Field Pumping and Recharge Test Study for Confined Aquifers in Super-Large Deep Foundation Pit Group Sites
To ensure the stability of deep foundation pits in confined aquifers, dewatering is often required. However, pumping from confined aquifers in large deep foundation pit groups may lead to significant environmental deformations. Therefore, field pumping and recharge tests are required to guide design...
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MDPI AG
2025-04-01
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| Online Access: | https://www.mdpi.com/2075-5309/15/8/1383 |
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| author | Shuo Wang Weidong Wang Zhonghua Xu Qingjun Song Jiangu Qian |
| author_facet | Shuo Wang Weidong Wang Zhonghua Xu Qingjun Song Jiangu Qian |
| author_sort | Shuo Wang |
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| description | To ensure the stability of deep foundation pits in confined aquifers, dewatering is often required. However, pumping from confined aquifers in large deep foundation pit groups may lead to significant environmental deformations. Therefore, field pumping and recharge tests are required to guide design of groundwater and environmental deformation control scheme. Focusing on a super-large deep foundation pit group in Shanghai, single-well pumping, multi-well pumping, and recharge tests were conducted in distinct geological zones (normally consolidated area and paleochannel zone). The hydraulic connectivity and spatiotemporal patterns of groundwater drawdown and soil settlement were systematically analyzed. The results show that: (1) There exists a certain hydraulic connection between the first and second confined aquifers. In the paleochannel area, the aquitard between the micro-confined and the first confined aquifer is insufficient to completely block hydraulic connectivity. (2) The ratio of ground surface settlement to groundwater drawdown is about 3.4 mm/m, and the deep soil settlement is significantly or even greater than the surface settlement, so it is necessary to strengthen the monitoring of deep settlement. (3) Recharge can elevate the groundwater and reduce settlement; however, it is difficult to eliminate the variation in settlement along the vertical direction. |
| format | Article |
| id | doaj-art-059f622db1704a71b781226d7554da9a |
| institution | OA Journals |
| issn | 2075-5309 |
| language | English |
| publishDate | 2025-04-01 |
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| series | Buildings |
| spelling | doaj-art-059f622db1704a71b781226d7554da9a2025-08-20T02:17:20ZengMDPI AGBuildings2075-53092025-04-01158138310.3390/buildings15081383Field Pumping and Recharge Test Study for Confined Aquifers in Super-Large Deep Foundation Pit Group SitesShuo Wang0Weidong Wang1Zhonghua Xu2Qingjun Song3Jiangu Qian4Department of Geotechnical Engineering, Tongji University, Shanghai 200092, ChinaDepartment of Geotechnical Engineering, Tongji University, Shanghai 200092, ChinaEast China Architecture Design & Research Institute Co., Ltd., Shanghai 200011, ChinaEast China Architecture Design & Research Institute Co., Ltd., Shanghai 200011, ChinaDepartment of Geotechnical Engineering, Tongji University, Shanghai 200092, ChinaTo ensure the stability of deep foundation pits in confined aquifers, dewatering is often required. However, pumping from confined aquifers in large deep foundation pit groups may lead to significant environmental deformations. Therefore, field pumping and recharge tests are required to guide design of groundwater and environmental deformation control scheme. Focusing on a super-large deep foundation pit group in Shanghai, single-well pumping, multi-well pumping, and recharge tests were conducted in distinct geological zones (normally consolidated area and paleochannel zone). The hydraulic connectivity and spatiotemporal patterns of groundwater drawdown and soil settlement were systematically analyzed. The results show that: (1) There exists a certain hydraulic connection between the first and second confined aquifers. In the paleochannel area, the aquitard between the micro-confined and the first confined aquifer is insufficient to completely block hydraulic connectivity. (2) The ratio of ground surface settlement to groundwater drawdown is about 3.4 mm/m, and the deep soil settlement is significantly or even greater than the surface settlement, so it is necessary to strengthen the monitoring of deep settlement. (3) Recharge can elevate the groundwater and reduce settlement; however, it is difficult to eliminate the variation in settlement along the vertical direction.https://www.mdpi.com/2075-5309/15/8/1383super-large deep foundation pit groupspumping and recharge testconfined aquiferground settlementgroundwater drawdown |
| spellingShingle | Shuo Wang Weidong Wang Zhonghua Xu Qingjun Song Jiangu Qian Field Pumping and Recharge Test Study for Confined Aquifers in Super-Large Deep Foundation Pit Group Sites Buildings super-large deep foundation pit groups pumping and recharge test confined aquifer ground settlement groundwater drawdown |
| title | Field Pumping and Recharge Test Study for Confined Aquifers in Super-Large Deep Foundation Pit Group Sites |
| title_full | Field Pumping and Recharge Test Study for Confined Aquifers in Super-Large Deep Foundation Pit Group Sites |
| title_fullStr | Field Pumping and Recharge Test Study for Confined Aquifers in Super-Large Deep Foundation Pit Group Sites |
| title_full_unstemmed | Field Pumping and Recharge Test Study for Confined Aquifers in Super-Large Deep Foundation Pit Group Sites |
| title_short | Field Pumping and Recharge Test Study for Confined Aquifers in Super-Large Deep Foundation Pit Group Sites |
| title_sort | field pumping and recharge test study for confined aquifers in super large deep foundation pit group sites |
| topic | super-large deep foundation pit groups pumping and recharge test confined aquifer ground settlement groundwater drawdown |
| url | https://www.mdpi.com/2075-5309/15/8/1383 |
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