Abstract
A series of laboratory tests were performed to investigate the variation of the unconfined compression strength according to the temperature change of weathered granite soil and clayey soil. The temperatures were low down below zero. During the tests, the variations of unfrozen water contents and ultrasonic wave velocities were also tested and the interrelationship of these three factors were analyzed. Test results are summarized as follows : 1)As the temperatures were lowered, the unconfined compressive strength was increased rapidly in weathered granite soil, but the unconfined compressive strength was increased relatively slow in clayey soil compared with weathered granite soil. 2)At the same temperature blow zero, the unconfined compressive strength was higher in weathered granite soil than in clayey soil. 3)As the temperatures were lowered, Young's modulus was increased in both weathered granite soil and clayey soil, but Poisson's ratio was decreased slightly in both soils. 4)Ultrasonic wave velocity and Young's modulus were increased with increasing strength in both weathered granite soil and clayey soil. 5) The unconfined compressive strength was decreased with increasing unfrozen water contents in both weathered granite soil and clayey soil.
화강토와 점성토의 온도를 영하로 점점 낮추면서 일축압축강도가 어떻게 변하는지를 실험하였다. 이 과정에서 동결토속에 얼지 않고 남아 있는 부동수분과 동결토의 초음파속도가 어떻게 달라지는지를 실험하였으며, 이 세 가지 요소들의 상호관계를 분석하였다. 실험 결과 온도가 낮아질수록 화강토는 급격한 강도증가를 보인 반면, 점성토는 상대적으로 완만하게 강도가 증가하였다. 또한 동결된 화강토는 동결된 점성토보다 동일온도에서 더 큰 일축압축강도를 나타냈다. 그리고 화강토와 점성토 모두에서 온도가 낮아질수록 탄성계수는 증가하고, 포아슨비는 약간씩 감소하는 경향을 보였다. 아울러 화강토와 점성토 모두에서 일축압축강도가 증가할수록 초음파속도와 탄성계수는 증가하였다. 반면에 부동수분이 증가할수록 일축압축강도는 감소하였다.