Study on Correlation between Dynamic Cone Resistance and Shear Strength for Frozen Sand-Silt Mixtures under Low Confining Stress
낮은 구속응력에서 모래-실트 혼합토의 동결강도 평가를 위한 동적 콘 저항력 및 전단강도 상관성 연구

Sangyeob Kim, Jong-Sub Lee, Seungseo Hong, Yong-Hoon Byun
2016 Journal of the Korean geoenvironmental society  
Investigation of in-situ ground in cold region is difficult due to low accessibility and environmental factors. In this study, correlation between dynamic cone resistance and shear strength is suggested to estimate the strength of frozen soils by using instrumented dynamic cone penetrometer. Tests were conducted in freezing chamber after preparing sand-silt mixture with 2.3% water content. Vertical stresses of 5 kPa and 10 kPa were applied during freezing, shearing, and penetration phase to
more » ... ration phase to compare the dynamic cone resistance and shear strength. The dynamic cone resistance, additionally, is calculated to minimize the effect of energy loss during hammer impact. Experimental results show that as the shear strength increases, the dynamic cone penetration index (DCPI) decreases nonlinearly, while the dynamic cone resistance increases linearly. This study provides the useful correlation to evaluate strength properties of the frozen soils from the dynamic cone penetration and direct shear tests.
doi:10.14481/jkges.2016.17.1.5 fatcat:l6vjequlkvainas6lkntl6mc3y