CPT-DMT Correlations on Regional Soils from Croatia

Area of Science:

• Geotechnical Engineering
• Soil Mechanics
• In-situ Testing

Background:

• Accurate soil characterization is crucial for engineering projects.
• Intermediate soils, common in Croatia, pose challenges for standard analysis.
• In-situ testing provides valuable data for soil property determination.

Purpose of the Study:

• To compare and validate the constrained modulus derived from CPTu and DMT tests.
• To analyze the performance of these methods across different soil types, including intermediate soils.
• To improve the accuracy of soil characterization for engineering applications.

Main Methods:

• In-situ measurements using Cone Penetration Test with pore pressure measurement (CPTu) and Dilatometer Test (DMT).
• Comparison of CPTu cone resistance (Qt1) with DMT parameters (ED/σ'v0 and KD).
• Analysis of soil data grouped by soil type (clay, silt) and subgroups based on identification parameters.

Main Results:

• The constrained modulus from CPTu was validated against DMT results.
• Significant deviations were observed for intermediate soil groups compared to published data.
• Subgroup analysis revealed distinct results for clay and silty soils.

Conclusions:

• The study highlights the need for localized soil characterization, especially for intermediate soils.
• CPTu and DMT provide complementary data for reliable soil property estimation.
• The findings offer improved methods for calculating constrained modulus, enhancing engineering practice.