Experimental Evaluation of Encased Stone Column Technique for Liquefaction Mitigation
The present paper investigates the effectiveness of using geotextile encased stone column for mitigating the liquefaction phenomenon in saturated sandy deposits. Reduced scale 1-g model tests were conducted using a uniaxial shake table to study the behavior of loose saturated sand reinforced with encased stone columns when subjected to harmonic (sinusoidal) loading. Additionally, the response of saturated sand reinforced with stone column, with and without geotextile encasement is also studied and compared. The test results show that the installation of stone column in the saturated loose sand increases the liquefaction resistance of sand. The presence of geotextile allows quicker dissipation of pore water which results in an improved liquefaction resistance of sand. Moreover, the acceleration amplitude influences the response of both the unreinforced and reinforced sand. The increase in acceleration amplitude increases the magnitude of excess pore water pressure ratio. Furthermore, the presence of stone column also reduces the settlement of the shallow foundation.
KeywordsLiquefaction Encased stone column Shaking table tests Geotextile
The authors would like to thank the Director, CSIR-Central Building Research Institute, Roorkee for giving permission to publish this research work. The authors would also like to thank the Head, Geotechnical Engineering Division, CSIR-CBRI for his continuous support during this research work. The authors also wish to thank the anonymous reviewers for their valuable time and suggestions.
- 1.Seed, R.B., et al.: Preliminary report on the principal geotechnical aspects of the October 17, 1989 Loma Prieta earthquake. Earthquake Engineering Research Center, University of California (1990)Google Scholar
- 3.Kramer, S.L.: Geotechnical Earthquake Engineering. Prentice Hall, New York (1996)Google Scholar
- 4.Seed, H.B., Booker, J.R.: Stabilization of potentially liquefiable sand deposits using gravel drains. J. Geotech. Geoenv. Eng. 103(ASCE 13050) (1977)Google Scholar
- 6.Iai, S., Koizumi, K., Noda, S., Tsuchida, H.: Large scale model tests and analyses of gravel drains. In: Proceedings of Ninth World Conference on Earthquake Engineering, Tokyo, Japan (1988)Google Scholar
- 7.Mitchell, J.K., Wentz, F.J.: Performance of improved ground during the Loma Prieta Earthquake, vol. 91, no. 12. Earthquake Engineering Research Center, University of California (1991)Google Scholar
- 8.Mitchell, J.K., Baxter, C.D., Munson, T.C.: Performance of improved ground during earthquakes. In: Soil Improvement for Earthquake Hazard Mitigation, pp. 1–36. ASCE (1995)Google Scholar
- 13.IS 1498: Classification and Identification of Soils for General Engineering Purposes. Bureau of Indian Standards, New Delhi (2007)Google Scholar
- 17.Lombardi, D., Bhattacharya, S.: Shaking table tests on rigid soil container with absorbing boundaries. In: Proceedings of 15th World Conference on Earthquake Engineering, Lisbon, Portugal (2012)Google Scholar