The Relationship between Soil Extrusion Force in Soil Extrusion Process and Undrained Shear Strength

Abstract

This research aims to study the relationship between the extrusion force applied to the soil sample during the soil extrusion process and the undrained shear strength from the unconfined compression test. The sampling site is the Research and Analysis Division, Civil Engineering Department, The state railway of Thailand in Jatuchak, Bangkok. A total of 105 samples were obtained from seven boreholes with a thin wall of 2.5-inch diameter. Samples were collected at every one meter up to 15 meters belowground. Atterberg's limit of the soil sample, including Liquid Limit (L.L.), is in the range of 26.33-88.10%, the Plastic Limit(P.L.) is in the range of 15.42-49.31%, and the natural moisture content is in the range of 12.41-75.88%. The study found that extrusion force applied to the soil sample directly related to the undrained shear strength.