Abstract
Abstract This article contains the analysis of the correlation between the cone resistance qc from CPTU tests and shear modulus G0 determined from seismic tests SDMT and SCPTU. The analysis was performed for sands located in Poland, characterised by differential grain size distribution and origin. The significant impact of the independent variables; grain size, preconsolidation stress σ’p , geostatic vertical stress σ’v0 and relative density index on the dependencies analysed, were examined in three stages. Firstly, a general relationship between the cone resistance and shear modulus G0 was established; in the second stage, an analysis was carried out in selected groups of subsoil; and in the third stage, the influence of other independent variables was taken into account. In each stage, the functional form of the dependency was determined, and their statistical significance was assessed throughout coefficient of determination R2. For more variables, multivariable regression analysis was applied for assessment. Conducted analysis showed that the overall view of the relation between the cone resistance qc and shear modulus G0 has low evaluation of the statistical significance. This fact is consistent with the theoretical assessment of this relationship. To obtain a satisfactory assessment of this dependency, it is necessary to construct empirical equations for individual groups of soil, taking into account other independent variables; preconsolidation stress σ’p , vertical stress σ’vo and relative density index. This approach allows to assess the local correlation relationship, which is very useful during the geological project.
Highlights
This article contains the analysis of the correlation between the cone resistance qc from CPTU tests and shear modulus G0 determined from seismic tests SDMT and SCPTU
The first and second stage of the analysis showed that the dominant role in the analysed correlation between shear modulus G0 and cone resistance qc is played by both the stress history, which modifies the state of stress, and the origin and grain size distribution of soils
The conducted tests show that the correlation between cone resistance from the SCPTU method and shear modulus G0 is an effective way to determine changes in this modulus in a non-cohesive subsoil
Summary
Abstract: This article contains the analysis of the correlation between the cone resistance qc from CPTU tests and shear modulus G0 determined from seismic tests SDMT and SCPTU. To obtain a satisfactory assessment of this dependency, it is necessary to construct empirical equations for individual groups of soil, taking into account other independent variables; preconsolidation stress σ’p, vertical stress σ’vo and relative density index. This approach allows to assess the local correlation relationship, which is very useful during the geological project. In the event of a significant variability in the construction of the subsoil found under the designed structure, it is necessary to continuously assess the changes in modulus G0 of the studied profiles Such an assessment can be obtained from the empirical correlation between cone resistance qc from CPTU and small strain shear modulus G0. Due to the aforementioned large number of variables affecting cone resistance, the analysis was limited to non-cohesive soils of different genesis and preconsolidation effect
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