Abstract
Abstract. Critical infrastructures in Shanghai have undergone uneven settlement since their operation, which plays an important role in affecting the security of Shanghai. This paper, taking rail transportation as example, investigates settlement characteristics and influencing factors of this linear engineering, based on long-term settlement monitoring data. Results show that rail settlement is related to geological conditions, regional ground subsidence, surrounding construction activities and structural differences in the rail systems. In order to effectively decrease the impact of regional ground subsidence, a monitoring and early-warning mechanism for critical infrastructure is established by the administrative department and engineering operators, including monitoring network construction, settlement monitoring, information sharing, settlement warning, and so on.
Highlights
Since the opening of Metro Line 1 in January 1990, a total of 11 rail lines have been put into operation in Shanghai, and the mileage has increased to 410 km in 2010
Line C exhibits a smooth trend in overall settlement, with a cumulative settlement of −4.4 mm from 2008 to 2010 (Fig. 3)
We compared the monitoring results of rail settlement and extensometer data, and found that the subsidence trend was consistent from the tunnel to the bedrock, and the soil compression below the tunnel floor played a controlling role in tunnel settlement
Summary
Since the opening of Metro Line 1 in January 1990, a total of 11 rail lines have been put into operation in Shanghai, and the mileage has increased to 410 km in 2010. These subway systems play a great role in relieving traffic congestion on the ground, which bring good social, economic and environmental benefits. The uneven settlement, caused by rail construction and operation, emerged in several lines, and resulted in negative impacts on rail safety and management(Chen and Zhan, 2000; Wang, 2009; Wang and Hang, 2004). The management for rail-settlement controls in Shanghai were introduced
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