Geomechanics and Engineering

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MARS inverse analysis of soil and wall properties for braced excavations in clays

  • Zhang, Wengang (Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University) ;
  • Zhang, Runhong (School of Civil Engineering, Chongqing University) ;
  • Goh, Anthony. T.C. (School of Civil and Environmental Engineering, Nanyang Technological University)
  • Received : 2016.08.29
  • Accepted : 2018.10.12
  • Published : 2018.12.30
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Abstract

A major concern in deep excavation project in soft clay deposits is the potential for adjacent buildings to be damaged as a result of the associated excessive ground movements. In order to accurately determine the wall deflections using a numerical procedure such as the finite element method, it is critical to use the correct soil parameters such as the stiffness/strength properties. This can be carried out by performing an inverse analysis using the measured wall deflections. This paper firstly presents the results of extensive plane strain finite element analyses of braced diaphragm walls to examine the influence of various parameters such as the excavation geometry, soil properties and wall stiffness on the wall deflections. Based on these results, a multivariate adaptive regression splines (MARS) model was developed for inverse parameter identification of the soil relative stiffness ratio. A second MARS model was also developed for inverse parameter estimation of the wall system stiffness, to enable designers to determine the appropriate wall size during the preliminary design phase. Soil relative stiffness ratios and system stiffness values derived via these two different MARS models were found to compare favourably with a number of field and published records.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China

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