Evaluation Method for the Liquefaction Potential Using the Standard Penetration Test Value Based on the CPTU Soil Behavior Type Index

Taking the project of the Su-xin highway treated by using the resonant compaction method as the reference, a new method for the evaluation of liquefaction potential is proposed based on the piezocone penetration test (CPTU) and the standard penetration test (SPT). The soil behavior type index (I_c) obtained from CPTUs and the standard penetration test index (N_63.5), obtained from SPTs, are analyzed for saturated silty sand and silt. The analysis result reveals a linear relationship betweenN_63.5andI_c, given by_N63.5=−18.8_Ic+52.0. The larger the value ofI_cis, the greater the viscosity of soil is, and the smaller the value ofN_63.5is. According to the method, liquefaction assessment of saturated silty sand and silt foundation can be conducted by usingN_63.5based on the Code of Seismic Design of Building.N_63.5is expressed by a singleI_c, which is calculated from the CPTU data. Compared with existing evaluation methods, this method can provide continuous standard penetration test values, moreover, this method involves a simple calculation, and the results obtained using the method are reliable.

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