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Performance of braced excavation in residual soil with groundwater drawdown

Underground Space 2018年第2期3卷 150-165页

作者： W.G.Zhang A.T.C.Goh K.H.Goh O.Y.S.Chew D.Zhou Runhong Zhang Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityChongqingChina School of Civil Engineering Chongqing UniversityChongqingChina School of Civil and Envirormental Engineering Nanyang Technological UniversitySingapore Civil Design Division Land Transport AuthoritySingapore Geotechmical cand Tunnels Division Land Transport AuthoritySingapore

In densely built-up Singapore,relatively stiffsecant-bored piles and diaphragm walls are commonly used in cut-and-cover works to minimize the impact of ground movement on the adjacent structures and *** excavations in stiffresidual soil deposits,the asso-ciated wall deﬂections and ground settlements are generally smaller than for excavations in soft soil ***,if the residual soil permeability is high and the underlying rock is highlyﬁssured or fractured,substantial groundwater drawdown and associated seepage-induced settlement may *** this study,the excavation performance of four sites in residual soil deposits with maximum excavation depths between 20 and 24 m is *** maximum wall deﬂections were found to be relatively small compared to the signiﬁcantly larger maximum ground settlements,owing to the extensive lowering of the groundwater *** this paper,details of the subsurface conditions,excavation support system,ﬁeld instrumentation,and observed excavation responses are presented,with particular focus on the large groundwater drawdown and associated ground ***ﬁc issues encountered during the excavation,as well as the effectiveness of various groundwater control measures,are *** case studies will provide useful references and insights for future projects involving braced excavations in residual soil.

关键词： Residual soil Braced excavation Wall deﬂection Ground settlements groundwater drawdown Strut force

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Influence of groundwater drawdown on excavation responses e A case history in Bukit Timah granitic residual soils

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第5期10卷 856-864页

作者： Wengang Zhang Wei Wang Dong Zhou Runhong Zhang A.T.C. Goh Zhongjie Hou National Joint Engineering Research Center of Geohazards Prevention in Reservoir Area Environment Chongqing University Chongqing 400045 China School of Civil Engineering Chongqing University Chongqing 400045 China School of Civil and Environmental Engineering Nanyang Technological University 639798 Singapore

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.

关键词： Braced excavation Bukit Timah granitic (BTG) residual soil Wall deflection groundwater drawdown Empirical charts

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Numerical Study on groundwater drawdown and Deformation Responses of Multi-Layer Strata to Pumping in a Confined Aquifer

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Journal of Shanghai Jiaotong university(Science) 2019年第3期24卷 287-293页

作者： WANG Dafa LI Mingguang CHEN Jinjian XIA Xiaohe ZHANG Yangqing School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University

Pumping artesian water from porous media inevitably reduces the groundwater head and promotes soil consolidation,which may result in regional land *** this study,a fluid-mechanical coupled numerical model is developed to investigate the dewatering-induced groundwater drawdown and deformation responses for multi-layer *** relation bet ween the stra tum deformation and groundwater drawdown is *** results show that the pumping process can be divided into four st *** development of vertical deformation is inconsistent with the change of the pore pressure for the strata except for the confined aquifer at the early stage of *** st rata expand while the pore pressures *** inconsistency may be due to the large unloading in the confined aquifer at the early stage of *** arch comes into being owing to the constraint of the surrounding soils when the large unloading occurs in the confined aquifer;this can reduce the stratum compression and cause the expansion of the *** can be concluded that as the pumping continues,the decrease of the pore pressure dominates the vertical deformation and results in the soil compression in all strata.

关键词： pumping multi-layer strata numerical analysis groundwater drawdown stratum deformation

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