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Numerical Analysis on the Settlement of an Isolated Footing due to Nearby Excavation

Mufakkir Rahman, Touhidul Islam, Pritul Ghosh, Shafiqul Islam, Nusrat Jahan

Abstract


In densely populated cities, there can be multiple construction work going on simultaneously within a very small area. This raises some serious concerns because, ground excavation during construction can have significant impact on structures at close proximity. This study performs three-dimensional FEM analysis in Plaxis 3D to observe the effects of ground excavation works near a shallow isolated footing in different types of soils and at various distances from the excavation pit. From the analysis, the maximum foundation settlement caused by excavation works in soft clay, medium dense sand, and stiff sandy clay was found at 1.5 m, 3 m & 5 m distances from the pit of excavation correspondingly. Foundation settlement caused by excavation works on medium dense sand and stiff sandy clay was moderate but abrupt & unsafe on soft clay soil under the given circumstances.

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