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Geomechanics and Engineering
  Volume 16, Number 6, December30 2018, pages 635-642

A simple model for ground surface settlement induced by braced excavation subjected to a significant groundwater drawdown
Runhong Zhang, Wengang Zhang, A.T.C. Goh, Zhongjie Hou and Wei Wang

    Braced excavation systems are commonly required to ensure stability in construction of basements for shopping malls, underground transportation and other habitation facilities. For excavations in deposits of soft clays or residual soils, stiff retaining wall systems such as diaphragm walls are commonly adopted to restrain the ground movements and wall deflections in order to prevent damage to surrounding buildings and utilities. The ground surface settlement behind the excavation is closely associated with the magnitude of basal heave and the wall deflections and is also greatly influenced by the possible groundwater drawdown caused by potential wall leakage, flow from beneath the wall, flow from perched water and along the wall interface or poor panel connections due to the less satisfactory quality. This paper numerically investigates the influences of excavation geometries, the system stiffness, the soil properties and the groundwater drawdown on ground surface settlement and develops a simplified maximum surface settlement Logarithm Regression model for the maximum ground surface settlement estimation. The settlements estimated by this model compare favorably with a number of published and instrumented records.
Key Words
    ground surface settlement; logarithm regression; braced excavation; water drawdown
Runhong Zhang, Zhongjie Hou and Wei Wang: School of Civil Engineering, Chongqing University, Chongqing, China

Wengang Zhang: 1.) Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing, China
2.) National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas, Chongqing University, Chongqing, China
3.) School of Civil Engineering, Chongqing University, Chongqing, China

A.T.C. Goh: School of Civil and Environmental Engineering, Nanyang Technological University, Singapore

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