Abstract
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 (Ic) obtained from CPTUs and the standard penetration test index (N63.5), obtained from SPTs, are analyzed for saturated silty sand and silt. The analysis result reveals a linear relationship between N63.5 and Ic, given by N63.5=−18.8Ic+52.0. The larger the value of Ic is, the greater the viscosity of soil is, and the smaller the value of N63.5 is. According to the method, liquefaction assessment of saturated silty sand and silt foundation can be conducted by using N63.5 based on the Code of Seismic Design of Building. N63.5 is expressed by a single Ic, 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.
Highlights
Liquefaction-induced failure of earth structures, such as road embankments and earth dams, is identified as one of the most dramatic threats of earthquakes [1,2,3]
There are two major methods for the evaluation of liquefaction potential, namely, laboratory test and in situ test. e in situ test method is widely used because it involves a small disturbance and is relatively good at representing the liquefaction potential. e typical methods of liquefaction evaluation are based on in situ tests, such as the cone penetration test (CPT) and the standard penetration test (SPT), which are preferred by geotechnical engineers to assess liquefaction potential of soils [7, 8]
Liquefaction Assessment Using the Standard Penetration Test Value Based on the CPTU Soil Behavior Type Index
Summary
Liquefaction-induced failure of earth structures, such as road embankments and earth dams, is identified as one of the most dramatic threats of earthquakes [1,2,3]. E typical methods of liquefaction evaluation are based on in situ tests, such as the cone penetration test (CPT) and the standard penetration test (SPT), which are preferred by geotechnical engineers to assess liquefaction potential of soils [7, 8]. Rough several stages of modification by Seed et al and others [10,11,12,13], more mature and complete implementation of the CPT has been achieved In this method, liquefaction “loading” is expressed by the CSR (cyclic stress ratio, which represents the cyclic loading on the soil), and the liquefaction “resistance” is expressed by the CRR (cyclic resistance ratio, which is the Advances in Civil Engineering capacity of a soil layer to resist liquefaction) [14, 15]. The calculation of CSR and CRR is complex and inconvenient to apply in the field
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