Numerical Study of the Dynamic Response of Stone Column and Geosynthetic Encased Stone Column in Soft Clay
Publication: Geo-Congress 2023
ABSTRACT
Stone columns (SC) are widely used for ground improvement of soft clay. Geosynthetic can be used as encasement for conventional stone column, which forms geosynthetic encased stone column (GESC). This technology can reduce the lateral displacements of stone column and improve the bearing capacity in soft clay through the restraint of geosynthetic encasement. This paper presents a numerical study to investigate the dynamic response of SC and GESC, with the goal of evaluating the effect of geosynthetic encasement. Simulations were conducted using the finite difference program FLAC3D to investigate the response of SC and GESC in soft clay ground under dynamic loading. Both the stone column and the soft clay were characterized using nonlinear elasto-plastic models that consider the hysteretic behavior. Geosynthetic encasement was characterized using linearly elastic geogrid elements. The dynamic response of SC and GESC for a sinusoidal motion was investigated and compared. Simulation results indicated that the geosynthetic encasement can effectively reduce the settlements of stone column and soft clay under dynamic loading.
Get full access to this article
View all available purchase options and get full access to this chapter.
REFERENCES
Alexiew, D., Brokemper, D., and Lothspeich, S. (2005). “Geotextile encased columns (GEC): Load capacity, geotextile selection and pre-design graphs.” Proc., Geo-Frontiers Conf., ASCE, Reston, VA, 497–510.
Almeida, M. S. S., Hosseinpour, I., and Riccio, M. (2013). “Performance of a geosynthetic-encased column (GEC) in soft ground: numerical and analytical studies.” Geosynthetics International, 20 (4), 252–260.
Koerner, R. (2005). Designing with geosynthetics. Pearson Prentice Hall, Upper Saddle River, New Jersey.
Cengiz, C., and Guler, E. (2018a). “Seismic behavior of geosynthetic encased columns and ordinary stone columns.” Geotextiles and Geomembranes, 46(1), 40–51.
Cengiz, C., and Guler, E. (2018b). “Shaking table tests on geosynthetic encased columns in soft clay.” Geotextiles and Geomembranes, 46(6), 748–758.
Cengiz, C., and Guler, E. (2020). “Load bearing and settlement characteristics of Geosynthetic Encased Columns under seismic loads.” Soil Dynamics and Earthquake Engineering, 136, 106244.
Elsawy, M. B. D. (2013). “Behaviour of soft ground improved by conventional and geogrid encased stone columns, based on FEM study.” Geosynthetics International, 20 (4), 276–285.
Gu, M., Zhao, M., Zhang, L., and Han, J. (2016). “Effects of geogrid encasement on lateral and vertical deformations of stone columns in model tests.” Geosynthetics International, 23(2), 100–112.
Hosseinpour, I., Almeida, M. S. S., and Riccio, M. (2015). “Full-scale load test and finite-element analysis of soft ground improved by geotextile-encased granular columns.” Geosynthetics International, 22(6), 428–438.
Murugesan, S., and Rajagopal, K. (2010). “Studies on the behavior of single and group of geosynthetic encased stone columns.” Journal of Geotechnical and Geoenvironmental Engineering, 136(1), 129–139.
Schnaid, F., Winter, D., Silva, A. E. F., Alexiew, D., and Küster, V. (2017). “Geotextile encased columns (GEC) used as pressure-relief system. Instrumented bridge abutment case study on soft soil.” Geotextiles and Geomembranes, 45, 227–236.
Rajagopal, K., and Murugesan, S. (2008). “Shear Load Tests on Stone Columns With and Without Geosynthetic Encasement.” Geotechnical Testing Journal, 32(1), 76–85.
Rayamajhi, D., et al. (2016). “Dense granular columns in liquefiable ground. I: shear reinforcement and cyclic stress ratio reduction.” Journal of Geotechnical and Geoenvironmental Engineering, 142(7), 04016023.
Yoo, C., and Lee, D. Y. (2012). “Performance of geogrid-encased stone columns in soft ground: full-scale load tests.” Geosynthetics International, 19 (6), 480–490.
Information & Authors
Information
Published In
Geo-Congress 2023
Pages: 447 - 455
History
Published online: Mar 23, 2023
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.