Investigation of the effect of stone column design parameters on consolidation

Yıl 2023, Cilt: 12 Sayı: 1, 200 - 206, 15.01.2023

Firdevs Uysal Abdulazim Yıldız

https://doi.org/10.28948/ngumuh.1118184

Öz

The stone column is an effective ground improvement method that is used to increase the load-bearing capacity of soft soil and speed up the process of soft soil consolidation and decrease the settlement of soil. In this study, a series of numerical studies have been performed to evaluate the time-dependent behavior of stone column by using a validated numerical model and model parameters from a past laboratory study in literature. The soft soil reinforced with a stone column was modeled with Plaxis 2D using the unit cell concept. Parametric studies were conducted to understand the impact of stress concentration ratio, permeability ratio, and diameter ratio on the time-dependent settlement behavior of stone column. The numerical results indicate that these design parameters have a significant influence on the acceleration of the consolidation and increasing the average consolidation rate.

Anahtar Kelimeler

Stone column, Soft soil, Consolidation, Numerical modeling, Unit cell

Taş kolon tasarım parametrelerinin konsolidasyona etkisinin araştırılması

Öz

Taş kolon, yumuşak zeminin taşıma kapasitesini artırmak, yumuşak zemin konsolidasyonunu hızlandırmak ve zemin oturmasını azaltmak için kullanılan etkili bir zemin iyileştirme yöntemidir. Bu çalışmada, literatürde geçmiş bir laboratuvar çalışmasından alınan doğrulanmış bir sayısal model ve model parametreleri kullanılarak taş kolonun zamana bağlı davranışını değerlendirmek için bir dizi sayısal çalışma yapılmıştır. Taş kolon ile iyileştirilmiş yumuşak zemin birim hücre yaklaşımı kullanılarak Plaxis 2D ile modellenmiştir. Gerilme konsantrasyon oranı, permeabilite oranı ve çap oranının taş kolonun zamana bağlı oturma davranışı üzerindeki etkisini anlamak için parametrik çalışmalar yapılmıştır. Sayısal sonuçlar, bu tasarım parametrelerinin konsolidasyonun hızlanması ve ortalama konsolidasyon hızının artması üzerinde önemli bir etkiye sahip olduğunu göstermektedir.

Anahtar Kelimeler

Taş kolon, Yumuşak zemin, Sayısal modelleme, Birim hücre, konsolidasyon

Kaynakça

• S. Rajesh and P. Jain, Influence of permeability of soft clay on the efficiency of stone columns and geosynthetic-encased stone columns–a numerical study. International Journal of Geotechnical Engineering, 9 (5), 483-493, 2015. https://doi.org/10.1179/1939787914Y.0000000088.
• M. Ghazavi, A. E. Yamchi, and J. N. Afsar, Bearing capacity of horizontally layered geosynthetic reinforced stone columns. Geotextiles and Geomembranes. 46 (3), 312–318, 2018. https://doi.org/10.1016/j.geotexmem.2018.01.002.
• R. D Barksdale and R. C. Bachus, Design and construction of stone columns. Vol. I, FHWA/RD-83/026, Federal Highway Administration, Washington, D.C. 1983.
• A. Cimentada and A. Da Costa, Laboratory experimental analysis of radial consolidation around a stone column. In Geotechnics of soft soils: Focus on ground improvement, 213–217, London: Taylor and Francis, 2008.
• B. G. Sexton, B. A. Mccabe, M. Karstunen, and N. Sivasithamparam, Stone column settlement performance in structured anisotropic clays: The Influence of Creep. Journal of Rock Mechanics and Geotechnical Engineering, 8 (5), 672–688, 2016. https://doi.org/10.1016/j.jrmge.2016.05.004
• A. Hamzh, H. Mohamad and M. F. Bin Yusof, The effect of stone column geometry on soft soil bearing capacity. International Journal of Geotechnical Engineering, 16 (2), 200-210, 2019. https://doi.org/10.1080/19386362.2019.1666557
• K. S. Ng and S. A. Tan, Simplified homogenization method in stone column designs. Soils and Foundations, 55 (1), 154-165, 2015. https://doi.org/10.1016/j.sandf.2014.12.012
• F. Uysal, B. Bağrıaçık ve A. Yıldız, Yumuşak zemin model parametrelerinin zemin davranışına etkisi. Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi, 33 (1), 97-106, 2018. https://doi.org/10.21605/cukurovaummfd.420681
• A. Cimentada, A. Da Costa, J. Cañizal and C. Sagaseta, Laboratory study on radial consolidation and deformation in clay reinforced with stone columns. Canadian Geotechnical Journal, 48 (1), 36–52, 2011. https://doi.org/10.1139/T10-043
• W. Frikha, M. Bouassida, and J. Canou, Parametric study of a clayey specimen reinforced by a granular column. International Journal of Geomechanics, 15 (15), 2015. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000419
• J. W. Choi, D. Y. Lee, and C. S. Yoo, Undrained characteristics of geogrid-encased stone column under cyclic load using reduced-scale model tests. Journal of the Korean Geotechnical Society, 29 (1), 109-120. 2013. https://doi.org/10.7843/kgs.2013.29.1.109
• N. P. Balaam, J. R. Booker, Effect of stone column yield on settlement of rigid foundations in stabilized clay. International Journal for Numerical and Analytical Methods in Geomechanics, 9, John Wiley and Sons, Inc., 331-351. 1985.
• H. J. Priebe, Design of vibro replacement, the application of Priebe’s method to extremely soft soils ‘floating’ foundations and proof against slope or embankment failure. Ground Engineering, 38 (1) 2005.
• J. Castro and M. Karstunen, Numerical simulations of stone column installation. Canadian Geotechnical Journal, 47, 1127-1138. 2010. https://doi.org/10.1139/T10-019
• L. A. Dar and M. Y. Shah, Three dimensional numerical study on behavior of geosynthetic encased stone column placed in soft soil. Geotechical and Geological Engineering, 39, 1901–1922, 2021. https://doi.org/10.1007/s10706-020-01594-x
• M. Yıldız, Determination of stress concentration factor in stone columns by numerical modelling. Master Thesis, Middle East Technical University, Ankara, 2013.
• M. Killeen, Numerical modelling of small groups of stone columns. Ph.D. Thesis, National University of Ireland, Galway, 2012.
• B. S. Tan and S. Tjahyono, Practical modelling of stone-column reinforced ground. In Proceedings of the Korean Geotechical Society Conference, 291-311, Korean Geotechnical Society, 2006.
• K. Adalier and A. Elgamal, Mitigation of liquefaction and associated ground deformations by stone columns. Engineering Geology, 72 (3-4), 275-291, 2004. https://doi.org/10.1016/j.enggeo.2003.11.001
• P. Tai, B. Indraratna and C. Rujikiatkamjorn, Experimental simulation and mathematical modelling of clogging in stone column. Canadian Geotechnical Journal, 55 (3), 427-436, 2018. https://doi.org/10.1139/cgj-2017-0271