Earth fissures in Jiangsu Province,China and geological investigation of Hetang earth fissure |
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| Authors: | G Y Wang G You B Shi Z L Qiu H Y Li M Tuck |
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| Institution: | (1) Geological Survey of Jiangsu Province, 210018 Nanjing, China;(2) School of Science and Engineering, University of Ballarat, University Drive, Mt Helen, Ballarat, VIC, 3353, Australia;(3) Department of Geoscience, Nanjing University, 210093 Nanjing, China; |
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| Abstract: | Earth fissures are a geohazard in Jiangsu Province, China. They can be caused by earthquakes and active faults, underground
mining, groundwater extraction and landslides. In order to establish a provincial rehabilitation plan in Jiangsu, a range
of monitoring programs, surveys, geological investigations and modeling have been implemented or planned. One of the focuses
of the project is the land subsidence and earth fissures caused by excessive groundwater withdrawal in Suzhou, Wuxi and Changzhou
(Su-Xi-Chang) area, southern Jiangsu Province. Hetang earth fissure within the Su-Xi-Chang area was first reported in 1995
and a series of investigation has been conducted since then. The site investigations and geophysical survey in 1997 have recognized
the causative factor as the excessive groundwater drawdown coupled by the underlying bedrock ridge. An open trench excavation
in 2007 and a plane strain analysis suggest that Hetang earth fissures may have cracked from the bedrock ridge to ground surface.
Geological drilling in 2007 has further confirmed the existence and configuration of the ridge and extracted soil samples
for laboratory tests to obtain soil parameters for numerical analyses and modeling of land subsidence and earth fissures in
the Su-Xi-Chang area, Jiangsu, China. The laboratory tests are currently in progress and the result of numerical analyses
and modeling is expected to be presented in the near future. |
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