| 地下水开采引起的次压缩对隧道长期沉降的影响 |
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| 引用本文： | 刘国彬,李青,吴宏伟.地下水开采引起的次压缩对隧道长期沉降的影响[J].岩土力学,2012,33(12):3729-3735. |
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| 作者姓名： | 刘国彬 李青 吴宏伟 |
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| 作者单位： | 1.同济大学 地下建筑与工程系，上海 200092；2.香港科技大学 土木与环境工程系，香港 |
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| 基金项目： | 香港研究资助局(RGC)资助项目(No.GRF-618006) |
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| 摘 要： | 软土地区盾构隧道建成后往往伴随有明显的长期沉降，较大的隧道沉降会严重影响地铁系统的运营及安全。然而，目前对于软土地区隧道长期沉降机制的认识尚不明确。以上海地区地铁盾构隧道1999－2007年间的隧道沉降为例，通过室内试验及现场监测对引起隧道长期沉降的因素，特别对地下水开采引起的软土及砂土层次压缩进行了研究。结果表明，第4含水砂层具有明显的次压缩特性，抽取地下水引起的第4含水层的压缩，特别是其次压缩变形，是引起隧道长期沉降的主要原因之一。因此，严格控制该承压含水层地下水开采是目前缓解上海地铁隧道长期沉降的主要措施。
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| 关 键 词： | 隧道长期沉降 第4含水层 次压缩 地下水开采 |
| 收稿时间： | 2011-09-22 |
Influence of secondary compression due to groundwater mining on long-term tunnel settlement |
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| LIU Guo-bin,LI Qing,NG C W W.Influence of secondary compression due to groundwater mining on long-term tunnel settlement[J].Rock and Soil Mechanics,2012,33(12):3729-3735. |
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| Authors: | LIU Guo-bin LI Qing NG C W W |
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| Institution: | 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China |
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| Abstract: | Large long-term tunnel settlements are generally observed after the completion of shield tunnel construction in soft clay. It is well-recognized that significant tunnel settlements may pose a threat to the serviceability and safety of underground metro systems. However, the mechanisms of the observed large long-term tunnel settlement in soft clay are still not fully understood. Measured tunnel settlements of a metro line in Shanghai from 1999 to 2007 are studied. Several possible causes, especially secondary compressions of clay and sand layers due to groundwater mining, are investigated based on laboratory test and field monitoring results. Noticeable secondary compression of Aquifer IV was found in some areas in Shanghai. The compression of Aquifer IV, especially the secondary compression due to groundwater mining is one of the principal reasons for long-term tunnel settlement. Controlling groundwater mining in Aquifer IV is vital to minimize large tunnel settlement in Shanghai. |
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| Keywords: | long-term tunnel settlement aquifer IV secondary compression groundwater mining |
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