NDLI: Sand creep as a factor in land subsidence during groundwater level recovery in the southern Yangtze River delta, China

Content Provider	Springer Nature Link
Author	Wang, Fei Miao, Linchang Lu, Weihua
Copyright Year	2013
Abstract	A number of areas worldwide are suffering from the land subsidence, including the southern Yangtze River delta, the most developed area in China. Land subsidence is mainly induced by excessive groundwater pumping and has caused numerous problems, for example, flooding, structural cracking, and ground fissuring. Although several countermeasures have been adopted to mitigate the land subsidence problem in the southern Yangtze River delta, commonly using groundwater recharge, land subsidence is still developing even when groundwater levels are rising. The observation data of land subsidence in each stratum show that the deformation of the pumped aquifer is even greater than that in the adjacent aquitards when groundwater levels are recovering. Laboratory test results on the aquifer sand in Shanghai and Changzhou (two cities in the studied area, which have the most sufficient observation data about the land subsidence and groundwater level developing with time) proved that sand creep deformation is significant and is partially responsible for the land subsidence without groundwater level drawdown. Considering the difficulty and cost of collecting borehole samples from deep pumped aquifers to obtain the essential parameters for the existing sand creep calculation models, a simplified method was then proposed to calculate the sand creep deformation in the pumped aquifer. The relationship between the sand creep rate and the time can be recognized as linear using double logarithmic coordinates and the slope can be assumed to be one. In the proposed method, the laboratory test data are not necessary. Finally, case histories from Shanghai and Changzhou were used to verify the effectiveness of the proposed method.
Starting Page	273
Ending Page	283
Page Count	11
File Format	PDF
ISSN	14359529
Journal	Bulletin of the International Association of Engineering Geology - Bulletin de l'Association Internationale de Géologie de l'Ingénieur
Volume Number	72
Issue Number	3-4
e-ISSN	14359537
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-06-11
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Land subsidence Sand creep Groundwater level recovering Geotechnical Engineering & Applied Earth Sciences Geoengineering, Foundations, Hydraulics Geoecology/Natural Processes Nature Conservation
Content Type	Text
Resource Type	Article
Subject	Geology Geotechnical Engineering and Engineering Geology

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