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반복하중(反復荷重),온도변화(溫度變化) 및 초기조건(初期條件)이 충적점토(沖績粘土)의 구조변화(構造變化)와 역학적(力學的) 특성(特性)에 미치는 영향(影響)
류능환 ( Ryu Neung Hwan ),류형선 ( Ryu Young Sun ),최중대 ( Choi Joong Dae ),김기성 ( Kim Ki Sung ) 한국농공학회 1992 韓國農工學會誌 : 전원과 자원 Vol.34 No.4
To estimate soil behavior and structural characteristics under the conditions of cyclic loa-ding freezing & thawing and initial state, several testing was performed and obtained follo-wing results. 1. After repeated freezing and thawing processes, original soil structure was destroyed and changed to globular structure from honeycomb or tube in its structure types. Also above processes resulted increasing the soil compression strain while decreasing the failure stress in stress-strain relationship and reached the soil structure into the mode of brittle fracture Under cyclic lading conditions, soil cluster which was originally dispersed structure colloided with each other, separated, and finally the soil failed due to the effect of overcompaction. 2. Through the stabilization processes separated by four steps, the structure of soil skeleton was changed to quite different globular type. The degree of compressibility of soil skeleton was changed to quite different globular type. The degree of compressibility of soil was decree-sed in the normally consolidated zone, while the strength against external load increased due to soil particle stabilization. 3. Soil stress-strain characteristics were largely influenced by repeated up and down proce-sses of temperature. The maximum deformation was obtained in the case of temperature between 0~10℃ by the reseon of particle cluster reformation. 4. Soil compressibility was largely influenced by the optimum moisture content. Under freezing process, swelling could be found and its magnitude was proportional to the density of soil. 5. Density of soil was decreased as increasing the number or repeated freezing and thawing processes and the largest decreasing rate was found at the first turning point from freezing to thawing cycle.