CPT based Soil Behaviour Type Material Index (Ic) Parameter for Carbonate Sediments

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4. CPT based Soil Behaviour Type Material Index (Ic) Parameter for Carbonate Sediments

This paper investigates the CPT-based I_c parameter for carbonate sediments and examines how their response compares with established correlations available in the literature. Laboratory tests performed on intact specimens were interpreted to develop correlation and derive typical zones of results in terms of I_c for different types of carbonate sediments. The parameters investigated include basic soil classification (i.e., fines content and soil plasticity) and flow and consolidation parameters (i.e., soil permeability and coefficient of consolidation). These parameters were selected so that I_c-based correlation for carbonate sediments can be compared with similar correlations available in the literature. Based on the review of results, it is shown that the CPT-based I_c parameter may be used as a basis to develop correlations for carbonate sediments. However, actual relationships or the boundaries used to classify the material types are likely to be different for carbonate sediments. It is shown that although the I_c based soil classification methods can be used to broadly differentiate between coarse-grained and fine-grained sediments, I_c alone is not sufficient to further classify the fine-grained materials in terms of SILT and CLAY. Furthermore, a typical range of results for soil permeability and coefficient of consolidation as a function of I_c are also presented. In addition, it is highlighted that soil permeability and coefficient of consolidation values estimated using an odometer are likely to be affected by the limiting value measurable in this test and any correlations developed based on these results are likely to be unreliable.

5th International Symposium on Frontiers in Offshore Geotechnics (ISFOG2025)

2 - Site characterization, in-situ and laboratory testing, measurement