most suitable entry angle between tunnel axis and the front slope is 0°, which can control the vertical displacement of relatively large deformation. The research conclusions can provide some reference for the excavation and support design of mountain tunnel portal.
© The Authors, published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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