Environmental effects of confined aquifer dewatering for cut and cover tunnels in floodplain areas of Yangtze River

WANG Jun; LIU Songyu; ZHANG Xinyuan; XU Haiyuan; WANG Xiaoqiong; LI Shilong; SUN Yanxiao

doi:10.11779/CJGE2024S20043

Volume 46 Issue S2

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Chinese Journal of Geotechnical Engineering > 2024 > 46(S2): 221-225. > DOI: 10.11779/CJGE2024S20043

WANG Jun, LIU Songyu, ZHANG Xinyuan, XU Haiyuan, WANG Xiaoqiong, LI Shilong, SUN Yanxiao. Environmental effects of confined aquifer dewatering for cut and cover tunnels in floodplain areas of Yangtze River[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(S2): 221-225. DOI: 10.11779/CJGE2024S20043

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Environmental effects of confined aquifer dewatering for cut and cover tunnels in floodplain areas of Yangtze River

1.
Jiangsu Provincial Transportation Engineering Construction Bureau, Nanjing 210004, China
2.
Southeast University, Nanjing 211189, China
3.
China Railway 14th Bureau Group Co., Ltd., Ji'nan 250101, China
4.
China Railway 14th Bureau Group Mega Shield Construction Engineering Co., Ltd., Nanjing 211800, China

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Received Date: June 21, 2024

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Abstract

Confined aquifer dewatering for cut and cover tunnels in the floodplain areas of Yangtze River characterized by complicated geological condition and high confined water level may result in considerable ground settlements, which may potentially cause structural damages and losses of life and property. Aiming at this issue, the finite element model for the confined aquifer dewatering is developed based on the southern part of a cut and cover tunnel of the Jiangyin-Jingjiang Yangtze River Tunnel Project, and the characteristics of drawdown, ground settlement and incline of a sensitive villa district are analyzed. The effects of various designs of curtain on the ground settlements are also studied. It is found that the settlements induced by the confined aquifer dewatering cannot converge fast. The maximum settlements of the villa district for 10, 30, 60 and 120 days of dewatering are 2.5, 4.3, 5.4 and 6.1 cm, respectively. The inclines converge faster with the maximum value of 0.0002, which meets the requirements of China's standard. The altered curtain design can reduce the maximum settlement in the villa district by 63.5%. Cutting off the second confined aquifer in the mainline can further reduce the maximum settlement with the highest efficiency.
- cut and cover tunnel,
- confined water,
- dewatering,
- environmental effect,
- numerical simulation

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