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Keywords

bearing capacity, Centrifuge modeling, Ring footing, inclined surface, numerical analysis

Document Type

Research Paper

Abstract

Ring footings are a crucial foundation type for supporting large and tall structures, as they enhance structural stability, mitigate the risk of overturning, and resist lateral forces. Compared with conventional circular foundations, ring footings also provide savings in construction materials and overall cost. This study examines the behavior of ring footings with radius ratios of n = 0.25, 0.5, and 0.75. The models consist of steel footings with a thickness of 50 mm and an area of 2200 mm², placed on granular sandy soil with a dried unit weight of 16 kN/m³ and a relative density of 50%. The footings were positioned at a distance of b/Do​=1 from the slope crest to assess the influence of inclined surfaces. Centrifuge modeling was employed to simulate realistic field stresses, while numerical analyses were performed using PLAXIS 3D to verify and supplement the experimental data. The results show that the bearing capacity of ring foundations decreases as the surface inclination increases from 10° to 20°. On average, this reduction is about 10–15%, indicating the significant effect of slope angle on foundation performance. Furthermore, increasing the radius ratio of the footing leads to an additional decrease in bearing capacity, which aligns with previous studies. The combined experimental and numerical approach highlights the importance of considering slope inclination and geometry in the design of ring footings. These findings offer practical guidance for enhancing foundation stability and cost efficiency in geotechnical engineering applications involving sloping sandy soils.

References

M. L. Ohri, D. G. M. Purhit, M. L. Dubey, Behavior of ring footings on dune sand overlaying dense sand, In Pres. International Conference of Civil Engineers, Tehran, Iran, 1997. Bowles, J. E., Guo,Y. Foundation Analysis and Design; 5thEdition. McGraw-Hill, New York, 1997. J. H. Boushehrian, N. Hataf, Experimental and numerical investigation of the bearing capacity of model circular and ring footings on reinforced sand, Geotext. Geomembr., 21 (2003) 241-256. https://doi.org/10.1016/S0266-1144(03)00029-3 E. Naderi, N. Hataf, Model testing and numerical investigation of interference effect of closely spaced ring and circular footings on reinforced sand, Geotext. Geomembr., 42 (2014) 191-200.‏ https://doi.org/10.1016/j.geotexmem.2013.12.010 V. Sharma, A. Kumar, Strength and bearing capacity of ring footings resting on fiber-reinforced sand, Int. J. Geosynth. Ground Eng., 3 (2017) 1-17. https://doi.org/10.1007/s40891-017-0086-6 D. Shankar, V. Kumar‏, A Comparative Study on Experimental and Theoretical Bearing Capacity of Ring Footings, i-manager's J. Struct. Eng., 7 (2018) 63-69. https://doi.org/10.26634/jste.7.2.14486 Zhu, F. Centrifuge modelling and numerical analysis of bearing capacity of ring foundations on sand. Ph.D. Thesis, Memorial University of Newfoundland), 1998. C. Tang, K. K. Phoon‏ , Prediction of Bearing Capacity of Ring Foundation on Dense Sand about Stress Level Effect, Int. J. Geomech.,18 (2018)1-12. https://doi.org/10.1061/(ASCE)GM.1943-5622.0001312 H. Rupani, M. Bhoi‏, Experimental Study of Load Settlement Behaviour of Ring Footings for Different Internal Diameter Keeping the Contact Surface Area Same, Proceedings of the 4th World Congress on Civil, Structural, and Environmental Engineering (CSEE’19), Rome, Italy, 2019, 167. https://doi.org/10.11159/icgre19.167 S. D. Prasad, M. Chakraborty‏, Bearing capacity of ring footing resting on two layered soil, Comput. Geotech., 134 (2021) 104088. https://doi.org/10.1016/j.compgeo.2021.104088 B. A. Al-Dawoodi, M. Q. Waheed, F. H. Rahil‏, Comparison between theoretical and experimental behavior of shallow foundation in cohesive soil, Eng. Technol. J., 39 (2021) 1911-1918.‏ http://doi.org/10.30684/etj.v39i12.2124 M. R. Mahmood, S. F. Al-Wakel, M. S. Mohammed, Effect of partial saturation on ultimate bearing capacity of skirted foundations, Eng. Technol. J., 40 (2022) 710-721.‏ http://doi.org/10.30684/etj.v40i5.2259 N. Salih, T. Abdalla, F. Ahmed‏, Soil-foundation interaction and its influences on some geotechnical properties of Sulaimaniyah, northern Iraq, fine-grained soils utilising Plaxis 3D, Eng. Technol. J., 41 (2023) 642-651.‏ http://doi.org/10.30684/etj.2022.136345.1310 K. A. E. Al-Janabi, L. N. Snodi, A. J. Zedan‏, Ring Footing Bearing Capacity Erected on Dry Gypseous Soil, Tikrit J. Eng. Sci., 31 (2024) 1-9. https://doi.org/10.25130/tjes.31.3.1 A. Porbaha, D. J. Goodings, Geotextile reinforced cohesive slopes on weak foundations, Proceedings of the International Conference Centrifuge’94, Rotterdam, Netherlands, 1994, 623–628. A. Porbaha, D. J. Goodings, 1996, Centrifuge modeling of geotextile-reinforced cohesive soil retaining walls, J. Geotech. Eng., 122 (1996) 840–848. https://doi.org/10.1061/(ASCE)0733-9410(1996)122:10(840) B. V. S. Viswanadham, R. R. Mahajan,Centrifuge model tests on geotextile reinforced slopes, Geosynth. Int., 14 (2007) 365–379. https://doi.org/10.1680/gein.2007.14.6.365 C. T. Akdag, G. Özden‏, Nonlinear behavior of reinforced concrete (RC) and steel fiber added RC (WS-SFRC) model piles in medium dense sand, Constr. Build. Mater.,48 (2013) 464-472. https://doi.org/10.1016/j.conbuildmat.2013.07.024 M. Al-Neami, M. Wasmi, Influence of cyclic loading on performance of steel piles in sandy soil, Paper presented at the MATEC Web of Conferences, 162, 2018, 1-9. https://doi.org/10.1051/matecconf/201816201012 J. I. Clark, J. L.Robinson, Evaluation and Performance of the Calgary Tower Foundation. In Proceedings of the 25th Canadian Geotechnical Conference, Ottawa,‏ 1972. S. Dasgupta, D. Sengupta, Analysis of Ring Foundation and Circular Footing on Elastic Foundation using Curved Isoparametric Beam Element, J. Inst. Eng. India, Civ. Eng. Div., 69 (1989) 252-256. H. Javdanian, On the behavior of shallow foundations constructed on reinforced soil slope–a numerical analysis, Int. J. Geotech. Eng., 14 (2020) 188-195.‏ https://doi.org/10.1080/19386362.2017.1416971 Das, B. M. Shallow foundations: Bearing capacity and settlement; CRC Press, 2017.‏ https://doi.org/10.1201/9781315163871 Das, B. M., Sivakugan, N. Principles of foundation engineering; Cengage learning, 2018.‏ H. T. Chen, W. Y. Hung, C. C. Chang, Y. J. Chen, Centrifuge modeling test of a geotextile-reinforced wall with a very wet clayey backfill, Geotextiles and Geomembranes, 25 (2007) 346–359. https://doi.org/10.1016/j.geotexmem.2007.01.003 Mahajan, R. R. Centrifuge Model Studies on Geosynthetic Reinforced Soil Slopes. Ph.D. Thesis, Indian Institute of Technology Bombay, India, 2007. J. A. R. Jabur, M. R. Mahmood, S. F. Abbas‏, The Effect of Installation Torque on the Behavior of Helical Piles under Compression Load Tested by Centrifuge Device, IOP Conf. Ser.: Mater. Sci. Eng.,1094, 2021, 012091. https://doi.org/10.1088/1757-899X/1094/1/012091 K. Bhushan, F. Boniadi, Settlement of a Ring Foundation using Cone Data, Cone Penetration Testing, International Symposium on penetration testing, Balkema, Rotterdam, 1988, 681-686. G. G. Meyerhof, The ultimate bearing capacity of foundations on slopes, In: Proc., 4th Int. Conf. on Soil Mechanics and Foundation Engineering, 3 ,1957, 384-386.‏ S. Benmebarek, M. S. Remadna, N. Benmebarek, L. Belounar‏, Numerical evaluation of the bearing capacity factor Nγ′ of ring footings, Comput. Geotech., 44 (2012) 132-138. https://doi.org/10.1016/j.compgeo.2012.04.004 D. Raj, M. Bharathi, Bearing capacity of shallow foundation on slope: a review, In Proceedings of the 4th ICSMFE, 2013. ‏ N. Hataf, A. Fatolahzadeh, An experimental and numerical study on the bearing capacity of circular and ring footings on rehabilitated sand slopes with geogrid, J. Rehabil. Civ. Eng., 7 (2019) 174-185. https://doi.org/10.22075/jrce.2018.11576.1193 R. Vali, E. Alinezhad, M. Fallahi, M. Beygi, M .Saberian, J. Li‏, Developing a novel big dataset and a deep neural network to predict the bearing capacity of a ring footing, J. Rock Mech. Geotech., 16 (2024) 4798-4813. https://doi.org/10.1016/j.jrmge.2024.02.016 Coduto, D. P., Yeung, M. R., Kitch, W. A. Geotechnical engineering: principles and practices; pearson, 2011.‏ Das, B. M. Advanced soil mechanics; CRC press, 2019.‏ https://doi.org/10.1201/9781351215183 K. Chouhan, V. Q. Lai, J. T. Chavda, K. Yoonirundorn, S. Keawsawasvong‏, Evaluation of bearing capacity of ring footing with varying base roughness using finite element limit analysis, Transp. Infrastruct. Geotech., 11 (2024) 381-405.‏ https://doi.org/10.1007/s40515-023-00286-2

Highlights

Behavior of ring footings with radius ratios of n = 0.25, 0.5, and 0.75 was investigated. The bearing capacity of ring foundations decreases as the surface inclination increases from 10° to 20°. Numerical simulations of the ring foundations were carried out using the PLAXIS 3D finite element program. The bearing capacity of ring footings decreased by 15% when the slope angle increased from 10° to 20°.

DOI

10.30684/etj.2025.156504.1891

First Page

1015

Last Page

1022

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