Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/89053
Title: Influence of groundwater drawdown on excavation responses – A case history in Bukit Timah granitic residual soils
Authors: Zhang, Wengang
Wang, Wei
Zhou, Dong
Zhang, Runhong
Goh, Anthony Teck Chee
Hou, Zhongjie
Keywords: Bukit Timah Granitic (BTG) Residual Soil
DRNTU::Engineering::Civil engineering
Braced Excavation
Issue Date: 2018
Source: Zhang, W., Wang, W., Zhou, D., Zhang, R., Goh, A. T. C., & Hou, Z. (2018). Influence of groundwater drawdown on excavation responses – A case history in Bukit Timah granitic residual soils. Journal of Rock Mechanics and Geotechnical Engineering, in press. doi:10.1016/j.jrmge.2018.04.006
Series/Report no.: Journal of Rock Mechanics and Geotechnical Engineering
Abstract: 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.
URI: https://hdl.handle.net/10356/89053
http://hdl.handle.net/10220/46037
ISSN: 1674-7755
DOI: http://dx.doi.org/10.1016/j.jrmge.2018.04.006
Rights: © 2018 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).
metadata.item.grantfulltext: open
metadata.item.fulltext: With Fulltext
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