Investigations of Changjing earth fissures, Jiangyin, Jiangsu, China

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• 作者：Guang-ya Wang ; G. You ; Jin-qi Zhu ; Jun Yu ; Xu-long Gong…
• 关键词：Differential land subsidence ; Earth fissure ; Groundwater extraction ; Quaternary sediments ; Temporal differential
• 刊名：Environmental Earth Sciences
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：75
• 期：6
• 全文大小：2,441 KB
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• 作者单位：Guang-ya Wang (1)
  G. You (2)
  Jin-qi Zhu (1)
  Jun Yu (1)
  Xu-long Gong (1)
  Jian-qiang Wu (1)
  
  1. Key Laboratory of Earth Fissures Geological Disaster, Ministry of Land and Resources (Geological Survey of Jiangsu Province), Nanjing, 210018, China
  2. School of Engineering and Information Technology, Federation University Australia, University Drive, Mt. Helen, VIC, 3353, Australia
  
• 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

Fissuring of the earth began at Changjing, Jiangyin City, Jiangsu Province, in 1995. The earth fissure zone consists of a main fissure with a number of secondary fissures on both sides, which range from 20 to 60 m wide. The main fissure is about 500 m long, trends 15° to 30°, and has a scarp 100–200 mm high. Extensive field investigations, including shallow seismic surveys and geological drilling, have been conducted over 20 years. Deposits of a Quaternary paleoriver at 150–160 m depth curve around a bedrock spur which is situated beneath, and lies parallel to, the fissure at about 90 m. A regional trough has formed due to land subsidence over the paleoriver channel, with Changjing at its eastern edge. The fissures resulted from differential subsidence of the Quaternary deposits as a result of extended over-exploitation of groundwater. Groundwater extraction facilitates compaction of the Quaternary aquifers and aquitards from the increase of the effective in situ stresses, which leads to subsidence. Positive relief of the subsurface bedrock defines the location and formation of the earth fissures. On one hand, differential subsidence causes the Quaternary sediments to rotate over the ridge, leading to tensional cracking. On the other hand, temporal differential in subsiding aggravates the vertical shearing or faulting of the fissure, forming a scarp.