Open Access

ARTICLE

Study on the Deformation Mechanism of a Soft Rock Tunnel

Jianhui Yang¹, Kai Shen¹, Shoudong Pan², Shuren Wang^3,*, Zhengsheng Zou³
1 School of Civil Engineering and Architecture, Zhejiang University of Science and Technology, Hangzhou, 310023, China
2 China Railway 16 Bureau Group Co., Ltd., Beijing, 100018, China
3 School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454003, China
* Corresponding Author: Shuren Wang. Email:
(This article belongs to this Special Issue: Advanced Materials, Processing and Testing Technology)

Fluid Dynamics & Materials Processing 2022, 18(2), 243-255. https://doi.org/10.32604/fdmp.2022.016677

Received 17 April 2021; Accepted 30 July 2021; Issue published 16 December 2021

Abstract

The large deformation of soft rock tunnel is one of the key problems to be overcome in the tunnel construction stage. In the present study, the deformation mechanism of a representative tunnel and some related countermeasures are investigated using field tests and engineering geological analysis. Owing to the scarce performances of methods based on other criteria such as small pipe spacing, anchor bolt length and steel frame spacing, a new support scheme is implemented and optimized. Results show that shear failure and bedding sliding are produced under high horizontal stress conditions. The low strength of the surrounding rock results in the uneven convergence of both sides of the tunnel. With the aforementioned new support scheme, however, most of such problems can be mitigated leading to good stability properties and ensuing economic advantages.

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Keywords

Soft rock tunnel; high stress; deformation mechanism; supporting countermeasure

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