Cover
Vol. 1 No. 1 (2025)

Published: December 14, 2025

Pages: 47-54

Research Article

Numerical Study of a Ring Foundation Behavior on Sandy Slopes Utilizing PLAXIS 3D Software

Ahmed Raad Dawood 1 Ihsan Al-abboodi Mazin Abdulimam Ahmed
1Department of Civil Engineering, College of Engineering, University of Basrah, Iraq
History
  • Received: August 22, 2025
  • Revised: September 17, 2025
  • Accepted: November 14, 2025
  • Available Online: December 14, 2025

Abstract

The performance of foundations located adjacent to natural slopes continues to pose significant technical challenges in geotechnical engineering, attributed to compromised soil stability, reduced bearing capacity, and increased foundation settlement. These phenomena are especially pronounced for ring foundations, which are adopted extensively for axi-symmetric superstructures such as silos, oil tanks, chimneys, and wind turbines. PLAXIS 3D software was used for numerical analysis. Some of the most critical parameters studied are the effect of soil properties and the differential settlement between two different regions on the ring foundation. The internal stress responses of the foundation structure, including the distribution of shear force and bending moment, are also studied. Important soil properties, including the friction angle and elastic modulus, exert comparable influences on foundation performance. The research reveals differential settlement between nodes situated nearest the slope and those positioned farther away. The resultant of bending and shearing forces in the ring foundation is proven to be most greatly influenced by slope geometry. The results are essential for the foundation of modern construction. The data will lead to the development of resilient designs for ring foundations on slopes.

Keywords

References

  1. Kusakabe, O., Kimura, T., & Yamaguchi, H. (1981). Bearing capacity of slopes under strip loads on the top surfaces. Soils and foundations, 21(4), 29-40.
  2. M. Laman and A. Yildiz, “Model studies of ring foundations on geogrid-reinforced sand,” 2003.
  3. J. H. Boushehrian and N. Hataf, “Experimental and numerical investigation of the bearing capacity of model circular and ring footings on reinforced sand,” Geotextiles and Geomembranes, vol. 21, no. 4, pp. 241–256, 2003, doi: 10.1016/S0266-1144(03)00029-3.
  4. J. Kumar and P. Ghosh, “Bearing capacity factor Nγ for ring footings using the method of characteristics,” Canadian Geotechnical Journal, vol. 42, no. 5, pp. 1474–1484, Oct. 2005, doi: 10.1139/t05-051.
  5. S. Benmebarek, M. S. Remadna, N. Benmebarek, and L. Belounar, “Numerical evaluation of the bearing capacity factor Nγ’ of ring footings,” Comput Geotech, vol. 44, pp. 132–138, Jun. 2012, doi: 10.1016/j.compgeo.2012.04.004.
  6. J. Kumar and M. Chakraborty, “Bearing Capacity Factors for Ring Foundations,” Journal of Geotechnical and Geoenvironmental Engineering, vol. 141, no. 10, Oct. 2015, doi: 10.1061/(asce)gt.1943-5606.0001345.
  7. W. R. Azzam and A. Z. ElWakil, “Experimental and Numerical Studies of Circular Footing Resting on Confined Granular Subgrade Adjacent to Slope,” International Journal of Geomechanics, vol. 16, no. 1, Feb. 2016, doi: 10.1061/(asce)gm.1943-5622.0000500.
  8. E. Seyedi Hosseininia, “Bearing Capacity Factors of Ring Footings,” Iranian Journal of Science and Technology - Transactions of Civil Engineering, vol. 40, no. 2, pp. 121–132, Jun. 2016, doi: 10.1007/s40996-016-0003-6.
  9. M. S. Remadna, S. Benmebarek, and N. Benmebarek, “Numerical evaluation of the bearing capacity factor N’c of circular and ring footings,” Geomechanics and Geoengineering, vol. 12, no. 1, pp. 1–13, Jan. 2017, doi: 10.1080/17486025.2016.1153729.
  10. A. Keshavarz and J. Kumar, “Bearing capacity computation for a ring foundation using the stress characteristics method,” Comput Geotech, vol. 89, pp. 33–42, Sep. 2017, doi: 10.1016/j.compgeo.2017.04.006.
  11. H. Gholami and E. S. Hosseininia, “Bearing Capacity Factors of Ring Footings by Using the Method of Characteristics,” Geotechnical and Geological Engineering, vol. 35, no. 5, pp. 2137–2146, Oct. 2017, doi: 10.1007/s10706-017-0233-9.
  12. A. N. Kamble and S. S. Patil, “Analysis of Ring Foundation Using Finite Element Method for Various Depths,” International Journal of Innovative Research in Science, Engineering and Technology, vol. 6, Issue 2, Feb. 2017.
  13. J. T. Chavda and G. R. Dodagoudar, “Finite Element Evaluation of Vertical Bearing Capacity Factors Nc′, Nq′ and Nγ′ for Ring Footings,” Geotechnical and Geological Engineering, vol. 37, no. 2, pp. 741–754, Apr. 2019, doi: 10.1007/s10706-018-0645-1.
  14. R. Vali, M. Beygi, M. Saberian, and J. Li, “Bearing capacity of ring foundation due to various loading positions by finite element limit analysis,” Comput Geotech, vol. 110, pp. 94–113, Jun. 2019, doi: 10.1016/j.compgeo.2019.02.020.
  15. N. Hataf and A. Fatolahzadeh, “An Experimental and Numerical Study on the Bearing Capacity of Circular and Ring Footings on Rehabilitated Sand Slopes with Geogrid,” Journal of Rehabilitation in Civil Engineering, vol. 7, no. 1, pp. 174–185, Feb. 2019, doi: 10.22075/JRCE.2018.11576.1193.
  16. A. A. Al-Azzawi and K. A. Daud, “Numerical analysis of thin ring foundations under different loading conditions,” in IOP Conference Series: Materials Science and Engineering, Institute of Physics Publishing, Aug. 2019. doi: 10.1088/1757-899X/584/1/012050.
  17. J. T. Chavda and G. R. Dodagoudar, “On vertical bearing capacity of ring footings: finite element analysis, observations and recommendations,” International Journal of Geotechnical Engineering, vol. 15, no. 10, pp. 1207–1219, 2021, doi: 10.1080/19386362.2019.1648737.
  18. K. Birid and D. Choudhury, “Undrained Bearing Capacity Factor Nc for Ring Foundations in Cohesive Soil,” International Journal of Geomechanics, vol. 21, no. 2, Feb. 2021, doi: 10.1061/(asce)gm.1943-5622.0001900.
  19. M. Hussein, “NUMERICAL ANALYSIS OF RING FOOTINGS RESTING ON SAND BEDS,” Sohag Engineering Journal, vol. 1, no. 1, pp. 96–109, Mar. 2021, doi: 10.21608/sej.2021.155946.
  20. H. Hosamo, I. Sliteen, and S. Ding, “Numerical analysis of bearing capacity of a ring footing on geogrid reinforced sand,” Buildings, vol. 11, no. 2, pp. 1–12, Feb. 2021, doi: 10.3390/buildings11020068.
  21. K. Kumar, S. Metya, and G. Bhattacharya, “Numerical Analysis of Reinforced Ring Foundation Subjected to Eccentric-Inclined Loading,” 2022.
  22. A. H. Wang, Y. F. Zhang, F. Xia, R. P. Luo, and N. Wang, “Ultimate Bearing Capacity of Ring Foundations Embedded in Undrained Homogeneous Clay,” Geofluids, vol. 2022, 2022, doi: 10.1155/2022/6382799.
  23. S. H. Fartosy, F. W. Jawad, Z. A. Hacheem, and A. S. T. Al-Madhhachi, “EVALUATION BEARING CAPACITY OF RING FOOTINGS ON REINFORCED LOOSE SAND,” Journal of Applied Engineering Science, vol. 21, no. 1, pp. 29–35, 2023, doi: 10.5937/jaes0-37350.
  24. B. A. Ahmed, H. M. Saleh, M. M. Jameel, and A. Al-Taie, “Increasing the Performance of Ring Foundation to Lateral Loads by using a Skirt Foundation,” Engineering, Technology and Applied Science Research, vol. 14, no. 6, pp. 17629–17635, Dec. 2024, doi: 10.48084/etasr.8617.
  25. J. Zhang et al., “Research on Anchorage Performance of the Foundation Ring for Wind Turbines,” Materials, vol. 17, no. 8, Apr. 2024, doi: 10.3390/ma17081716.
  26. P. Goel and K. Chatterjee, “Settlement Prediction of Ring Foundation under Seismic Conditions,” Japanese Geotechnical Society Special Publication, vol. 10, no. 60, pp. 2448–2452, 2024, doi: 10.3208/jgssp.v10.p2-19.
  27. H. A. Ghanim, S. F. A. Al-Wakel, and Z. W. Samueel, “Experimental Study of the Effect of Relative Density on the Behavior of Ring Footing on a Slope,” in IOP Conference Series: Earth and Environmental Science, Institute of Physics, 2025. doi: 10.1088/1755-1315/1507/1/012066.