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Deep Cement Mixed Walls with Steel Inclusions for Excavation Support

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Abstract

Deep cement mixed (DCM) walls are widely used in supporting excavations in many parts of the world. In this paper, a case study of an excavation supported by a DCM wall with steel inclusions is analysed using a three-dimensional finite element model and based on the coupled theory of nonlinear porous media. The DCM wall is constructed with wide flange steel inclusions. The stress–strain behaviour of the DCM wall section is simulated using an extended version of the Mohr–Coulomb model, which considers the strain-softening behaviour of DCM columns beyond yield. The computed lateral deformations are compared with the field measurements to validate the numerical modelling procedure. Using the same case study, the internal stability of the wall against bending and shear failure modes is investigated. In addition, the lateral pressure distribution along the wall length is investigated because in practice design is carried out considering a uniform pressure distribution assuming rigid wall movements. A parametric study was carried out to investigate the viability of DCM walls in supporting excavations by varying the spacing between steel inclusions, wall thickness and initial lateral earth pressure. Based on the results of the parametric study, guidelines are proposed to select the most efficient geometric arrangement of steel inclusions within DCM walls.

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Acknowledgements

The authors would like to acknowledge the financial assistance provided by the Australian Research Council for this research under the Discovery Grant DP1094309.

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Authors and Affiliations

  1. School of Computing, Engineering and Mathematics, University of Western Sydney, Locked Bag 1797, Penrith, NSW, 2751, Australia

    R. Nishanthan, D. S. Liyanapathirana & C. J. Leo

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  1. R. Nishanthan
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  2. D. S. Liyanapathirana
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  3. C. J. Leo
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Correspondence to D. S. Liyanapathirana.

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Nishanthan, R., Liyanapathirana, D.S. & Leo, C.J. Deep Cement Mixed Walls with Steel Inclusions for Excavation Support. Geotech Geol Eng 36, 3375–3389 (2018). https://doi.org/10.1007/s10706-018-0539-2

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  • DOI: https://doi.org/10.1007/s10706-018-0539-2

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