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Purpose: The paper presents an experimental and numerical study to evaluate the bearing capacity of unskirted, singly and doubly skirted irregular pentagonal footings on different sands (S1, S2, S3) at a relative density of 30 %. The skirt depth of the footing was varied from 0.0B to 1.5B (B is the width of the square footing). Design/methodology/approach: The experimental and numerical study of the singly and doubly skirted irregular pentagonal footing resting on sands was modelled in a test tank and Plaxis 3D software respectively. Findings: The results of this study reveal that the bearing capacity was higher for the skirted irregular pentagonal footings on sand S3 followed by sand S2 and S1. The lowest percentage improvement for the singly skirted footing on sand S3 was 18.51% at a Ds/B = 0.25 whereas the highest improvement was 90.81% at a Ds/B = 1.50 for the singly skirted footing on sand S2. The highest percentage improvement for the doubly skirted footing on sand S2 was 95.13% at a Ds/B = 1.5 whereas the lowest improvement was 23.70% at a Ds/B = 0.25 the doubly skirted footing on sand S3. The results further revealed that the numerically obtained bearing capacity was marginally higher in comparison to the one obtained experimentally for the footings on all sands. Further, the experimental results validated the results obtained numerically with an average deviation of 8%. The percentage improvement in the bearing capacity was higher for the irregular pentagonal footing resting on sand S2 in comparison to sand S3 and S1. The settlement response of the irregular pentagonal footings is unchanged by increasing the number of elements beyond 7700. Both the experimental and numerical studies revealed a linear elastic behaviour at Ds = 0.5B, while the experimentally obtained pressure-settlement ratio plot shows a clear failure at Ds= 1B and 1.5B. Research limitations/implications: The results presented in this paper were based on the experimental and numerical study conducted on small scale model footings. However, for the actual footings, further study is recommended using full-scale field size footings to generalize the results. Originality/value: No experimental and numerical studies on singly and doubly skirted irregular pentagonal footings were conducted so far. Hence, an attempt was made in this article to predict the bearing capacity of these footings experimentally and using Plaxis 3D respectively.
Wydawca
Rocznik
Tom
Strony
5--17
Opis fizyczny
Bibliogr. 33 poz., rys., tab., wykr.
Twórcy
autor
- Department of Civil Engineering, National Institute of Technology, Hamirpur, (H.P.), 177005, India
autor
- Department of Civil Engineering, National Institute of Technology, Hamirpur, (H.P.), 177005, India
Bibliografia
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- [3] M. Ghazavi, S. Mokhtari, Numerical investigation of load-settlement characteristics of multi-edge shallow foundations, Proceedings of the 12th International Conference of International Association for Computer Methods and Advances in Geomechanics, Goa, India, 2008, 3344-3351.
- [4] T. Gnananandarao, V.N. Khatri, R.K. Dutta, Performance of multi-edge skirted footings resting on sand, Indian Geotechnical Journal 48/3 (2018) 510-519. DOI: https://doi.org/10.1007/s40098-017-0270-6
- [5] M.Y. Al-Aghbari, Y.E.A. Mohamedzein, Bearing capacity of strip foundations with structural skirts, Geotechnical and Geological Engineering 22/1 (2004) 43-57. DOI: https://doi.org/10.1023/B:GEGE.0000013997.79473.e0
- [6] M.Y. Al-Aghbari, Y E A Mohamedzein, Al-N Hammad, Potential use of structural skirts towards improving the bearing capacity of shallow footings exposed to inclined loadings, International Journal of Geotechnical Engineering (2019) (published online). DOI: https://doi.org/10.1080/19386362.2019.1617477
- [7] V.N. Khatri, J. Kumar, Finite-element limit analysis of strip and circular skirted footings on sand, International Journal of Geomechanics 19/3 (2019) 06019001. DOI: https://doi.org/10.1061/(ASCE)GM.1943-5622.0001370
- [8] M.Y. Al-Aghbari, R.K. Dutta, Performance of square footing with structural skirt resting on sand, Geomechanics Geoengineering 3/4 (2008) 271-277. DOI: https://doi.org/10.1080/17486020802509393
- [9] H.T. Eid, O.A. Alansari, A.M. Odeh, M.N. Nasr, H.A. Sadek, Comparative study on the behaviour of square foundations resting on confined sand, Canadian Geotechnical Journal 46 (2009) 438-453. DOI: https://doi.org/10.1139/T08-134
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- [12] V.N. Khatri, S.P. Debbarma, R.K. Dutta, B. Mohanty, Pressure-settlement behaviour of square and rectangular skirted footings resting on sand, Geomechanics and Engineering 12/4 (2017) 689-705. DOI: https://doi.org/10.12989/gae.2017.12.4.689
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- [17] A.Z. El Wakil, Horizontal capacity of skirted circular shallow footings on sand, Alexandria Engineering Journal 49/4 (2010) 379-385. DOI: https://doi.org/10.1016/j.aej.2010.07.003
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- [19] A.E. El-Saied, N.M. Saleh, M.E. El-Mashad, Behavior of circular footing resting on laterally confined granular reinforced soil, HBRC Journal 11/2 (2015) 240-245. DOI: https://doi.org/10.1016/j.hbrcj.2014.03.011
- [20] G. Sajjad, M. Masoud, Study of the behaviour of skirted shallow foundations resting on sand, International Journal of Physical Modelling in Geotechnics 18/3 (2018) 117-130. DOI: https://doi.org/10.1680/jphmg.16.00079
- [21] S. Rezazadeh, A. Eslami, Bearing capacity of semi-deep skirted foundations on clay using stress characteristics and finite element analyses. Marine Georesources & Geotechnology 36/6 (2018) 625-639. DOI: https://doi.org/10.1080/1064119X.2017.1361488
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- [25] S. Alzabeebee, Dynamic response and design of a skirted strip foundation subjected to vertical vibration. Geomechanics and Engineering 20/4 (2020) 345-358. DOI: http://dx.doi.org/10.12989/gae.2020.20.4.345
- [26] B. Bienen, C. Gaudin, M.J. Cassidy, L. Rausch, O.A. Purwana, H. Krisdani, Numerical modelling of a hybrid skirted foundation under combined loading, Computers and Geotechnics 45 (2012) 127-139. DOI: https://doi.org/10.1016/j.compgeo.2012.05.009
- [27] T. Gnananandarao, R.K. Dutta, V.N. Khatri, Model studies of plus and double box shaped skirted footings resting on sand, International Journal of Geoengineering 11/1 (2020) 2. DOI: https://doi.org/10.1186/s40703-020-00109-0
- [28] A. Thakur, R.K. Dutta, A study on bearing capacity of skirted square footings on different sands, Indian Geotechnical Journal 50/6 (2020) 1057-1073. DOI: https://doi.org/10.1007/s40098-020-00440-4
- [29] A. Thakur, R.K. Dutta, Experimental and numerical studies of skirted hexagonal footings on three sands, SN Applied Sciences 2/3 (2020) 487. DOI: https://doi.org/10.1007/s42452-020-2239-9
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- [31] IS 2720, Part III, Determination of Specific gravity. Indian Standard methods of test for soils, Bureau of Indian Standards, New Delhi, 1980.
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Uwagi
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Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-2b5e92f7-43b3-4eaf-8c4c-b2b7ec53f2df