Hayley, Dr. JocelynKhurana, Aditi2017-10-022017-10-0220172017Khurana, A. (2017). Evaluation of Dissolved Gas Pressure in Sandy Soils (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/25986http://hdl.handle.net/11023/4191Gassy sandy soils commonly occur in offshore regions, and slope failures during unloading are often inevitable in such soils as gas bubbles affect the compressibility of the pore fluid and integrity of the soil matrix. The ratio of pore water pressure to total dissolved gas pressure (PTDG) controls if and when free gas forms during unloading. PTDG has commonly been assumed equal to the pore water pressure, which may result in incorrect estimates during modeling and prediction of gassy soil induced failures. In this thesis, both total dissolved gas pressure and pore water pressure in gassy sandy soils were measured in a specially designed laboratory program that involved pressure reductions with undrained rebound conditions. It was concluded that PTDG and pore water pressure are not equal for sometime after the pressure reduction takes place. This difference in the two pressures accounts for the capillary pressure or surface tension effects.engUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.GeotechnologyGassy soilsmaster thesis10.11575/PRISM/25986