Finite Element Analysis of Two Nearby Interfering Strip Footings Embedded in Saturated Cohesive Soils

Mo'men Ayasrah, Mohammed Y. Fattah


The issue of interaction between nearby footings is of paramount practical significance. The interference effect should be taken into account since the footing may really be separated from or bounded by other footings on one or both sides. In this regard, this paper studies the effect of two nearby interfering strip footings embedded in saturated cohesive soils, which will help to provide a better understanding of the impact of footing depth on the interference effect. A numerical study is carried out using the finite element program (Midas GTS-NX), and the behavior of closely placed strip footings embedded in the saturated cohesive soils is investigated under the influence of different factors such as the spacing between footings, the depth of footings, soil undrained shear strength, and the groundwater table. It was concluded that the soil cohesion and the footing depth ratio have a notable influence on the interference of closely spaced footings. For all cohesion values, it has been observed that the spacing needed for interference to vanish decreases with an increase in the depth of the footing and water table. In addition, as the S/B ratio increases, the ultimate bearing capacity (UBC) of interfering footings decreases until it reaches the same value as an isolated footing at greater spacing. The UBC is approximately 10% higher at S/B = 1 compared to the isolated footing. However, at S/B = 1, the UBC of two footings achieves a value equal to that of an isolated footing and does not change when the S/B ratio increases. With increasing footing depth, there is an increase in UBC. Finally, the highest values of x were obtained in all cases when Cu = 40 kPa. This indicates that the interaction between footings is greater when the soil is softer.


Doi: 10.28991/CEJ-2023-09-03-017

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Finite Elements; Strip Footings; Interference; Saturated Clay; Bearing Capacity.


Das, S., Halder, K., & Chakraborty, D. (2022). Bearing capacity of interfering strip footings on rock mass. Geomechanics and Geoengineering, 17(3), 883–895. doi:10.1080/17486025.2021.1903091.

Shu, S., Gao, Y., Wu, Y., & Ye, Z. (2021). Undrained Bearing Capacity of Two Strip Footings on a Spatially Variable Soil with Linearly Increasing Mean Strength. International Journal of Geomechanics, 21(2). doi:10.1061/(asce)gm.1943-5622.0001904.

Wu, G., Zhao, M., Zhang, R., & Lei, M. (2021). Ultimate Bearing Capacity of Strip Footings on Hoek–Brown Rock Slopes Using Adaptive Finite Element Limit Analysis. Rock Mechanics and Rock Engineering, 54(3), 1621–1628. doi:10.1007/s00603-020-02334-6.

Das, S., & Chakraborty, D. (2022). Effect of Soil and Rock Interface Friction on the Bearing Capacity of Strip Footing Placed on Soil Overlying Hoek–Brown Rock Mass. International Journal of Geomechanics, 22(1), 4021257. doi:10.1061/(asce)gm.1943-5622.0002225.

Das, S., & Chakraborty, D. (2021). Effect of interface adhesion factor on the bearing capacity of strip footing placed on cohesive soil overlying rock mass. Frontiers of Structural and Civil Engineering, 15(6), 1494–1503. doi:10.1007/s11709-021-0768-y.

Acharyya, R., & Dey, A. (2023). Response of Skirted Strip Footing Resting on Layered Granular Soil Using 2-D Plane-Strain Finite Element Modeling. Geotechnical and Geological Engineering. doi:10.1007/s10706-022-02373-6.

Kumar, A., & Saran, S. (2003). Closely spaced footings on geogrid-reinforced sand. Journal of geotechnical and geoenvironmental engineering, 129(7), 660-664. doi:10.1061/(ASCE)1090- 0241(2003)129:7(660).

Ghosh, P., & Kumar, P. (2009). Interference effect of two nearby strip footings on reinforced sand. Contemporary Engineering Sciences, 2(12), 577-592.

Ghosh, P. (2013). Numerical studies on seismic interference of two nearby embedded shallow footings. Disaster Advances, 6(9):19–30.

Nainegali, L. S., Ghosh, P., & Basudhar, P. K. (2013). Interaction of nearby strip footings under inclined loading. Proceedings of the 18th international conference on soil mechanics and geotechnical engineering, 2-6 September, 2013, Paris, France.

Shokoohi, M. A., Veiskarami, M., & Hataf, N. (2019). A Numerical and Analytical Study on the Bearing Capacity of Two Neighboring Shallow Strip Foundations on Sand. Iranian Journal of Science and Technology - Transactions of Civil Engineering, 43(1), 591–602. doi:10.1007/s40996-018-0189-x.

Acharyya, R., Dey, A., & Kumar, B. (2020). Finite element and ANN-based prediction of bearing capacity of square footing resting on the crest of c-φ soil slope. International Journal of Geotechnical Engineering, 14(2), 176–187. doi:10.1080/19386362.2018.1435022.

Anaswara, S., & Shivashankar, R. (2019). A numerical study on interference effects of closely spaced strip footings on soils. International Journal of Civil Engineering and Technology, 10(3).

Boufarh, R., Saadi, D., & Laouar, M. S. (2020). Numerical Investigations on Seismic Bearing Capacity of Interfering Strip Footings. Soils and Rocks, 43(2), 247–259. doi:10.28927/SR.432247.

Meraz, M. M., Mehedi, M. T., & Mim, N. J., (2022). Analytical Prediction of Capacity Variation for Isolated Footings Considering Adjacent Foundations. Proceedings of the 6th International Conference on Civil Engineering for Sustainable Development (ICCESD 2022), 10-12 February, 2022, KUET, Khulna, Bangladesh.

Chen, W. F., & Saleeb, A. F. (1982). Constitutive equations for engineering materials, Vol. 1: Elasticity and modeling. Elsevier, Amsterdam, Netherlands.

Wang, G., & Sitar, N. (2004). Numerical analysis of piles in elasto-plastic soils under axial loading. 17th ASCE Engineering Mechanics Conference, 13-16 June, 2004, University of Delaware, Newark, United States.

Seol, H., Jeong, S., & Kim, Y. (2009). Load transfer analysis of rock-socketed drilled shafts by coupled soil resistance. Computers and Geotechnics, 36(3), 446–453. doi:10.1016/j.compgeo.2008.08.012.

Merifield, R. S., & Nguyen, V. Q. (2006). Two- and three-dimensional bearing-capacity solutions for footings on two-layered clays. Geomechanics and Geoengineering, 1(2), 151–162. doi:10.1080/17486020600632637.

Nguyen, V. Q., & Merifield, R. S. (2011). Undrained bearing capacity of surface footings near slopes. Australian Geomechanics, 46(1), 77.

Lee, J. K., Jeong, S., & Shang, J. Q. (2016). Undrained bearing capacity of ring foundations on two-layered clays. Ocean Engineering, 119, 47–57. doi:10.1016/j.oceaneng.2016.04.019.

Ouahab, M. Y., Mabrouki, A., Frank, R., Mellas, M., & Benmeddour, D. (2020). Undrained Bearing Capacity of Strip Footings Under Inclined Load on Non-homogeneous Clay Underlain by a Rough Rigid Base. Geotechnical and Geological Engineering, 38(2), 1733–1745. doi:10.1007/s10706-019-01127-1.

Ameratunga, J., Sivakugan, N., & Das, B. M. (2016). Correlations of Soil and Rock Properties in Geotechnical Engineering. Developments in Geotechnical Engineering. Springer, New Delhi, India. doi:10.1007/978-81-322-2629-1.

Stuart, J. G. (1962). Interference between foundations, with special reference to surface footings in sand. Geotechnique, 12(1), 15–22. doi:10.1680/geot.1962.12.1.15.

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DOI: 10.28991/CEJ-2023-09-03-017


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