Abstract: The potential impact of temperature changes on the properties and behavior of soils is crucial in geotechnical engineering design and applications. A calculation model and analysis method based on cavity expansion theory are proposed to assess the temperature effects and partially drainage conditions of piezocone penetration test (CPTu) in silt. A constitutive model characterizing the temperature effect of silt strength is adopted, with analytical solutions provided for fully undrained and drained conditions. Using Bourke silt as an example, the influence of temperature on expansion pressure is analyzed, revealing that expansion pressure decreases as temperature increases. A semi-analytical solution for cavity expansion under partial drainage condition derived using a linear mapping method. The correlation between drainage state and temperature is established based on physical model test results. Consequently, a CPTu calculation model considering the temperature effect and drainage condition of silty soil is established. This study examines the influence of temperature on CPTu test results at different penetration rates. The results indicate that increased temperature reduces cone tip resistance and pore pressure at the probe shoulder, with the change amplitude increasing as the over-consolidation ratio rises. Finally, the reliability of the model is verified by comparing its predicted results with experimental data.

Key words: piezocone penetration test, cavity expansion theory, silt, partially drained, temperature effect