Temassız Kazıklı Radye Temellerde Geohücre ile Güçlendirilmiş Yastıkların Yük Dağılımı ve Oturmanın Azaltılmasına Etkisinin Nümerik Olarak İncelenmesi

Year 2024, , 11 - 27, 29.02.2024

Mojtaba Pourgholamali , Farzin Asgharpour

https://doi.org/10.62520/fujece.1399814

Abstract

Temassız kazıklı radye temellerde geohücre ile güçlendirilmiş yastıkların yük dağılımına ve oturmaların azaltılmasına etkisi araştırılmıştır. Abaqus yazılımı kullanılarak çeşitli durumların modellemesi ve analizi gerçekleştirilmiştir. Bu çalışmada bir temaslı, üç temassız ve takviyesiz, beş temassız ve geohücre ile güçlendirilmiş durumlar olmak üzere toplamda dokuz model incelenmiştir. Kalınlıkları temel kalınlığının yarısı, eşit ve temel kalınlığının iki katı kadar olan yastık modelleri kullanılmıştır. Sonuçlar, yük dağıtım verimliliği ve oturmanın en aza indirilmesi açısından en iyi sonuçların, yastığın rijitliği temelin rijitliğinin yarısı kadar olduğu modellerde elde edildiğini göstermiştir. Elde edilen sonuçlar, temassız kazıklı radye temellerin performansını arttırma noktasında geohücre takviyesinin olumlu etkisini göstermektedir. Geohücrenin modellere eklenmesi zeminin rijitliğini ve kazık yük oranının artmasını sağlamakta ve dolayısıyla güçlendirilmemiş modellere kıyasla kazıklı radye temelin yük taşıma kapasitesini arttırmaktadır. Çalışmanın bulguları, geohücrelerin inşaat mühendisliği uygulamalarında özellikle yüksek yük taşıma kapasitesi ve minimum temel oturmasını gerektiren durumlarda daha etkin bir şekilde kullanılması için uygun zemini hazırlamaktadır.

Keywords

Kazıklar, radye, yastık, temassız kazıklı temeller

Numerical Investigation of the Effect of Geocell-Reinforced Cushion on Load Distribution and Settlement Reduction in Unconnected Piled Raft Foundations

Abstract

The effect of geocell-reinforced cushion on load distribution and settlement reduction in unconnected piled raft foundations was investigated. Modeling and analysis of various scenarios were carried out using Abaqus software. In this research, a total of nine models, including one connected, three unconnected and unreinforced, and five unconnected and reinforced with geocell, were analyzed. Cushions with thicknesses half of, equal to, and twice that of the foundation were used. The results have shown that optimal outcomes in terms of load distribution efficiency and settlement reduction are achieved when the cushion's stiffness is set at half that of the foundation. The obtained results demonstrate the positive effect of geocell reinforcement in enhancing the performance of unconnected piled raft foundations. The introduction of geocells into the models increases soil stiffness and pile load ratio, consequently enhancing the load-bearing capacity of the piled raft foundation compared to the unreinforced models. The study's findings pave the way for a more effective use of geocells in civil engineering applications, particularly in scenarios demanding high load-bearing capacity and minimal foundation settlement.

Keywords

Piles, raft, cushion, unconnected piles raft

References

• A. Ata, E. Badrawi and M. Nabil, “Numerical analysis of unconnected piled raft with cushion,” Ain Shams Engineering Journal, vol. 6, no. 2, pp. 421–428, Jun. 2015.
• M. M. Biabani, N. T. Ngo and B. Indraratna, “Performance evaluation of railway subballast stabilised with geocell based on pull-out testing,” Geotextiles and Geomembranes, vol. 44, no. 4, pp. 579–591, Aug. 2016.
• B. Das, R. Saha and S. Haldar, “Effect of in-situ variability of soil on seismic design of piled raft supported structure incorporating dynamic soil-structure-interaction,” Soil Dynamics and Earthquake Engineering, vol. 84, pp. 251–268, May 2016.
• P. Deb and S. K. Pal, “Numerical analysis of piled raft foundation under combined vertical and lateral loading,” Ocean Engineering, vol. 190, p. 106431, Oct. 2019.
• A. M. J. Alhassani and A. N. Aljorany, “Parametric Study on Unconnected Piled Raft Foundation Using Numerical Modelling,” Journal of Engineering, vol. 26, no. 5, pp. 156–171, May 2020.
• W. El Kamash, H. El Naggar, M. Nabil, and A. Ata, “Optimizing the Unconnected Piled Raft Foundation for Soft Clay Soils: Numerical Study,” KSCE Journal of Civil Engineering, vol. 24, no. 4, pp. 1095–1102, Apr. 2020.
• X. D. Cao, I. H. Wong, and M.-F. Chang, “Behavior of Model Rafts Resting on Pile-Reinforced Sand,” Journal of Geotechnical and Geoenvironmental Engineering, vol. 130, no. 2, pp. 129–138, Feb. 2004.
• A. Z. Elwakil and W. R. Azzam, “Experimental and numerical study of piled raft system,” Alexandria Engineering Journal, vol. 55, no. 1, pp. 547–560, Mar. 2016.
• J. Han, X. M. Yang, D. Leshchinsky, R. L. Parsons, and A. Rosen, “Numerical Analysis for Mechanisms of a Geocell-Reinforced Base Under a Vertical Load,” in Geosynthetics in Civil and Environmental Engineering, Berlin, Heidelberg: Springer Berlin Heidelberg, pp. 741–746.
• X. Han, Y. Li, J. Ji, J. Ying, W. Li, and B. Dai, “Numerical simulation on the seismic absorption effect of the cushion in rigid-pile composite foundation,” Earthquake Engineering and Engineering Vibration, vol. 15, no. 2, pp. 369–378, Jun. 2016.
• A. Hegde, “Geocell reinforced foundation beds-past findings, present trends and future prospects: A state-of-the-art review,” Constr Build Mater, vol. 154, pp. 658–674, Nov. 2017.
• H. Bolouri Bazaz, A. Akhtarpour, and A. Karamodin, “A study on the effects of piled-raft foundations on the seismic response of a high rise building resting on clayey soil,” Soil Dynamics and Earthquake Engineering, vol. 145, p. 106712, Jun. 2021.
• H.-J. Park et al., “Centrifuge modeling of disconnected piled raft using vertical pushover tests,” Acta Geotech, vol. 15, no. 9, pp. 2637–2648, Sep. 2020.
• A. Hegde and T. G. Sitharam, “3-Dimensional numerical modelling of geocell reinforced sand beds,” Geotextiles and Geomembranes, vol. 43, no. 2, pp. 171–181, Apr. 2015.
• A. Kumar, D. Choudhury, and R. Katzenbach, “Effect of Earthquake on Combined Pile–Raft Foundation,” International Journal of Geomechanics, vol. 16, no. 5, Oct. 2016.
• B. Leshchinsky and H. I. Ling, “Numerical modeling of behavior of railway ballasted structure with geocell confinement,” Geotextiles and Geomembranes, vol. 36, pp. 33–43, Feb. 2013.
• F. Y. Liang, L. Z. Chen, and X. G. Shi, “Numerical analysis of composite piled raft with cushion subjected to vertical load,” Comput Geotech, vol. 30, no. 6, pp. 443–453, Sep. 2003.
• H. Pincus, R. Bathurst, and R. Karpurapu, “Large-Scale Triaxial Compression Testing of Geocell-Reinforced Granular Soils,” Geotechnical Testing Journal, vol. 16, no. 3, p. 296, 1993.
• S. K. Pokharel, J. Han, D. Leshchinsky, and R. L. Parsons, “Experimental evaluation of geocell-reinforced bases under repeated loading,” International Journal of Pavement Research and Technology, vol. 11, no. 2, pp. 114–127, Mar. 2018.
• M. Saadatinezhad, A. Lakirouhani, and S. Jabini Asli, “Seismic response of non-connected piled raft foundations,” International Journal of Geotechnical Engineering, vol. 15, no. 1, pp. 66–80, Jan. 2021.
• S. R. Satyal, B. Leshchinsky, J. Han, and M. Neupane, “Use of cellular confinement for improved railway performance on soft subgrades,” Geotextiles and Geomembranes, vol. 46, no. 2, pp. 190–205, Apr. 2018.
• Simulia, CAE. 2014.
• J. K. Thakur, J. Han, and R. L. Parsons, “Factors Influencing Deformations of Geocell-Reinforced Recycled Asphalt Pavement Bases under Cyclic Loading,” Journal of Materials in Civil Engineering, vol. 29, no. 3, Mar. 2017.
• F. Tradigo, F. Pisanò, C. di Prisco, and A. Mussi, “Non-linear soil–structure interaction in disconnected piled raft foundations,” Comput Geotech, vol. 63, pp. 121–134, Jan. 2015.
• I. H. Wong, M. F. Chang, and X. D. Cao, “17. Raft foundations with disconnected settlement-reducing piles,” in Design applications of raft foundations, Thomas Telford Publishing, 2000, pp. 469–486.
• L. Zhang, S. H. Goh, and H. Liu, “Seismic response of pile-raft-clay system subjected to a long-duration earthquake: centrifuge test and finite element analysis,” Soil Dynamics and Earthquake Engineering, vol. 92, pp. 488–502.