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Behaviour of Square Footing Due to the Effect of Adjacent Excavation in Sand

In today scenario, urbanization and related infrastructure development in the form of an excavation adjacent to the existing structure are inevitable. In this case, the stability of an existing structure closer to the excavation is a serious concern. The main issue here is that, what is the safe distance at which new construction can take place from the existing structure? There are many research articles that states on the failure of an existing structure due to new construction adjacent to it in the form of excavations. Given the above, the paper presents the numerical results based on the finite element analyses that were performed for various parameters to examine the behaviour of existing square footing due to the effect of adjacent excavations in loose sand using PLAXIS3D software. In the finite element analysis, the behaviour of the footing and sheet pile walls were modelled using a linear elastic material and the elastoplastic behaviour of soil was modelled using a Mohr-Coulomb model under drained conditions. The literature available on this topic reveals that the excavation dimensions, shape of the footing, depth of the footing, location of the footing from the excavation, relative stiffness factor and relative density of sand are influencing the response of existing footing. Two different shapes of excavations such as a long length with narrow excavation under plane strain condition and short length of excavation under three-dimensional conditions were considered in this study. Numerical results indicate that the response of the square footing due to the effect of adjacent excavations are very much significant and mainly depends on the size of the excavation. The vertical and horizontal displacement, bending moment of the footing is increasing with an increase in depth of excavation. The footing located very closer to the excavation is significantly influenced as compared to the footing located far away from the excavation. The safe location of the square footing based on the settlement criteria is found to be 1.3 m from the excavation for shorter length excavation under three-dimensional conditions and 10 m for longer length of excavation under three-dimensional conditions.

Excavation, PLAXIS 3D, Footing, Displacement, Stress

APA Style

Karthigeyan Shanmugam, Vishalatchi Ramasamy, Abhirami Bindu. (2021). Behaviour of Square Footing Due to the Effect of Adjacent Excavation in Sand. International Journal of Architecture, Arts and Applications, 7(3), 62-70. https://doi.org/10.11648/j.ijaaa.20210703.12

ACS Style

Karthigeyan Shanmugam; Vishalatchi Ramasamy; Abhirami Bindu. Behaviour of Square Footing Due to the Effect of Adjacent Excavation in Sand. Int. J. Archit. Arts Appl. 2021, 7(3), 62-70. doi: 10.11648/j.ijaaa.20210703.12

AMA Style

Karthigeyan Shanmugam, Vishalatchi Ramasamy, Abhirami Bindu. Behaviour of Square Footing Due to the Effect of Adjacent Excavation in Sand. Int J Archit Arts Appl. 2021;7(3):62-70. doi: 10.11648/j.ijaaa.20210703.12

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This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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