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Mathematical Problems in Engineering
Volume 2012 (2012), Article ID 618979, 13 pages
http://dx.doi.org/10.1155/2012/618979
Research Article

Intelligent Risk Assessment for Dewatering of Metro-Tunnel Deep Excavations

1Institute of Transportation Engineering, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
2Hangzhou Metro Group Co., Ltd., Hangzhou 310020, China
3Research Center for Structural Health Monitoring and Control, School of Civil Engineering, Dalian University of Technology, Dalian 116023, China

Received 14 October 2012; Accepted 4 November 2012

Academic Editor: Sheng-yong Chen

Copyright © 2012 X. W. Ye et al. 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.

Abstract

In recent years, China has been undergoing a metro railway construction boom in order to alleviate the urban traffic congestion problem resulting from the rapid urbanization and population growth in many metropolises. In the construction of metro systems, deep excavations and continuous dewatering for construction of the metro tunnels and stations remain a challenging and high risk task in densely populated urban areas. Intelligent computational methods and techniques have exhibited the exceptional talent in dealing with the complicated problems inherent in the deep excavation and dewatering practice. In this paper, an intelligent risk assessment system for deep excavation dewatering is developed and has been applied in the project of Hangzhou Metro Line 1 which is the first metro line of the urban rapid rail transit system in Hangzhou, China. The specific characteristics and great challenges in deep excavation dewatering of the metro-tunnel airshaft of Hangzhou Metro Line 1 are addressed. A novel design method based on the coupled three-dimensional flow theory for dewatering of the deep excavation is introduced. The modularly designed system for excavation dewatering risk assessment is described, and the field observations in dewatering risk assessment of the airshaft excavation of Hangzhou Metro Line 1 are also presented.