Investigation of the Long-Term Tunnel Settlement Mechanisms of the First Metro Line in Shanghai
Investigation of the Long-Term Tunnel Settlement Mechanisms of the First Metro Line in Shanghai
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DOI：
10.1139/cgj-2012-0298
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发表时间：
2013-06
影响因子：
3.6
通讯作者：
C. Ng;Guo-bin Liu;Qing Li
中科院分区：
文献类型：
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作者：
C. Ng;Guo-bin Liu;Qing Li
地铁隧道的长期性能显然是负责其建设的当局和设计师的主要关注点，因为隧道过度沉降会影响整个地铁系统的可用性和安全性。本文对上海地铁1号线16.4km长隧道1994 ~ 2007年（12.5年）的长期沉降观测结果进行了分析和讨论。隧道沉降是连续的，随着时间的推移，并达到最大值为288毫米。为了协助调查的长期隧道沉降的机制，记录的地下水抽水和地下土壤压缩之间的1985年和2007年进行了分析。四个可能的原因-即，隧道施工的影响，由于运行列车，二次压缩软粘土，和地下水抽水桑迪含水层-进行了调查。通过对地下土体压缩量的测量，揭示了大断面隧道沉降主要是由地下土体的压缩引起的。
The long-term performance of a metro tunnel is obviously a major concern for the authority and designers responsible for its construction, as excessive tunnel settlement would affect the serviceability and safety of the entire metro system. In this study, measured long-term settlement of the 16.4 km long tunnel of Shanghai Metro Line 1 from 1994 to 2007 (a period of 12.5 years) is reported and discussed. The tunnel settlement was continuous with time, and reached a maximum of 288 mm. To assist in the investigation of the mechanisms of long-term tunnel settlement, records of groundwater pumping and subsurface soil compression between 1985 and 2007 are analyzed. Four possible causes — namely, effects of tunnel construction, cyclic loading due to running trains, secondary compression of soft clay, and groundwater pumping in sandy aquifers — are investigated. From the measurements of subsurface soil compression, it is revealed that the observed large tunnel settlement was mainly caused by the compression of s...