In an effort to determinate the effect of gas on soil response under dynamic loading conditions and to better understand how gassy soil behaves, a research laboratory testing program was performed, including a series of Ko-consolidated, undrained strain-controlled static and rapid direct simple shear tests on gassy marine clay samples with methane gas, and for a deep pile foundation investigation was performed a series of anisotropically consolidated cyclic triaxial compression tests on gassy marine sand samples with carbon dioxide gas. Both soil types exhibited a faster and more pronounced response during dynamic loading, and it is theorized that the hardening process caused the gas to reduce its volume during the dynamic loading, therefore increasing the sample’s rigidity until the pressure exceeded the confining pressure provided by the soil structure or fabric.
Raúl Nava-Castro and Kuat C. Gan
Keywords: Gassy soils, static and rapid direct simple shear, cyclic triaxial, hardening process
Publisher: DFI