Strength and stiffness variation of frozen soils according to confinement during freezing

作     者：SangYeob Kim JongSub Lee 

作者机构：School of CivilEnvironmental and Architectural EngineeringKorea University 

出 版 物：《Research in Cold and Arid Regions》 (寒旱区科学（英文版）)

年 卷 期：2015年第7卷第4期

页      面：335-339页

核心收录：

学科分类：07[理学] 0705[理学-地理学] 070501[理学-自然地理学] 

基　　金：supported by a gran (13IFIP-B06700801) from Plant Research Program funded by Korea Agency for Infrastructure Technolo gy Advancement 

主　　题：frozen soil strength stiffness shear confinement 

摘      要：When water between soil particles is frozen, the strength and stiffness behavior of soils significantly change. Thus, nu- merous experimental studies in the laboratory have been carried out to characterize the strength and stiffness of frozen soils. The goals of this study are to evaluate the strength characteristics of frozen soils, which underwent confinement in freezing and shearing stages, and to estimate the stiffness variation by shear wave velocity during shear phase. The specimens are prepared in a brass cell by mixing sand and silt with 10% degree of saturation at a relative density of 60%. The applied normal stresses as confining stresses are 5, 10, 25 and 50 kPa. When the temperature of the specimens is lowered up to -5 ~C, direct shear tests are carried out. Furthermore, shear waves are continuously measured through bender elements during shearing stage for the investigation of stiffness change. Test results show that shear strength and stiffness are significantly affected by the confining stress in freezing and shearing phases. This study suggests that the strength and stiffness of frozen soils may be dependent on the confining stresses applied during freezing and shearing.