Dewatering-Induced Stratified Settlement around Deep Excavation: Physical Model Study
The multi-aquifer and multi-aquitard system (MAMA) is a typical geological structure in deltas. Thus, the risks and challenges to settlement control and environmental protection are increased when demand for underground space extends to deeper strata. In this study, dewatering-induced stratified set...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-09-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/18/8929 |
| _version_ | 1797491625972203520 |
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| author | Xiaotian Liu Jianxiu Wang Tianliang Yang Lujun Wang Na Xu Yanxia Long Xinlei Huang |
| author_facet | Xiaotian Liu Jianxiu Wang Tianliang Yang Lujun Wang Na Xu Yanxia Long Xinlei Huang |
| author_sort | Xiaotian Liu |
| collection | DOAJ |
| description | The multi-aquifer and multi-aquitard system (MAMA) is a typical geological structure in deltas. Thus, the risks and challenges to settlement control and environmental protection are increased when demand for underground space extends to deeper strata. In this study, dewatering-induced stratified settlement in MAMA is divided into three stages according to whether the overlying aquitard is coupled with groundwater seepage. Subsequently, large physical model tests were carried out. Seepage and compression in the overlying strata come after the compression in the confined aquifer and the coordinated deformation in the overlying strata. The soil is compressed under the seepage drive within the hydraulic gradient range, while the soil above it is still affected by coordinated deformation and shows expansion. Dewatering-induced uneven settlement will cause damage to existing foundations and underground structures. Large-scale and uninterrupted excavation and dewatering are the main reasons for the continuous development of land subsidence. Although artificial groundwater recharging can reduce the settlement of the existing building, underground structure, and surrounding strata, a reasonable space arrangement is needed. |
| first_indexed | 2024-03-10T00:51:59Z |
| format | Article |
| id | doaj.art-8b7a4786866f44338255d140afd2ba63 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T00:51:59Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-8b7a4786866f44338255d140afd2ba632023-11-23T14:50:21ZengMDPI AGApplied Sciences2076-34172022-09-011218892910.3390/app12188929Dewatering-Induced Stratified Settlement around Deep Excavation: Physical Model StudyXiaotian Liu0Jianxiu Wang1Tianliang Yang2Lujun Wang3Na Xu4Yanxia Long5Xinlei Huang6College of Civil Engineering, Tongji University, Shanghai 200092, ChinaCollege of Civil Engineering, Tongji University, Shanghai 200092, ChinaShanghai Institute of Geological Survey, Shanghai 200072, ChinaCenter for Hypergravity Experimental and Interdisciplinary Research, Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, ChinaCollege of Civil Engineering, Tongji University, Shanghai 200092, ChinaCollege of Civil Engineering, Tongji University, Shanghai 200092, ChinaShanghai Institute of Geological Survey, Shanghai 200072, ChinaThe multi-aquifer and multi-aquitard system (MAMA) is a typical geological structure in deltas. Thus, the risks and challenges to settlement control and environmental protection are increased when demand for underground space extends to deeper strata. In this study, dewatering-induced stratified settlement in MAMA is divided into three stages according to whether the overlying aquitard is coupled with groundwater seepage. Subsequently, large physical model tests were carried out. Seepage and compression in the overlying strata come after the compression in the confined aquifer and the coordinated deformation in the overlying strata. The soil is compressed under the seepage drive within the hydraulic gradient range, while the soil above it is still affected by coordinated deformation and shows expansion. Dewatering-induced uneven settlement will cause damage to existing foundations and underground structures. Large-scale and uninterrupted excavation and dewatering are the main reasons for the continuous development of land subsidence. Although artificial groundwater recharging can reduce the settlement of the existing building, underground structure, and surrounding strata, a reasonable space arrangement is needed.https://www.mdpi.com/2076-3417/12/18/8929multi-aquifer and multi-aquitard systemstratified settlementfoundation pit dewateringphysical model testcoordinated deformation |
| spellingShingle | Xiaotian Liu Jianxiu Wang Tianliang Yang Lujun Wang Na Xu Yanxia Long Xinlei Huang Dewatering-Induced Stratified Settlement around Deep Excavation: Physical Model Study Applied Sciences multi-aquifer and multi-aquitard system stratified settlement foundation pit dewatering physical model test coordinated deformation |
| title | Dewatering-Induced Stratified Settlement around Deep Excavation: Physical Model Study |
| title_full | Dewatering-Induced Stratified Settlement around Deep Excavation: Physical Model Study |
| title_fullStr | Dewatering-Induced Stratified Settlement around Deep Excavation: Physical Model Study |
| title_full_unstemmed | Dewatering-Induced Stratified Settlement around Deep Excavation: Physical Model Study |
| title_short | Dewatering-Induced Stratified Settlement around Deep Excavation: Physical Model Study |
| title_sort | dewatering induced stratified settlement around deep excavation physical model study |
| topic | multi-aquifer and multi-aquitard system stratified settlement foundation pit dewatering physical model test coordinated deformation |
| url | https://www.mdpi.com/2076-3417/12/18/8929 |
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