In situ-based assessment of soil liquefaction potential–Case study of an earth dam in Tunisia

Abstract

The present paper examines the evaluation of liquefaction potential of an earth dam foundation in Tunisia. The assessment of soil liquefaction was made using deterministic and probabilistic simplified procedures developed from several case histories. The data collected from the field investigation performed before and after the vibrocompaction are analyzed and the results are reported. The obtained results show that after vibrocompaction, a significant improvement of the soil resistance reduces the liquefaction potential of the sandy foundation. Indeed, in the untreated layers, the factor of safety FS drops below 1 which means that the soil is susceptible for liquefaction. However, in the compacted horizons, the values of FS exceed the unit which justifies the absence of liquefaction hazard of the foundation.

Keywords

liquefaction / cone penetration test (CPT) / standard penetration test (SPT) / vibrcompaction / sand

References

[1] Boulanger R W, Idriss I M. Soil liquefaction during earthquake. Engineering monograph-EERI, California, 2008, 266

[2] Robertson P K, Wride C. Evaluating cyclic liquefaction potential using the cone penetration test. Canadian Geotechnical Journal, 1998, 35(3): 442-459

[3] Technical document. Drainage and treatment of the foundation of Sidi El Barrak dam. Ministry of agriculture, Tunis, 1990, 63

[4] Blanchin M, Michalsky E R, Dequidt O, Giafferi J. La fondation du barrage de Sidi El Barrak. Journées Nationales de Géotechnique et de Géologie de l'ingénieur, 2002, 1-15

[5] Corté J P. Evaluation du risque de liquéfaction à partir des essais en place. Génie parasismique, Nantes, 1978, 12

[6] Seed B, Idriss I M. Simplified procedures for evaluating soil liquefaction potential. JSME, 1971, 97: 1249-1273

[7] Zhou S. Evaluation of the liquefaction of sand by static cone penetration test. In: Proceedings of the7th world conference on earthquake Engineering. Istanbul, Turkey, 1980, 3: 156-162

[8] Seed B, Idriss I M, Arango I. Evaluation of liquefaction potential using field performance data. Geotechnical Engineering, 1983, 109(3): 458-482

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