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Evaluation of cross wall performance on restraining the wall displacement and resisting the basal heave in deep excavations

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Abstract

The cross wall is commonly implemented to restrain the excessive wall displacement induced by deep excavation, which has been verified through comprehensive studies and case histories. However, no study has been conducted on the excavation stability with the cross wall, which is the main concern in the deep excavation problem. In this study, a series of three-dimensional finite element methods were carried out to evaluate the performance of cross walls in resisting the basal heave in deep excavations. The results concluded that the frictional resistance acting on the contact surface area between the cross wall and the surrounding soil plays an important role in the basal heave resistance. Thus, enlarging the dimension of the cross wall would enhance the frictional resistance area and increase the factor of safety. In addition, a new simplified method is proposed to estimate the factor of safety against basal heave for the case with and without the cross wall and further validated by the finite element results. Finally, a new design chart was introduced to predict the maximum wall displacement for deep excavations with the cross wall based on the proposed system stiffness ratio and factor of safety against basal heave, which was verified through the case histories.

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Acknowledgements

The authors acknowledge the support provided by the Ministry of Science and Technology in Taiwan [grant number MOST 109-2221-E-011-015-MY3].

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  1. Department of Civil and Construction Engineering, National Taiwan University of Science and Technology (Taiwan Tech), No. 43, Section 4, Keelung Rd, Da’an District, Taipei City, 10607, Taiwan

    Ari Surya Abdi & Chang-Yu Ou

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  1. Ari Surya Abdi
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Correspondence to Ari Surya Abdi.

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Abdi, A.S., Ou, CY. Evaluation of cross wall performance on restraining the wall displacement and resisting the basal heave in deep excavations. Acta Geotech. (2023). https://doi.org/10.1007/s11440-023-02142-6

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