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COMPARISON OF LIQUEFACTION ASSESSMENT RESULTS USING SPT AND CPTU DATA (2007)
This article explains how to find required criteria to prevent the liquefaction phenomenon for soil improvement in the Shahid Rajaee Port Project, Bandar Abbas, Iran. The site investigation shows some loose to medium dense sandy layers in different depths. Having low fines content, these layers are susceptible to be liquefied. Liquefaction of the soil behind the quay wall can ause large pressure and thus large deformations that might not be tolerable with the wall. Therefore the occurrence of liquefaction should be prevented by soil improvement. The soil improvement can help the quay wall to reduce the lateral movement and the applied pressure back the wall. In this paper, the liquefaction assessment of the ground layers behind the wall is performed using the ground investigation in-situ SPT and CPTu tests and finally the depth, thickness of liquefiable layer and the ground settlement are calculated. Based on these calculations, it is concluded that there are good agreements between these two procedures. Finally, a criterion based on SPT procedure is presented not to allow the soil be liquefied, which is dependent on the fines content of the soil. In other words, the soil layer should be so improved that the mentioned criterion will be satisfied. It is noted that it is not necessary to improve the deep liquefiable layers according to in-situ surcharge effect based on Ishihara criterion (1985), which is explained in the paper.
4th International Conference on Earthquake Geotechnical Engineering June 25-28, 2007 Paper No. 1475
Department of Civil Engineering, University of Tehran, Iran