Abstract
본 연구에서는 직접전단시험을 이용하여 동래, 인제 및 연기 3개 지역의 교란 및 비교란 화강풍화토의 전단강도에 대한 포화도(또는 함수비) 및 교란 영향을 조사하였다. 0에서 100% 범위의 5개의 서로 다른 포화도를 가지는 교란 및 비교란 시편에 대하여 여러 번의 직접전단시험이 수행되었다. 전단시험 결과로부터 흙구조 교란에 따른 화강풍화토의 점착력 감소비(CRR)는 45-82% 범위로 크나, 마찰각 감소비(FRR)는 6-11% 범위로서 다소 작다는 것을 알 수 있다. 또한 화강풍화토의 겉보기 점착력과 내부마찰각은 포화도가 증가함에 따라 감소한다. 실험결과로부터 동래, 인제 및 연기 지역의 불포화 화강풍화토의 전단강도는 강우침투로 인한 함수비 증가 혹은 흙구조의 교란에 의해서 감소한다는 것을 알 수 있다. This study investigates the effects of degree of saturation (or water content) and disturbance on the strength reduction for both disturbed and undisturbed samples of weathered granite soil using direct shear test. Several series of direct shear tests were carried out on undisturbed or disturbed samples with 5 different degrees of saturation ranging from 0 to 100%. The direct test results showed that the values of cohesion reduction ratio (CRR) of weathered granite soil were in the range of 45 - 82 %, while the values of friction angle reduction ratio (FRR) in the range of 6 - 11%. Apparent cohesion and friction angle of weathered granite soils also decreased with an increase in degree of saturation. The results indicated that shear strength of unsaturated weathered granite soil at Dongrae, Inje and Yeonki sites tends to reduce due to an increase of water content induced from rainfall infiltration and/or due to disturbance of soil structure.
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