New Findings in Applied Geology

New Findings in Applied Geology

Numerical modeling of the effectiveness of some geogrid parameters in reducing the settlement of the foundation on granular soil

Authors
A. Jamshidi 1
R. Yazarloo 2
S. Aligholi 3
F. Nabizadeh 4
1 Assoc. Prof., Dept., of Geology, Faculty of Science, Lorestan University, Khorramabad, Iran
2 Assist. Prof., of Civil Engineering, Islamic Azad University, Gonbad Kavoos branch, Gonabad Kavoos, Iran
3 Dept., of Engineering Geology, Institute of Innovation, Science and Sustainability, Federation University, Ballarat 3350, VIC, Australia
4 Assist. Prof., of Civil Engineering, Islamic Azad University, Chaloos branch, Chaloos, Iran
10.22084/nfag.2024.29195.1610
Abstract
Reinforcement can significantly reduce foundation settlement, but finding an economic plan requires detailed numerical studies. In the present study, the stability of granular soil reinforced with geogrid was analyzed using PLAXIS software and the effect of factors such as the number and length of geogrid layers, the optimal depth of the first geogrid layer below the foundation, and the tensile strength of the geogrid on the of settlement were investigated. The results indicate that the factors mentioned above play a significant role in the foundation settlement. The analysis shows that by increasing the number and length of geogrid, the settlement value has decreased. Moreover, with the increase in the tensile strength of the geogrid, the settlement has significantly reduced. In regard the depth of the reinforced area, it was found that placing the first layer of geogrid after a certain depth (optimal depth) below the foundation does not cause a noticeable reduction in the settlement. Based on the output of PLAXIS software, the optimal values ​​of the number and length of geogrid layers, the optimal depth of the first geogrid layer below the foundation, and the tensile strength of the geogrid layer to minimizing the amount of settlement have been proposed. This can lead to a reduction in the costs of foundation design and implementation. According to the results, the lowest settlement (41 mm) was for the conditions where 5 layers of geogrid were used. The most optimal geogrid length and depth of the first geogrid layer to reduce the settlement is equal to 2.5 and 0.5 times the foundation width, respectively. Also, the lowest settlement (80.5 mm) for geogrid with tensile strength of 4500 kN/m was obtained. Finally, the accuracy of the results has been checked based on the modeling of actual data published by Laviza et al.
Keywords
Numerical evaluation
Geogrid
Reinforced soil
Foundation settlement
PLAXIS
Abu-Farsakh, M., Chen, Q., Sharma, R., Zhang, X (2008) Large-Scale model footing tests on geogrid-reinforced foundation and marginal embankment soils. Geotechnical Testing Journal, 31: 413–423. https://doi.org/10.1520/GTJ101465.
Adams, M. T., Collin, J. G )1997 (Large model spread footing load tests on geosynthetic reinforced soil foundations. Journal of Geotechnical and Geoenvironmental Engineering, 123: 66–72.
Alamshahi, S., Hataf, N (2009) Bearing capacity of strip footings on sand slopes reinforced with geogrid and grid-anchor. Geotextiles and Geomembranes, 27: 217–226. doi.org/10.1016/j.geotexmem.2008.11.011.
Basudhar, P. K., Dixit, P. M., Gharpure, A., Deb, K (2008) Finite element analysis of geotextile-reinforced sand-bed subjected to strip loading. Geotextiles and Geomembranes, 26: 91–99. doi.org/10.1016/j.geotexmem.2007.04.002.
Bathurst, R. J., Naftchali, F. M (2021) Geosynthetic reinforcement stiffness for analytical and numerical modelling of reinforced soil structures. Geotextiles and Geomembranes, 49(4): 921–940. https:// doi.org/ 10. 1016/j.
Chen, Q., Abu-Farsakh, M. Y., Sharma, R., Zhang, X (2007) Laboratory investigation of behavior of foundations on geosynthetic reinforced clayey soil. Journal of the Transportaion Research Board, 2004: 28–38. https://doi.org/10.3141/2004-04.
Damians, I. P., Bathurst, R. J., Josa, A., Lloret, A (2014) Numerical study of the influence of foundation compressibility and reinforcement stiffness on the behavior of reinforced soil walls. International Journal of Geotechnical Engineering, 8 (3): 247–259. doi.org/10.1179/1939787913Y.0000000039.
Das, B. M., Omar, M. T (1994) the effects of foundation width on model tests for the bearing capacity of sand with geogrid reinforcement. Geotechnical and Geological Engineering, 12: 133–141. https://doi.org/10.1007/BF00429771.
Dhatrak, A. I., Khan Farukh, A (2014) Behaviour of square footings on prestressed geosynthetic reinforced sand. The International of Engineering and Science, 3: 72–83. https://doi.org/09.1913/0373072083.
Entezami, M., Akhlaghi, T (2013) the application of geosynthetics in reinforcing and increasing the height of earthen dams. The Conference on Commercialization, National Development and Engineering Sciences, Sari, Iran (In Persian).
Guido, V. A., Chang, D. K., Sweeny, M. A (1986) Comparison of geogrid and geotextile reinforced slabs. Canadian Geotechnical Journal, 20: 435–440. https://doi.org/10.1139/t86-073.
Guo, X., Pham, T. A., Dias, D (2023) Multi-objective optimization of geosynthetic-reinforced and pile-supported embankments. Acta Geotechnica, 18: 3783–3798. https://doi.org/10.1007/s11440-022-01782-4.
Hamidi, A., Hooresfand, M (2013) Effect of reinforcement on triaxial shear behavior of cement treated sand. Geotextiles and Geomembranes, 36: 1–9. doi.org/10.1016/j.geotexmem.2012.10.005.
Lackner, C., Bergado, D. T., Semprich, S (2013) Prestressed reinforced soil by geosynthetics - Concept and experimental Investigations. Geotextiles and geomembranes, 37: 109–123. doi.org/10.1016/j.geotexmem.2013.02.002.
Latha, G. M., Somwanshi, A (2009) Bearing capacity of square footings on geosynthetic reinforced sand. Geotextiles and Geomembranes, 27: 281–294. doi.org/10.1016/j.geotexmem.2009.02.001.
Lovisa, J., Shukla, S. K., Sivakugan, N (2010) Behaviour of Prestressed geotextile- reinforced Sand bed supporting a loaded circular footing. Geotextiles and Geomembranes, 28: 23–32. doi.org/10.1016/j.geotexmem.2009.09.002.
Maharaj, D. K (2003) Nonlinear finite element analysis of strip footing on reinforced clay,” The Electronic Journal of Geotechnical Engineering, 8, Bundle C.
Naeini, S. A., Gholampoor, N (2014) cyclic behavior of dry silty sand reinforced with a geotextile. Geotextiles and Geomembranes, 42: 611–619.
Naftchali, F. M., Bathurst, R. J (2022) Influence of geosynthetic stiffness on analytical solutions for reinforced fill over void. Geosynthetics International, 30(1): 95–107. https://doi.org/10.1680/jgein.21.00015a.
Omar, M. T., Das, B. M., Yen, S. C., Puri, V. K., Cook, E. E (1993) Ultimate bearing capacity of rectangular foundations on geogrid-reinforced sand. Geotechnical Testing Journal, 16: 246–252. https://doi.org/10.1520/GTJ10041J.
Pham, T. A (2022) Design and analysis of geosynthetic-reinforced and loating column-supported embankments. International Journal of Geotechnical Engineering, 16(10): 1276–1292.
PLAXIS (2005) PLAXIS Version 8.2, Reference manual, Web: http://www.plaxis.nl.com.
Ramaswamy, S. D, Puroshothama, P (1992) Model footings of geogrid reinforced clay. Proceedings of the Indian Geotechnical Conference on Geotechnique Today, 1: 183–186.
Sharifpour, K., Saba, H. R., Mohamadi, S (2014) Comparison of geosynthetic performance on the bearing capacity of reinforced fine-grained and coarse-grained soils. The First Iranian Conference on Geotechnical Engineering, Ardabil, Iran (In Persian).
Shin, E. C., Das, B. M., Lee, E. S., Atalar, C (2002) Bearing capacity of strip foundation on geogrid-reinforced sand. Geotechnical and Geological Engineering, 20: 169–180. https://doi.org/10.1023/A:1015059427487.
Shivashankar, R., Jayaraj, J (2013) Effect of prestressing the reinforcement on the behavior of reinforcement on the behavior of reinforced granular beds overlying weak soil. Geotextiles and Geomembranes, 42: 69–75. doi.org/10.1016/j.geotexmem.2013.08.008.
Yang, S. D., Yu, X. J (2011) the experimental study on the dynamic behavior of reinforced silty. International Conference on Electric Technology and Civil Engineering, 2745–2750. doi.org/10.1109/ICETCE.2011.5775696.
Yetimoglu, T., Wu, J. T. H., Saglamer, A (1994) Bearing capacity of rectangular footings on geogrid-reinforced sand. Journal of Geotechnical Engineering, 120: 2083–2099.
Yu, Y., Bathurst, R. J., Allen, T. M (2016) Numerical modelling of the SR-18 geogrid reinforced modular block retaining walls. Journal of Geotechnical and Geoenvironmental Engineering, 142 (5): 04016003.
Yu, Y., Bathurst, R. J., Allen, T. M (2017) Numerical modelling of two full-scale reinforced soil wrapped-face walls. Geotextiles and Geomembranes, 45 (4): 237–249. doi.org/10.1016/j.geotexmem.2017.02.004.

  • Receive Date 08 April 2024
  • Revise Date 17 June 2024
  • Accept Date 16 June 2024