An Analytical Study of Annular Raft on Granular Piles

• Autorzy: Rathor Ajay Pratap Singh , Sharma Jitendra Kumar , Madhira Madhav

Identyfikatory

DOI

10.2478/sgem-2024-0002

• Języki publikacji: EN

Abstrakty

EN

Rafts are frequently used to design foundations on soft soils to minimize the overall and differential settlements of structures built on them. In many cases, the raft alone can offer sufficient bearing capacity and all that is needed to restrict foundation settlements to a predetermined level with a few widely spaced piles. Granular piles (GPs) can be used due to their several advantages over steel or concrete piles. An annular raft foundation is generally provided for overhead water tanks, chimneys, etc. The provision of granular piles underneath the annular raft foundation not only increases the capacity of the foundation but also minimizes the settlement to an acceptable level. The present study deals with a rigorous analysis of annular raft foundation supported by GPs based on the continuum approach. A new numerical method is developed with geometric considerations for excluding the loaded pile portion from the region of the raft area by considering two distinct zones. This article introduces a novel approach, the annular raft over granular piles, which represents an innovative solution in geotechnical engineering. This innovation has the potential to improve the efficiency and effectiveness of foundation design in various construction projects. The response of annular raft foundation with GPs is evaluated in terms of settlement influence factor (SIF), load shared by granular piles (in %), and normalized shear stress variation along the GP–soil interface. The present study reveals that the presence of the pile influences the stress distribution locally. The stiffness of GP, relative length of GP, relative size of the raft influence the settlement and load sharing of annular raft with GPs.

Słowa kluczowe

EN

annular raft; granular pile; settlement influence factor; ring footing; shear stress

• Wydawca: De Gruyter
• Czasopismo: Studia Geotechnica et Mechanica
• Rocznik: 2024
• Tom: Vol. 46, nr 1
• Strony: 21--44
• Opis fizyczny: Bibliogr. 50 poz., rys., tab.

Twórcy

autor

Rathor Ajay Pratap Singh

• Civil Engineering Dept., Rajasthan Technical University, University Department, Kota-324010, India

autor

Sharma Jitendra Kumar

• Civil Engineering Dept., Rajasthan Technical University, University Department, Kota-324010, India

autor

Madhira Madhav

• Civil Engineering Dept., Jawaharlal Nehru Technological University & I.I.T. Hyderabad 500072, India

Bibliografia

• [1] Randolph, M. F., & Wroth, C. P. (1978). Analysis of deformation of vertically loaded piles. Journal of the geotechnical engineering division, 104(12), 1465-1488.
• [2] Poulos, H. G., & Davis, E. H. (1980). Pile foundation analysis and design (Vol. 397). New York: Wiley.
• [3] O’Neill, M. W., & Raines, R. D. (1991). Load transfer for pipe piles in highly pressured dense sand. Journal of Geotechnical Engineering, 117(8), 1208-1226.
• [4] Madhav, M.R. 1982. Recent developments in the analysis and design of granular piles. Symp. On Soil and Rock Improvement Tech. Bangkok, Thailand, Dec, 117-129.
• [5] Van Impe, W.F. and De Beer, E. 1983. Improvement of settlement behavior of soft layers by means of stone columns. Proc.7th ECSMFE, Helsinki, Vol. 1, pp. 1207-1210.
• [6] Madhav, M. R. and, Van Impe, W.F. 1994. Load transfer through a gravel bed on stone column reinforced soil. Geotechnical Engineering, Vol. 24, No.2, 47-62.
• [7] Madhav M. R. and Nagpure, D.D.1995. Granular piles- a low-cost alternative to R.C.C piles. Seminar on Ground Improvement Techniques, GRIMTECH, Indore, pp. 17-29.
• [8] Sharma, J.K. 1999. Analysis and settlement of granular pile(s) – single, in group and with raft. A Ph. D. Dissertation submitted to Department of Civil Engineering, Indian Institute of Technology, Kanpur.
• [9] Sharma, J.K. and Gupta, P. (2018) “Consideration of Nonlinear Non-homogeneity of Floating Granular Pile and Soil on Settlement”, Journal of The Institution of Engineers (India), 1-11, series A
• [10] Hasan, M., & Samadhiya, N. K. (2017). Performance of geosynthetic-reinforced granular piles in soft clays: model tests and numerical analysis. Computers and Geotechnics, 87, 178-187.
• [11] Hasan, M., & Samadhiya, N. K. (2022). Ground Improvement by Using Floating Granular Piles: Experimental Studies and Numerical Investigations. In Earthquake Geotechnics: Select Proceedings of 7th ICRAGEE 2021 (pp. 465-475). Springer Singapore.
• [12] Poulos, H.G., 2001. Piled raft foundations: design and applications. Geotechnique, 51(2), pp.95-113. doi:10.1680/ geot.51.2.95.40292.
• [13] Balaam, N.P., Poulos, H.G. and Brown, P.T. 1977. Settlement analysis of soft clays reinforced with granular piles. Proc.5th ARC, Bangkok, Thailand, Vol. 1, pp. 8192.
• [14] Madhav, M. R., Sharma, J. K. and Sivakumar, V. 2009. Settlement of and load distribution in a granular piled raft, Geomechanics and engineering Journal, Vol.1, (1), 97–112.
• [15] Kumar, A., D. Choudhury, and R. Katzenbach. 2016. “Effect of Earthquake on Combined Pile–raft Foundation.” International Journal of Geomechanics 16 (5): 04016013. doi:10.1061/(ASCE) GM.1943-5622.0000637.
• [16] Sinha, A., and A. Hanna. 2016. “3D Numerical Model for Piled Raft Foundation.” International Journal of Geomechanics 17 (2): 04016055. doi:10.1061/(ASCE)GM.1943-5622.0000674.
• [17] Samanta, M., & Bhowmik, R. (2017). 3D numerical analysis of piled raft foundation in stone column improved soft soil. International Journal of Geotechnical Engineering.
• [18] Deb, P., & Pal, S. K. (2022). Structural and geotechnical aspects of piled raft foundation through numerical analysis. Marine Georesources & Geotechnology, 40(7), 823-846.
• [19] Roy, J., A. Kumar, and D. Choudhury. 2018. “Natural Frequencies of Piled Raft Foundation Including Superstructure Effect.” Soil Dynamics and Earthquake Engineering 112: 69–75. doi:10.1016/j. soildyn.2018.04.048.
• [20] Roy, J., A. Kumar, and D. Choudhury. 2020. “Pseudostatic Approach to Analyze Combined Pile-raft Foundation.” International Journal of Geomechanics 20 (10): 06020028. doi:10.1061/(ASCE)GM.1943-5622.0001806.
• [21] Clancy P, Randolph MF (1993) An approximate analysis proce dure for piled raft foundations. Int J Numer Anal Meth Geomech 17(12):849-869. https://doi.org/10.1002/nag.1610171203
• [22] Bandyopadhyay, S., Sengupta, A., & Parulekar, Y. M. (2020). Behavior of a combined piled raft foundation in a multi-layered soil subjected to vertical loading. Geomech. Eng, 21(4), 379- 390.
• [23] Mandolini, A., Di Laora, R., & Mascarucci, Y. (2013). Rational design of piled raft. Procedia Engineering, 57, 45-52.
• [24] Solanki, A., Sharma, J. K., & Madhav, M. R. (2022). Interaction analysis of two floating granular piled raft units. Geomechanics and Geoengineering, 1-18.
• [25] Ornek, M., Laman, M., Demir, A. and Yildiz, A., 2012. Prediction of bearing capacity of circular footings on soft clay stabilized with granular soil. Soils and Foundations, 52(1), pp.69-80.
• [26] Sargazi, O. and Hosseininia, E.S., 2017. Bearing capacity of ring footings oncohesionless soil under eccentric load. Computers and Geotechnics, 92, pp.169-178.
• [27] Al-Azzawi, A.A. and Daud, K.A., 2019, August. Numerical analysis of thin ring foundations under different loading conditions. In IOP Conference Series: Materials Science and Engineering (Vol. 584, No. 1, p. 012050). IOP Publishing.
• [28] Xiao, Y., Zhao, M., Zhao, H. and Zhang, R., 2020. Numerical study on bearing capacity of ring foundations for storage tanks on a rock mass. Arabian Journal of Geosciences, 13(23), pp.1-9.
• [29] Prasad, S.D. and Chakraborty, M., 2021. Bearing capacity of ring footing resting on two layered soilsoils. Computers and Geotechnics, 134, p.104088.
• [30] Das, P.P., Khatri, V.N. and Dutta, R.K., 2021. Bearing capacity of ring footing on weak sand layer overlying a dense sand deposit. Geomechanics and Geoengineering, 16(4), pp.249- 262.
• [31] Birid, K. and Choudhury, D., 2021. Undrained bearing capacity factor Nc for ring foundations in cohesive soil. International Journal of Geomechanics, 21(2), p.06020038.
• [32] Birid, K. and Choudhury, D., 2021. Undrained bearing capacity factor Nc for ring foundations in cohesive soil. International Journal of Geomechanics, 21(2), p.06020038.
• [33] Yodsomjai, W., Keawsawasvong, S. and Lai, V.Q., 2021. Limit analysis solutions for bearing capacity of ring foundations on rocks using Hoek–Brown failure criterion. International Journal of Geosynthetics and Ground Engineering, 7(2), pp.1-10.
• [34] Birid, K. and Choudhury, D., 2022. Bearing capacity of ring foundations over a rock mass using numerical analysis. Geomechanics and Geoengineering, 17(6), pp.2013-2039.
• [35] Becker, D.E. and Lo, K.Y., 1979. Settlement and load transfer of ring foundation for tower silos. Canadian agricultural engineering, 21(2), pp.97-110.
• [36] Das, B. and Sivakugan, N., 2007. Settlements of shallow foundations on granular soil—an overview. International journal of geotechnical engineering, 1(1), pp.19-29.
• [37] Naseri, M. and Hosseininia, E.S., 2015. Elastic settlement of ring foundations. Soils and Foundations, 55(2), pp.284-295.
• [38] Lee, J.K. and Jeong, S., 2018. Immediate settlement of ring footings resting on inhomogeneous finite stratum. Applied Sciences, 8(2), p.255.
• [39] Taghavi Ghalesari, A. and Janalizadeh Choobbasti, A., 2018. Numerical analysis of settlement and bearing behaviour of piled raft in Babol clay. European Journal of Environmental and Civil Engineering, 22(8), pp.978-1003.
• [40] Shiuly, A. and Roy, S., 2021. Study on Settlement Behaviour of Annular Raft Foundation using Finite Element–Boundary Element Method. Iranian Journal of Science and Technology, Transactions of Civil Engineering, 45(3), pp.1705-1721.
• [41] Zhang, J. and Du, R., 2021, July. Study on calculation and analysis of foundation settlement in cooling tower. In IOP Conference Series: Earth and Environmental Science (Vol. 804, No. 2, p. 022009). IOP Publishing.
• [42] Rathor, A.P.S., Sharma, J.K., 2022. Numerical Evaluation of Settlement and Stresses of Annular Raft. J. Inst. Eng. India Ser. A (2022). doi:10.1007/s40030-022-00707-4
• [43] Sharma, J. K., & Sanadhya, R. R. (2022). Analysis of rigid raft overlying the granular pile with the effect of stiffness of bearing stratum. Geomechanics and Geoengineering, 17(1), 166-187.
• [44] Madhav, M. R., Sharma, J. K., & Chandra, S. (2006). Analysis and settlement of a non-homogeneous granular pile. Indian Geotechnical Journal, 36(3), 249-271.
• [45] Mindlin, R.D. 1936. Force at a point in the interior of a semi-infinite solid. Physics, 7, 195–202. doi:10.1063/1.1745385
• [46] Mindlin, R.D., 1937. Stress system in a circular disk under radial forces, presented at the joint meeting of applied mechanics and hydraulic division of the ASME held at Cornell University, NY, 115–118. 10.1115/1.4008786.
• [47] Boussinesq, J., 1885. Application of potentials to the study of the equilibrium and motion of elastic solids: mainly to the calculation of the strains and pressures produced, in these solids, by any forces exerted on a small part of their surface or of their interior: thesis followed by extensive notes on various points of physics, mathematics and analysis. Vol. 4. Gauthier-Villars, Paris, pp. 30.
• [48] Garg, V., & Sharma, J. K. (2020). Analyses and settlement study of a group of two, three and four partially stiffened floating granular piles. Geomechanics and Geoengineering, 15(3), 203-223.
• [49] Al-Sanad, H.A., Ismael, N.F. and Brenner, R.P., 1993. Settlement of circular and ring plates in very dense calcareous sands. Journal of geotechnical engineering, 119(4), pp.622-638.
• [50] Egorov, K.E. (1965). “Calculation of bed for foundation with ring footing.” Proc., 6th Int. Conf. Soil Mech. And Found. Engrg., Montreal, 2, 41-45.