Areal subsidence under pumping well–curtain interaction in subway foundation pit dewatering: conceptual model and numerical simulations

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• 作者：Jianxiu Wang ; Yuanbin Wu ; Xiaotian Liu ; Tianliang Yang…
• 关键词：Subway foundation pit ; Dewatering ; Local subsidence ; Areal subsidence ; Numerical simulation
• 刊名：Environmental Earth Sciences
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：75
• 期：3
• 全文大小：1,762 KB
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• 作者单位：Jianxiu Wang (1) (2) (3)
  Yuanbin Wu (4)
  Xiaotian Liu (1)
  Tianliang Yang (5)
  Hanmei Wang (5)
  Yanfei Zhu (6)
  
  1. College of Civil Engineering, Tongji University, Shanghai, 200092, China
  2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai, 200092, China
  3. CCCC Key Lab of Environment Protection and Safety in Foundation Engineering of Transportation, Guangzhou, 510230, China
  4. Institute of Karst Geology, CAGS, Guilin, 541004, China
  5. Shanghai Institute of Geological Survey, Shanghai, 200072, China
  6. Shanghai Tunnel Engineering Corporation Ltd., Shanghai, 200082, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

Subway foundation pit dewatering may contribute to the regional land subsidence in a built-up area when aquifers are too thick to be cut off by a curtain. The land subsidence induced by subway foundation pit dewatering was divided into local subsidence and areal subsidence. The former was managed by construction organizations, while the latter was managed by a land resource, urban management, and hazard prevention department. The areal subsidence could not be recovered after dewatering because of its vast influence area and contribution to regional land subsidence. The boundary between local subsidence and areal subsidence was defined as the location of three times the foundation pit depth to the foundation pit boundary. The subsidence within the boundary belonged to local subsidence, whereas the subsidence outside the boundary belonged to areal subsidence. With Shanghai as background, the conceptual and mathematical models that considered hydrogeological conditions, curtain depth, and pumping well screens were established, and numerical simulations were performed. When the pumping well screens were enveloped by a diaphragm wall, the best vertical distance of about 1.0–4.0 m was obtained between the screen bottoms and curtain bottom. The decreasing rate of areal subsidence was the highest under the interaction of diaphragm wall and pumping well screens. Further increasing the penetration depth of the diaphragm wall and shortening the length of the pumping well screen were both less efficient.