Abstract
Liquefaction assessment is the main stage in determining the potential liquefaction in a certain site. In order to assess the potential liquefaction, the values of physical and mechanical properties of the soil are very important. Two main parameters that are essentially needed to determine the liquefaction potential in a sand deposit; those are relative density and men particle size. In Indonesia, CPT is a testing method that is very practically famous and often conducted in the field. Assessment of Liquefaction Potential will be cheap and valuable by using the results of the CPT test. For this reason, this paper describes the results of conducted research to obtain the values of the relative density and mean particle size based on the outcomes of the CPT test: those are cone resistance (qc) and friction ration (Rf). The relationship between qc-Rf and Dr-D50 is accelerated by conducting a series of tests on soil samples with variations in the value of relative density and average particle size. The test results are plotted in a graph as well as in the terms of mathematical formulations to figure out for the relationship between CPT values and Dr-D50 in detail for sands. This research is very useful to assess the liquefaction potential in a particular area with very satisfying results
Highlights
The soil liquefaction potential analysis procedure using the complicated "simplified" method [1] based on a liquefaction potential factor, (PL) as well as a liquefaction resistance factor (FL) have been proposed in 1981 [2]
The sleeve resistance usually is compared by the tip resistance in terms of friction ratio (Fr). The both tip resistance and friction ratio of Cone Penetration Test (CPT) tests have been used to gain the other parameters for liquefaction analysis
The parameters obtained basically taken from the correlation of the CPT test results from field soil investigation
Summary
The soil liquefaction potential analysis procedure using the complicated "simplified" method [1] based on a liquefaction potential factor, (PL) as well as a liquefaction resistance factor (FL) have been proposed in 1981 [2]. The LPI indicates the damage level at the ground surface at the site of interest This value relates to the factors of safety for liquefaction potential at the deeper point underneath. Using CPT test result and its correlation to relative density and size of soil grain, the liquefaction potential assessment can be developed. The liquefaction potential at certain depth in the soil layer may be determined by plotting those values (the relative density and the average grain size) in to the Fig. 2. The application of this method has been proven to many real cases in the fields and gave very good results [14]. The correlation is developed by adopting result for past researcher's result from references
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