재하-제하과정에서 발생하는 흙의 변형계수 및 포아송비의 특성
Characteristics of Deformation Modulus and Poisson’s Ratio of Soil by Unconfined Loading-Reloading Axial Compression Process
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초록
Prediction of soil behavior should be interpreted based on the level of axial strain in the actual ground. Recently numerical methods have been carriedout focus on the state of soil failure. However considered the deformation of soil the prior to failure, mostly the small strain occurring in the elastic rangeis considered. As a result of calculating the deformation modulus to 50% of the maximum unconfined compression strength, Deformation modulus (E50)showed a tendency to increase according to the degree of compaction by region. The Poisson’s ratio during loading-unloading was 0 .63, which washigher than the literature value of 0.5. For the unconfined compression test under cyclic loading for the measurement of permanent strain, the maximumcompression strength was divided into four step and the test was performed by load step. Changes in permanent strain and deformation modulus werechecked by the loading-unloading test for each stage. At 90% compaction, the permanent deformation of the SM sample was 0.21 mm, 0.37 mm, 0.6 mm,and 1.35 mm. The SC samples were 0.1 mm, 0.17 mm, 0.42 mm, and 1.66 mm, and the ML samples were 0.48 mm, 0.95 mm, 1.30 mm, and 1.68 mm.
Abstract
Prediction of soil behavior should be interpreted based on the level of axial strain in the actual ground. Recently numerical methods have been carriedout focus on the state of soil failure. However considered the deformation of soil the prior to failure, mostly the small strain occurring in the elastic rangeis considered. As a result of calculating the deformation modulus to 50% of the maximum unconfined compression strength, Deformation modulus (E50)showed a tendency to increase according to the degree of compaction by region. The Poisson’s ratio during loading-unloading was 0 .63, which washigher than the literature value of 0.5. For the unconfined compression test under cyclic loading for the measurement of permanent strain, the maximumcompression strength was divided into four step and the test was performed by load step. Changes in permanent strain and deformation modulus werechecked by the loading-unloading test for each stage. At 90% compaction, the permanent deformation of the SM sample was 0.21 mm, 0.37 mm, 0.6 mm,and 1.35 mm. The SC samples were 0.1 mm, 0.17 mm, 0.42 mm, and 1.66 mm, and the ML samples were 0.48 mm, 0.95 mm, 1.30 mm, and 1.68 mm.
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