Dewatering-Induced Stratified Settlement around Deep Excavation: Physical Model Study
Source abstract
Abstract
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.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Geotechnical Engineering and Analysis · Dam Engineering and Safety · Landslides and related hazards
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
College of Civil Engineering, Tongji University, Shanghai 200092, China
China Construction Eighth Engineering Division Corp., Ltd., Shanghai 200112, China
Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
Shanghai Institute of Geological Survey, Shanghai 200072, China
Key Laboratory of Land Subsidence Monitoring and Prevention of Ministry of Natural Resources, Shanghai 200072, China
Center 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, China
Funding
National Natural Science Foundation of China · Science and Technology Commission of Shanghai Municipality · Open Fund of Key Laboratory of Land Subsidence Monitoring and Prevention, Ministry of Natural Resources of China
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