期刊
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
卷 10, 期 5, 页码 856-864出版社
SCIENCE PRESS
DOI: 10.1016/j.jrmge.2018.04.006
关键词
Braced excavation; Bukit Timah granitic (BTG) residual soil; Wall deflection; Groundwater drawdown; Empirical charts
资金
- Land Transport Innovation Fund (LTIF) - Land Transport Authority (LTA), Singapore
- China Postdoctoral Science Foundation [2017M620414]
- Special Funding for Postdoctoral Researchers in Chongqing [Xm2017007]
- Advanced Interdisciplinary Special Cultivation Program of Chongqing University [06112017CDJQJ208850]
Performances of a braced cut-and-cover excavation system for mass rapid transit (MRT) stations of the Downtown Line Stage 2 in Singapore are presented. The excavation was carried out in the Bukit Timah granitic (BTG) residual soils and characterized by significant groundwater drawdown, due to dewatering work in complex site conditions, insufficient effective waterproof measures and more permeable soils. A two-dimensional numerical model was developed for back analysis of retaining wall movement and ground surface settlement. Comparisons of these measured excavation responses with the calculated performances were carried out, upon which the numerical simulation procedures were calibrated. In addition, the influences of groundwater drawdown on the wall deflection and ground surface settlement were numerically investigated and summarized. The performances were also compared with some commonly used empirical charts, and the results indicated that these charts are less applicable for cases with significant groundwater drawdowns. It is expected that these general behaviors will provide useful references and insights for future projects involving excavation in BTG residual soils under significant groundwater drawdowns. (C) 2018 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V.
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