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Open AccessArticle

Experimental Study and Estimation of Groundwater Fluctuation and Ground Settlement due to Dewatering in a Coastal Shallow Confined Aquifer

1
State Key Laboratory of Ocean Engineering, Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2
Shanghai Changkai Geotechnical Engineering Co., Ltd., Shanghai 200240, China
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2019, 7(3), 58; https://doi.org/10.3390/jmse7030058
Received: 18 February 2019 / Revised: 22 February 2019 / Accepted: 25 February 2019 / Published: 1 March 2019
(This article belongs to the Special Issue Coastal Geohazard and Offshore Geotechnics)
The coastal micro-confined aquifer (MCA) in Shanghai is characterized by shallow burial depth, high artesian head, and discontinuous distribution. It has a significant influence on underground space development, especially where the MCA is directly connected with deep confined aquifers. In this paper, a series of pumping well tests were conducted in the MCA located in such area to investigate the dewatering-induced groundwater fluctuations and stratum deformation. In addition, a numerical method is proposed for the estimation of hydraulic parameter, and an empirical prediction method is developed for dewatering-induced ground settlement. Test results show that groundwater drawdowns and soil settlement can be observed not only in MCA but also in the aquifers underneath it. This indicates that there is a close hydraulic connection among each aquifer. Moreover, the distributions and development of soil settlement at various depths are parallel to those of groundwater drawdowns in most areas of the test site except the vicinity of pumping wells, where collapse-induced subsidence due to high-speed flow may occur. Furthermore, the largest deformation usually occurs at the top of the pumping aquifer instead of the ground surface, because the top layer is expanded due to the stress arch formed in it. Finally, the proposed methods are validated to be feasible according to the pumping well test results and can be employed to investigate the responses of groundwater fluctuations and stratum deformations due to dewatering in MCA. View Full-Text
Keywords: pumping well test; groundwater fluctuation; stratum deformation; micro-confined aquifer pumping well test; groundwater fluctuation; stratum deformation; micro-confined aquifer
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MDPI and ACS Style

Li, J.; Li, M.-G.; Zhang, L.-L.; Chen, H.; Xia, X.-H.; Chen, J.-J. Experimental Study and Estimation of Groundwater Fluctuation and Ground Settlement due to Dewatering in a Coastal Shallow Confined Aquifer. J. Mar. Sci. Eng. 2019, 7, 58. https://doi.org/10.3390/jmse7030058

AMA Style

Li J, Li M-G, Zhang L-L, Chen H, Xia X-H, Chen J-J. Experimental Study and Estimation of Groundwater Fluctuation and Ground Settlement due to Dewatering in a Coastal Shallow Confined Aquifer. Journal of Marine Science and Engineering. 2019; 7(3):58. https://doi.org/10.3390/jmse7030058

Chicago/Turabian Style

Li, Jiong; Li, Ming-Guang; Zhang, Lu-Lu; Chen, Hui; Xia, Xiao-He; Chen, Jin-Jian. 2019. "Experimental Study and Estimation of Groundwater Fluctuation and Ground Settlement due to Dewatering in a Coastal Shallow Confined Aquifer" J. Mar. Sci. Eng. 7, no. 3: 58. https://doi.org/10.3390/jmse7030058

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