Experimental and Numerical Study of Load-Bearing and Settlement Behavior of Circular Skirted foundations Compared to other Types of Foundations

مهندسی عمران فردوسی

Article 6, Volume 33, Issue 3 - Serial Number 31, October 2020, Pages 85-104   

Document Type: پژوهشی

DOI: 10.22067/jfcei.2021.61489.0

Authors

Sajjad Gholipour^* ; sajjad gholipour

Civil Engineering Department, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran.

Abstract

Skirted foundations are expanding as a new type of alternative foundations for other prevalent foundations in onshore and offshore structures. The study of skirted foundations performance is essential for evaluating the effect of foundation geometry and soil specification. In this research, the bearing capacity and settlement of circular skirted foundations resting on sand under vertical compression loading was studied by physical modeling and numerical analysiswith consideration of the effect of different parameters including skirt depth, foundation diameter, sand density and surface roughness of the foundation models. The performance of skirted foundations was compared with common types of surface, semi-deep and embedded foundations. Analysis of results showed that the behavior of skirted foundation models compared to the surface foundations has been improved significantly in terms of the enhancement in the values of bearing capacity and subgrade reaction modulus, as well as the reduction of settlement amounts. Improvement in the performance of skirted foundations was increased by increasing the skirt depth and surface roughness of models, and also, reducing the density of the sand. The comparison of the bearing capacity results of the skirted foundations with the corresponding values of the semi-deep foundations showed that the load- bearing behavior of the skirted foundations is close to those of semi-deep foundations with the same depth and diameter. Comparison of the skirted foundations performance relative to embedded surface foundations represents a further reduction in the settlement amounts of surface foundations due to the skirt existence underneath foundation instead of its embedment in depth, as well as the further improvement of bearing capacity by increasing the surface roughness of the skirt.

Keywords

Skirted foundation; Physical modelling; Bearing capacity; Semi-deep foundation

Supplementary Files

6-makarchian-Revised-2.pdf

References

1. Binquet, J., and Lee, K. L., "Bearing Capacity Aanalysis of Reinforced Earth Slabs", Journal of Geotechnical and Geoenvironmental Engineering, Vol. 101, Pp. 201–224, (1975).
2. Consoli, N.C., Prietto, P.D., and Ulbrich, L.A., "Influence of Fiber and Cement Addition on Behavior of Sandy Soil", Journal of Geotechnical and Geoenvironmental Engineering, Vol. 124, No. 12, Pp. 1211-1214, (1998).
3. Dash, S., Rajagopal, K., and Krishnaswamy, N., "Performance of Different Geosynthetic Reinforcement Materials in Sand Foundations", Geosynthetics International, Vol. 11, No. 1, Pp. 35-42, (2004).
4. Mayne, P.W., Jones, J.S., and Dumas, J.C., "Ground Response to Dynamic Compaction", Journal of Geotechnical Engineering, Vol. 110, No. 6, Pp. 757-774, (1984).
5. Zadroga, B., "Bearing Capacity of Shallow Foundations on Noncohesive Soils", Journal of Geotechnical Engineering, Vol. 120, No. 11, Pp. 1991-2008, (1994).
6. Eslami, A., and Fellenius, B.H., "Pile Capacity by Direct CPT and CPTu Methods Applied to 102 Case Histories", Canadian Geotechnical Journal, Vol. 34, No. 6, Pp. 886-904, (1997).
7. Eslami, A., Valikhah, F., Veiskarami, M., and Salehi, M., "CPT-Based Investigation for Pile Toe and Shaft Resistances Distribution", Geotechnical and Geological Engineering, Vol. 35, No. 6, Pp. 2891-2905, (2017).
8. Meyerhof, G. G., "Some Recent Research on the Bearing Capacity of Foundations", Canadian Geotechnical Journal, Vol. 1, No. 1, Pp. 16-26, (1963).
9. Vesic, A. B., "Bearing Capacity of Deep Foundations in Sand", Highway Research Record, Vol. 39, Pp. 112-53, (1963).
10. Gourvenec, S., and Randolph, M. F., "Consolidation Beneath Circular Skirted Foundations", International Journal of Geomechanics, Vol. 10, No. 1, Pp. 22-29, (2010).
11. Rezazadeh, S., and Eslami, A., "Bearing Capacity of Semi-deep Skirted Foundations on Clay Using Stress Characteristics and Finite Element Analyses", Marine Georesources & Geotechnology, Vol. 36, No. 6, Pp. 625-639, (2018).
12. Esmaeili, K., Eslami, A., and Rezazadeh, S., "Semi-deep Skirted Foundations and Numerical Solution to Evaluate Bearing Capacity", Open Journal of Geology, Vol. 8, Pp. 623-640, (2018).
13. Yun, G., and Bransby, M., "The Undrained Vertical Bearing Capacity of Skirted Foundations", Soils and Foundations, Vol. 47, No. 3, Pp. 493-505, (2007).
14. Al-Aghbari, M., and Dutta, R., "Performance of Square Footing with Structural Skirt Resting on Sand", Geomechanics and Geoengineering: An International Journal, Vol. 3, No. 4, Pp. 271-277, (2008).
15. Al-Aghbari, M., and Mohamedzein, Y. E., "Bearing Capacity of Strip Foundations with Structural Skirts", Geotechnical & Geological Engineering, Vol. 22, No. 1, Pp. 43–57, (2004).
16. Al-Aghbari, M., and Mohamedzein, Y. E., "Improving the Performance of Circular Foundations Using Structural Skirts", Proceedings of the Institution of Civil Engineers-Ground Improvement, Vol. 10, No. 3, Pp. 125-132, (2006).
17. Villalobos, F., "Bearing Capacity of Skirted Foundations in Sand", in: VI Congreso Chileno de Geotecnia, SOCHIGE,Valparaiso, Pp. 1-14, (2007) .
18. El Sawwaf, M., and Nazer, A., "Behavior of Circular Footings Resting on Confined Granular Soil", Journal of Geotechnical and Geoenvironmental Engineering, Vol. 131, No. 3, Pp. 359-366, (2005).
19. Golmoghani-Ebrahimi, S., and Rowshanzamir, M., "Experimental Evaluation of Bearing Capacity of Skirted Footings", Civil Engineering and Architecture, Vol. 1, No. 4, Pp. 103-108, (2013).
20. Elsaied, A.E., Saleh, N. M., and Elmashad, M.E., "Behavior of Circular Footing Resting on Laterally Confined Granular Reinforced Soil", HBRC Journal, Vol. 11, No. 2, Pp. 240-245, (2015).
21. Eid, H. T., "Bearing Capacity and Settlement of Skirted Shallow Foundations on Sand", International Journal of Geomechanics, Vol. 13, No. 5, Pp. 645-652, (2012).
22. Eid, H. T., Alansari, O. A., Odeh, A. M., Nasr, M. N., and Sadek, H.A., "Comparative Study on the Behavior of Square Foundations Resting on Confined Sand", Canadian Geotechnical Journal, Vol. 46, No. 4, Pp. 438-453, (2009).
23. Gholipour, S., and Makarchian, M., "Study of the Behaviour of Skirted Shallow Foundations Resting on Sand", International Journal of Physical Modelling in Geotechnics, Vol. 18, No. 3, Pp. 117-130, (2018).
24. Azzam, W., and Farouk, A., "Experimental and Numerical Studies of Sand Slopes Loaded with Skirted Strip Footing", Electronic Journal of Geotechnical Engineering, Vol. 15, No. 1, Pp. 795-812, (2010).
25. Bransby, M., and Yun, G. J., "The Undrained Capacity of Skirted Strip Foundations under Combined Loading", Géotechnique, Vol. 59, No. 2, Pp. 115-125, (2009).
26. Mana, D. S.,  Gourvenec, S., and Martin, C. M., "Critical Skirt Spacing for Shallow Foundations under General Loading", Journal of Geotechnical and Geoenvironmental Engineering, Vol. 139, No. 9, Pp. 1554-1566, (2009).
27. Das, B. M., "Principles of Foundation Engineering", 6th Edition, Thomson, Canada, 445P. (2007).
28. Dean, E. T. R., "Offshore Geotechnical Engineering: Principles and Practice", Published by Thomas Telford Limited, London, UK, (2010).
29. Cerato, A., and Lutenegger, A., "Bearing Capacity of Square and Circular Footings on a Finite Layer of Granular Soil Underlain by a Rigid Base", Journal of Geotechnical and Geoenvironmental Engineering, Vol. 132, No. 11, Pp. 1496-1501, (2006).
30. Pfeifle, T. W., and Das, B. M., "Model Tests for Bearing Capacity in Sand", Journal of Geotechnical and Geoenvironmental Engineering, Vol. 105, Pp. 1112-1116, (1979).
31. Chen, Q., "An Experimental Study on Characteristics and Behavior of Reinforced Soil Foundation", PHD Thesis, Louisiana State University, (2007).
32. ASTM Standard, D2487, "Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System)", ASTM International, West Conshohocken, PA, (2006).
33. Butterfield, R., and Andrawes, K., "An Air Activated Sand Spreader for Forming Uniform Sand Beds", Geotechnique, Vol. 20, No. 1, Pp. 97-100, (1970).
34. Rad, N. S., and Tumay, M. T., "Factors Affecting Sand Specimen Preparation by Raining", Geotechnical Testing Journal, Vol. 10, No. 1, Pp. 31-37, (1987).
35. Walker, B., and Whitaker, T., "An Apparatus for Forming Uniform Beds of Sand for Model Foundation Tests", Geotechnique, Vol. 17, No. 2, Pp. 161-167, (1987).
36. Fellenius, B. H., "The Analysis of Results from Routine Pile Load Tests", Ground Engineering, Vol. 13, No. 6, Pp. 19-31, (1980).
37. Winterkorn, H. F., and Fang, H. Y., "Foundation Engineering Handbook", New York Van Nostrand Reinhold, Edition 1, Chapter 3, Pp. 121-147, (1975).
38. Terzaghi, K., "Theoretical Soil Mechanics", John Wiley & Sons, New York, 510P., (1943).
39. Hansen, J. B., "A Revised and Extended Formula for Bearing Capacity", Danish Geotechnical Institute, Bulletin No. 28, Copenhagen, pp. 5–11, (1970).
40. Janbu, N., "Static Bearing Capacity of Friction Piles", in: 6th European Conference on SMFE, Vol.. 1.2, Pp. 479-88, (1976).
41. Poulos, H. G., and Davis, E. H., "Elastic Solutions for Soil and Rock Mechanics", John Wiley & Sons, New York, 411P., (1974).
42. Fox, L., "The Mean Elastic Settlement of a Uniformly Loaded Area at a Depth Below the Ground Surface", in: Proceedings of 2nd International Conference on Soil Mechanics and Foundation Engineering,Vol.1, Pp. 129-132, (1948).
43. Nishida, Y., "Vertical Stress and Vertical Deformation of Ground under a Deep Circular Uniform Pressure in the Semi-infinite", in: 1st ISRM Congress, (1966).