Determination of Efficiency Factors for Closely Spaced Strip Footings on Cohesive–Frictional Soils

Dulpinit Noo-Iad, Jim Shiau, Weeraya Chim-Oye, Pitthaya Jamsawang and Suraparb Keawsawasvong ()
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Dulpinit Noo-Iad: Department of Civil Engineering, Faculty of Engineering, Thammasat School of Engineering, Thammasat University, Pathumthani 12120, Thailand
Jim Shiau: School of Engineering, University of Southern Queensland, Toowoomba, QLD 4350, Australia
Weeraya Chim-Oye: Department of Civil Engineering, Faculty of Engineering, Thammasat School of Engineering, Thammasat University, Pathumthani 12120, Thailand
Pitthaya Jamsawang: Soil Engineering Research Center, Department of Civil Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
Suraparb Keawsawasvong: Department of Civil Engineering, Faculty of Engineering, Thammasat School of Engineering, Thammasat University, Pathumthani 12120, Thailand

Sustainability, 2023, vol. 15, issue 3, 1-17

Abstract: The bearing capacity of closely spaced footings has become one of the important topics in geotechnical engineering research owing to the rapid development in urban areas around the world. In this paper, we propose three efficiency factors that can be used to describe the bearing capacity effects of closely spaced footings using Terzaghi’s traditional bearing capacity equation. With an advanced finite-element limit analysis of upper and lower bounds, both the closely spaced strip footings and the multiple closely spaced strip footings on cohesive–frictional soil with a surcharge effect were investigated. The numerical results showed that the efficiency factors were significantly influenced by the internal frictional angle and the spacing ratio. Several comparisons were made with those published in the literature. Furthermore, the failure mechanisms of closely spaced footings are presented, while design charts were produced with a wide range of practical parameters. This study should be of great interest to foundation engineering practitioners.

Keywords: bearing capacity; interference; cohesive–frictional; footing; limit analysis (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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