A Study on Uniaxial Compressive Strength and Ultrasonic Non-Destructive Analysis of Fine-Grained Soil in Seasonally Frozen Regions

Understanding the physical and mechanical properties of soils subjected to freeze-thaw cycles, including both micro macrostructures, is critical for achieving required performance structures employing it as a structural or support material. An experimental study was carried out on clay soil with varying water content (18%, 21.5%, 23%) after repeated cycles (0, 2, 5, 7, 12, 15). The evaluated using unconfined compressive strength (UCS) ultrasonic pulse velocity (UPV) tests. results demonstrated that UCS peak values were observed at lowest before cycles. stress-strain curves exhibited strain-softening behavior, this condition transitioned strain hardening behavior increment in content. Moreover, highest UPV increase due capillary forces minimum Also, an number resulted decrease UPV. According correlations between values, contents obtained optimum content, decreasing trend experiencing periods. In addition, Grey Correlation Analysis performed show degree correlation UPV, well have greater impact than other parameters.