Numerical Study of Piled Raft Foundation in Non-Homogeneous Soil Using Finite Element Method
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Abstract
This paper analyzes a piled-raft foundation on non-homogeneous soils with variable layer depth percentages. The present work aims to perform a three-dimensional finite element analysis of a piled-raft foundation subjected to vertical load using the PLAXIS 3D software. Parametric analysis was carried out to determine the effect of soil type and initial layer thickness. The parametric study showed that increasing the relative density from 30 % to 80 % of the upper sand layer and the thickness of the first layer has led to an increase in the ultimate load and a decrease in the settlement of piled raft foundations for the cases of sand over weak soil. In clay over weak soil, the ultimate load of the piled raft foundation was increased, and the settlement decreased by increasing the clay cohesion of the upper layer from 20 kPa to 70 kPa. It was observed that the load shared by the raft was very effective when using dense sand in the upper layer. In the case of dense sand over stiff clay, the percent of load carried by the raft is (30-40) %. Although, for the case of stiff clay over soft clay, the load percentage was almost constant (16-20) %. While for other issues, the sharing load of raft foundation was close and had the same behavior, the load carried by raft is between (8-12) %.
Article received: 07/11/2022
Article accepted: 02/03/2023
Article published: 01/11/2023
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References
Abdel-Azim, O.A., Abdel-Rahman, K., and El-Mossallamy, Y.M., 2020. Numerical investigation of optimized piled raft foundation for high-rise building in Germany. Innovative Infrastructure Solutions, 5(1). Doi:10.1007/s41062-019-0258-4
Azizkandi, A.S., Habib Rasouli, H., and Baziar, M.H., 2018. Load sharing and carrying mechanism of piles in non-connected pile rafts using a numerical approach. International Journal of Civil Engineering, 17(6), pp. 793–808. Doi:10.1007/s40999-018-0356-2.
Banerjee, R., Bandyopadhyay, S., Sengupta, A., and Reddy, G.R., 2020. Settlement behaviour of a pile raft subjected to vertical loadings in multilayered soil. Geomechanics and Geoengineering, 17(1), pp. 282–296. Doi:10.1080/17486025.2020.1739754.
Basile, F., 2015. Non-linear analysis of vertically loaded piled rafts. Computers and Geotechnics, 63, pp. 73–82. Doi:10.1016/j.compgeo.2014.08.011.
Clancy, P., and Randolph, M.F., 1993. An approximate analysis procedure for piled raft foundations. International Journal for Numerical and Analytical Methods in Geomechanics, 17(12), pp. 849–869. Doi:10.1002/nag.1610171203.
Comodromos, E.M., Papadopoulou, M.C., and Rentzeperis, I.K., 2009. Pile foundation analysis and design using experimental data and 3-D numerical analysis. Computers and Geotechnics, 36(5), pp. 819–836. Doi:10.1016/j.compgeo.2009.01.011.
De Sanctis, L., and Mandolini, A., 2006. Bearing capacity of piled rafts on soft clay soils. Journal of Geotechnical and Geoenvironmental Engineering, 132(12), pp. 1600–1610. Doi:10.1061/(asce)1090-0241(2006)132:12(1600. .
Deb, P., and Pal., S.K., 2019. Analysis of Load Sharing Response and Prediction of Interaction Behaviour in Piled Raft Foundation. Arabian Journal for Science and Engineering, 44(10), pp. 8527–8543. Doi:10.1007/s13369-019-03936-1.
Deb, P., and Pal., S.K., 2019. Numerical analysis of piled raft foundation under combined vertical and lateral loading. Ocean Engineering, 190, P. 106431. Doi:10.1016/j.oceaneng.2019.106431.
Ferchat, A., Benmebarek, S., and Houhou, M.N., 2021. 3D numerical analysis of piled raft interaction in drained soft clay conditions. Arabian Journal of Geosciences, 14(5). Doi:10.1007/s12517-021-06783-3.
Halder, P., and Manna, B., 2020. Performance evaluation of piled rafts in sand based on load-sharing mechanism using finite element model. International Journal of Geotechnical Engineering, 16(5), pp. 574–591. Doi:10.1080/19386362.2020.1729297.
Hor, B., Song, M.J., Jung, M.H., Song, Y.H., and Park, Y.H., 2016. A 3D FEM analysis on the performance of disconnected piled raft foundation. Japanese Geotechnical Society Special Publication, 2(34), pp. 1238–1243. Doi:10.3208/jgssp.kor-21.
Huang, M., Liang, F., and Jiang, J., 2011. A simplified nonlinear analysis method for piled raft foundation in layered soils under vertical loading. Computers and Geotechnics, 38(7), pp. 875–882. Doi:10.1016/j.compgeo.2011.06.002.
Hussein, H.H., Karim, H.H., and Shlash, K.T., 2020. Analysis of piled raft foundation in sandy soil using full scale models. IOP Conference Series: Materials Science and Engineering, 737(1), P.012102. Doi:10.1088/1757-899x/737/1/012102.
Hussien, M.N., Ramadan, E.H., Hussein, M.H., Senoon, A.A.A., and Karray, M., 2016. Load sharing ratio of pile-raft system in loose sand: an experimental investigation. International Journal of Geotechnical Engineering, 11(5), pp. 524–529. Doi:10.1080/19386362.2016.1236224.
Kaavya, D., Divya Krishnan, K., and Ravichandran, P.T., 2020. Study of piled and disconnected piled raft system with raft foundation in cohesionless soil. IOP Conference Series: Materials Science and Engineering, 912, P.062061. Doi:10.1088/1757-899x/912/6/062061.
Karim, H.H., AL-Qaissy, M.R., and Hameedi, M.K., 2013. Numerical analysis of piled raft foundation on clayey soil. Maǧallaẗ al-handasaẗ wa-al-tiknūlūǧiyā, 31(7A), pp. 1297–1312. Doi:10.30684/etj.31.7a6.
Kaur, A., Singh, H., and Jha, J.N., 2021. Numerical study of laterally loaded piles in soft clay overlying dense sand. Civil Engineering Journal, 7(4), pp. 730–746. Doi:10.28991/cej-2021-03091686.
Kumar, A., Choudhury, D., and Katzenbach, R., 2016. Effect of earthquake on combined pile–raft foundation. International Journal of Geomechanics, 16(5). Doi:10.1061/(asce)gm.1943-5622.0000637.
Lee, J., Park, D.S., Park, D., and Park, K.B., 2015. Estimation of load-sharing ratios for piled rafts in sands that includes interaction effects. Computers and Geotechnics, 63, pp. 306–314. Doi:10.1016/j.compgeo.2014.10.014.
Mali, S., and Singh, B., 2018. Behavior of large piled-raft foundation on clay soil. Ocean Engineering, 149, pp. 205–216. Doi:10.1016/j.oceaneng.2017.12.029.
Nguyen, D.D.C., Jo, S.B., and Kim, D.S., 2013. Design method of piled-raft foundations under vertical load considering interaction effects. Computers and Geotechnics, 47, pp.16–27. Doi:10.1016/j.compgeo.2012.06.007.
Nguyen, N.V., Le Ba Vinh and Vo, T., 2021. Load-sharing mechanism of piled-raft foundation: a numerical study. European Journal of Environmental and Civil Engineering, 26(15), pp. 7916–7931. Doi:10.1080/19648189.2021.2013949.
Park, D.S., Park, D., and Lee, J.H., 2016. Analyzing load response and load sharing behavior of piled rafts installed with driven piles in sands. Computers and Geotechnics, 78, pp. 62–71. Doi:10.1016/j.compgeo.2016.05.008.
Patil, J.D., Vasanvala, S.A., and Solanki, C.H., 2015. An experimental study on behaviour of piled raft foundation. Indian Geotechnical Journal, 46(1), pp. 16–24. Doi:10.1007/s40098-015-0145-7.
Poulos, H.G., 2001. Piled raft foundations: design and applications. Géotechnique, 51(2), pp. 95–113. Doi:10.1680/geot.51.2.95.40292.
Poulos, H.G., Small, J.C., and Chow, H., 2011. Piled raft foundations for tall buildings. Geotechnical Engineering Journal of the Seags & Agssea, 42(2), pp. 78–84.
Prakoso, W.A., and Kulhawy, F.H., 2001. Contribution to piled raft foundation design. Journal of Geotechnical and Geoenvironmental Engineering, 127(1), pp. 17–24. Doi:10.1061/(asce)1090-0241(2001)127:1(17).
Ragheb, A.M., Abdelaziz, T.M., and Ayad, N.A., 2015. Load sharing of piled-raft foundations embedded in soft to medium clay subjected to vertical loads. International Journal of Scientific & Engineering Research, 6(10), pp. 989–1010.
Sinha, A., and Hanna, A.M., 2017. 3D numerical model for piled raft foundation. International Journal of Geomechanics, 17(2), P. 04016055. Doi:10.1061/(asce)gm.1943-5622.0000674.
Sönmez, N., 2013. A study on design of piled raft foundation systems, MSc. thesis, Middle East Technical University.
Sri, P.W., and Tjandra, D., 2015. Analysis of piled raft foundation on soft soil using PLAXIS 2D. Procedia Engineering, 125, pp. 363–367.
TA, L.D., and SMALL, J.C., 1996. Analysis of piled raft systems in layered soil. International Journal for Numerical and Analytical Methods in Geomechanics, 20(1), pp. 57–72. Doi:10.1002/(sici)1096-9853(199601)20:1%3C57::aid-nag807%3E3.0.co;2-0.
Tank, G.T., and Dave, S.P., 2011. Analytical approaches for analysis of piled-raft systems. International Journal of Advanced Engineering Technology, II(IV), pp. 431–434. Doi:10.30684/etj.35.2A.1.
Ukritchon, B., Faustino, J.C., and Keawsawasvong, S., 2016. Numerical investigations of pile load distribution in pile group foundation subjected to vertical load and large moment. Geomechanics and Engineering, 10(5), pp. 577–598. Doi:10.12989/gae.2016.10.5.577.
Vu, A., Pham, D., Nguyen, T., and He, Y., 2014. 3D finite element analysis on behaviour of piled raft foundations. Applied Mechanics and Materials, 3-8, pp. 580-583. Doi:10.4028/www.scientific.net/amm.580-583.3
Wulandari, P.S., and Tjandra, D., 2015. Analysis of piled raft foundation on soft soil using PLAXIS 2D. Procedia Engineering, 125, pp. 363–367. Doi:10.1016/j.proeng.2015.11.083.
Yamashita, K., Yamada, T., and Hamada, J., 2011. Investigation of settlement and load sharing on piled rafts by monitoring full-scale structures. Soils and Foundations, 51(3), pp. 513–532. Doi:10.3208/sandf.51.513.