Numerical Modeling and Parametric Study of Piled Rafts Foundations Using Finite Element Software PLAXİS 2D

Yıl 2024, Cilt: 8 Sayı: 1, 14 - 22, 31.03.2024

Hossein Zoriyeh Aligholi

Öz

This study presents a series of 2D analyses of piled rafts by varying the length, spacing, and diameter of the piles in the group. The simulated piled rafts are square in plan, and they are loaded vertically with a uniform load. The soil profile utilized for analysis represents the Avcılar district of Istanbul. The soil is treated as elasto-plastic material and idealized using the Mohr-Coulomb model in a drained condition, whereas the piles are modeled as embedded volume elements. For optimization purposes, a total of 64 different designs were created by varying pile diameter, pile length, and pile spacing as variables in pile raft foundation systems. To investigate how each variable affects deformation, modeling was carried out for pile diameters of 0.8, 1, 1.2, and 1.6 m and lengths of 15, 20, 25, and 30 m using 2D, 2.5D, 3D, and 4D ranges. As a result, the design with "D=0.8m, L=30, S/D=4" was found to be the optimal choice in terms of both price and performance.

Anahtar Kelimeler

Deep foundation, Piled raft foundation, Optimization, Plaxis 2D

Kaynakça

• [1] D. M. M. Reddy, S.V. Krishna, B. R. Jayalekshmi, "A Study on the Behavior of Piled Raft Foundation Under Seismic Loading," in In International Conference on Advances in Structural Mechanics and Applications, 2021.
• [2] I. Jamil, I. Ahmad, S. Ali Khan, W. Ullah, M. Amjad, B. Jehan Khan, H. Nasir, "Analysis and design of piled raft foundation taking into account interaction factors," Advances in Civil Engineering, 2022.
• [3] T. V. Reshma, B. S. Bhavya, S. S. Rashmi Mishra, "Behavior of Piles with Raft Foundation using Safe Software.," Int. J. Innov. Technol. Explor. Eng, vol. 8, no. 11, pp. 1432-1436, 2019.
• [4] A. Sinha, A.M. Hanna, "3D Numerical Model for Piled Raft Foundation," International Journal of Geomechanics, vol. 17, no. 2, 2017.
• [5] Y.F. Leung, A. Klar, K. Soga, "Theoretical Study on Pile Length Optimization of Pile Groups and Piled Rafts," Journal of Geotechnical and Geoenvironmental Engineering, 2010.
• [6] P. S. Wulandari, D. Tjandra, "Analysis of piled raft foundation on soft soil using PLAXIS 2D," Procedia Engineering, vol. 125, pp. 363-367, 2015.
• [7] J. Lee, Y.Kim, S. Jeong, "Three-dimensional analysis of bearing behavior of piled raft on soft clay," Computers and Geotechnics, vol. 37, no. 2, pp. 103-114, 2010.
• [8] A. Z. Elwakil, W.R. Azzam, "Experimental and numerical study of piled raft system," Alexandria Engineering Journal, vol. 55, no. 1, pp. 547-560, 2016.
• [9] D. Ahmed, S. N. L. Taib, T. Ayadat, A. Hasan, "Numerical analysis of the carrying capacity of a piled raft foundation in soft clayey soils," Civil Engineering Journal, vol. 8, no. 4, 2022.
• [10] M. R. Hakro, Z. Almani, M. Ali, F. Aslam, R. Fediuk, S. Klyuev, L. Sabitov, "Numerical Analysis of Piled-Raft Foundations on Multi-Layer Soil Considering Settlement and Swelling," Buildings, vol. 12, p. 356, 2022.
• [11] Tezcan, S. S., Kaya, E., Bal, I. E., & Özdemir, Z., "Seismic amplification at Avcılar, Istanbul," Engineering structures, vol. 24, no. 5, pp. 661-667, 2002.
• [12] Dalgiç, S., Turgut, M., Kuşku, İ., Coşkun, Ç., & Coşgun, T., "İstanbul’un Avrupa Yakasındaki Zemin ve Kaya Koşullarının Bina Temellerine Etkisi," Journal of Applied Earthsciences, vol. 8, no. 2, pp. 47-70, 2016.
• [13] Z. Ertürk, İstanbul Avrupa yakası güneyindeki zeminlerin geotekniği, (Doctoral dissertation, İstanbul Kültür Üniversitesi/Fen Bilimleri Enstitüsü/İnşaat Mühendisliği Anabilim Dalı/Geoteknik Bilim Dalı, 2015.
• [14] Chimdesa, F.F., Chimdesa, F.F., Jilo, N.Z. et al., "Numerical analysis of pile group, piled raft, and footing using finite element software PLAXIS 2D and GEO5.," Sci Rep, vol. 13, no. 1, p. 15875, 2023.
• [15] Ates, B. & Şadoğlu, E., "Experimental investigation of optimum piles spacing for piled raf foundation in sandy soils," Tek. Dergi, vol. 32, no. 13, 2021.
• [16] Chore, H., Ingle, R. & Sawant, V. A., "Non linear soil structure interaction of space frame-pile foundation-soil system," Struct. Eng. Mech, 2014.
• [17] T. Ç. v. Ş. B. Y. F. K. Başkanlığı, "İnşaat Birim Fiyatlarına Esas İşçilik-Araç ve Gereç," Ankara, Türkiye, 2023.