A Case Study on the Construction Optimization Decision Scheme of Urban Subway Tunnel Based on the TOPSIS Method
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pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-1290-9
Tunnel Engineering
A Case Study on the Construction Optimization Decision Scheme of Urban Subway Tunnel Based on the TOPSIS Method Bo Wu
a,b
, Ming Lu
a
, Wei Huang
a
, Yangbing Lan
a
, Yufang Wu
a
, and Zonghui Huang
a
College of Civil Engineering, Guangxi University, Nanning 530004, China College of Civil Engineering, Guangzhou City Construction College, Guangzhou 510925, China
a
b
ARTICLE HISTORY
ABSTRACT
Received 19 July 2019 Revised 1st 18 November 2019 Revised 2nd 26 April 2020 Accepted 10 June 2020 Published Online 28 August 2020
Because of the harsh environment around city subways and the typically poor geological conditions, it is often difficult to ensure the stability of a tunnel, which makes it prone to collapses and other accidents. The influence of multiple factors on tunnel stability was analyzed under the same geological conditions and environmental factors by using a threedimensional numerical simulation. Taking into account the objective environment and manual operation and other factors, construction sequence, support closure time, and reinforcement area and parameters were chosen as the main factors affecting the tunnel stability. Finally, based on ground deformation, tunnel convergence deformation, and surrounding soil stress as evaluation indicators, a fuzzy analytic hierarchy process (FAHP)-gray correlation degreetechnique for order performance by similarity to ideal solution (TOPSIS) model was established. It was found that the higher the relative closeness of the construction parameter combination, the greater the tunnel stability. The best combination of construction parameters was applied to the Tiantongyuan Station project of Beijing Metro Line 17. All geological conditions being equal, reasonable selection of construction parameters can ensure optimal tunnel construction stability, reduce construction risks, and support sustainable tunnel development. In addition, the FAHP-gray correlation degree-TOPSIS method achieved multiindex evaluation of tunnel stability, which provides practical guidance for the construction of similar projects.
KEYWORDS Tunnel stability FAHP Gray correlation degree TOPSIS Sustainable development
1. Introduction With the rapid development of Chinese high-speed railways and urban subways in recent years, the number of tunnel construction projects and tunnel mileage in China now ranks first in the world, and has contributed to the sustainable development of China’s transportation systems. Tunnels account for an important part of the high-speed railway and subway infrastructure, and tunnel stability is an important factor that affects the sustainability of these networks (Satıcı and Ünver, 2015; Zhao et al., 2017; Yan, 2018). In the worst cases of tunnel instability, casualties, collapse, and severe economic losses may occur, which adversely affects urban development. Tunnel instability, water and sand gushing, longitudinal instability of the tunnel face, and
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