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Investigation on Hetang earth fissure in south Jiangyin
Pages: 1-5
Year: Issue:  4
Journal: Geotechnical Investigation & Surveying

Keyword:  earth fissure; investigation; formation mechanism; Hetang; Jiangyin;
Abstract: The Hetang earth fissure was originally a small local ground crack in concrete pavement,started in 1995,whose continuous activity time had been over 12 years,and now is slow down.It is actually an earth fissure zone now composing of main fissure and its northwest associated depression 20 to 60m wide generally,its linear extension length is about 500m,and strike direction is northeast 20 degree.Due to the differential subsidence,the main fissure shaped as a 20~30cm high scarp,and there are a lot of small fissures in depression zone.It is verified by shallow seismic prospecting and drilling that there is bedrock ridge underlying porous Quaternary sediments directly below the main earth fissure,the depth of the uppermost ridge is about 64m,generally 140~150m deep in piedmont and underlying plain area,with slope angle of 12 to 15 degree.It is the dominant factor of earth fissure forming that long term deep groundwater excessive withdrawal result in confined aquifer sandy layer compaction a
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