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Appl. Sci. 2017, 7(2), 169; doi:10.3390/app7020169

Field Monitoring of Deformations and Internal Forces of Surrounding Rocks and Lining Structures in the Construction of the Gangkou Double-Arched Tunnel—A Case Study

1
Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
2
China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, Sichuan, China
*
Author to whom correspondence should be addressed.
Academic Editors: Giuseppe Lacidogna and Gangbing Song
Received: 20 November 2016 / Revised: 29 January 2017 / Accepted: 5 February 2017 / Published: 11 February 2017
(This article belongs to the Special Issue Structural Health Monitoring (SHM) of Civil Structures)

Abstract

Double-arched tunnel is a special and complex underground structure which needs to be monitored carefully during construction. Taking the Gangkou tunnel as the engineering background, this paper presents a case study of field monitoring of a representative double-arched tunnel. Typical cross sections were chosen in each class of surrounding rock masses in the tunnel area and different types of sensors were embedded in designed locations, and the deformations and forces of both surrounding rocks and lining structures were monitored systematically. The dynamic evolution as well as the spatial distribution characteristics of the monitoring data including the internal displacements of surrounding rocks and the contact pressures between surrounding rocks and primary linings, the axial forces in rock bolts and the internal forces in both steel arches and secondary linings were analyzed. The monitoring and analysis results show that the deformations and forces of both surrounding rocks and lining structures are directly related to the construction procedures, geological conditions and locations in the double-arched tunnel. According to the results, some reasonable suggestions were provided for the improvement of the tunnel construction. This study will provide useful reference and guidance for the design, construction and monitoring of similar engineering projects in future. View Full-Text
Keywords: double-arched tunnel; new Austrian tunnelling method surrounding rocks; linings; rock bolts; field monitoring double-arched tunnel; new Austrian tunnelling method surrounding rocks; linings; rock bolts; field monitoring
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yan, Q.; Zhang, C.; Lin, G.; Wang, B. Field Monitoring of Deformations and Internal Forces of Surrounding Rocks and Lining Structures in the Construction of the Gangkou Double-Arched Tunnel—A Case Study. Appl. Sci. 2017, 7, 169.

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