Journal
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
Volume 116, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tust.2021.104124
Keywords
Deep excavation; Dewatering; Ground settlement; Wall movement; Groundwater seepage; Laboratory experiment; Deformation control
Funding
- National Natural Science Foundation of China [51978261, 51708206]
- China Post-doctoral Science Foundation [2019T120797]
- China Scholarship Council [201808430270]
- Natural Sci-ence Foundation of Hunan Province [2020JJ5193]
- Research Foundation of Education Bureau of Hunan Province [20A190]
- Systematic Project of Guangxi Key Laboratory of Disaster Prevention and Structural Safety [2019ZDK007]
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The study investigated the effects of buttress retaining walls on ground settlement during construction dewatering. Results showed that buttress walls significantly reduce ground settlement caused by foundation pit dewatering, with longer walls achieving greater reduction. However, the deformation-restraining efficiency of buttress walls reduces as their length increases in conditions with small drawdown from dewatering.
Dewatering with pumping wells placed inside an excavation is commonly adopted as groundwater control system to ensure the construction safety in water-rich strata. However, dewatering will cause both groundwater drawdown and retaining wall movement, which may together lead to serious ground settlement. Recently, a new earth retaining system, buttress retaining wall, is proposed to restrict the wall movement and the associated ground settlement induced by earth excavation, while its effectiveness in reducing dewatering-induced deformations is not investigated. A series of laboratory-scale experiments were performed based on a metro station to seek the effects of buttress retaining wall on ground settlement during construction dewatering. Miniature pumping wells were set up to effect the groundwater drawdown. The water level, pore water pressure, wall movement and ground surface settlement were monitored in real time, which were further compared quantitatively with flow net computation and some case records reported by former researchers. Results indicate that the use of buttress wall would significantly reduce the ground surface settlement due to foundation pit dewatering, and a greater reduction would appear in the case with longer buttress wall. However, in the condition with small drawdown incurred by dewatering, the deformation-restraining efficiency of buttress wall would reduce as its length increases.
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