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http://dx.doi.org/10.14481/jkges.2017.18.3.5

An Experimental Study of Strength Evaluation in Frozen Soils according to Direct Shear Box Systems  

Kim, Sang Yeob (School of Civil, Environmental, and Architectural Engineering, Korea University)
Kim, YoungSeok (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
Lee, Jangguen (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
Lee, Jong-Sub (School of Civil, Environmental, and Architectural Engineering, Korea University)
Publication Information
Journal of the Korean GEO-environmental Society / v.18, no.3, 2017 , pp. 5-14 More about this Journal
Abstract
Experimental study on strength characteristics of frozen soils is necessary for the safety evaluation of design and construction in cold region. The objective of this study is to evaluate the direct shear strength of frozen soils obtained from traditional system (Type-1), system with roller on the upper shear box (Type-2), and system with fixed upper shear box separated from bottom shear box (Type-3). Specimens mixed with sand, silt, and water are frozen to $-5^{\circ}C$, and then direct shear tests are conducted under the normal stress of 5, 10, 25, and 50 kPa. Experimental results show that the upper shear box of Type-1 touches the bottom shear box due to the rotation of the upper shear box. The shear strength obtained from Type-2 is overestimated because the preventing rotation force is added to shear force. Type-3 may acquire the only strength of the specimen, and shear strain at peak shear strength is similar to that at the beginning of vertical displacement occurrence. In addition, internal friction angle and cohesion at both peak and residual stresses in Type-3 are smaller than those of Type-2. This study shows that high strength specimens including frozen soils can be effectively evaluated using improved shear box system such as Type-3.
Keywords
Cohesion; Direct shear test; Frozen soils; Internal friction angle; Shear box system; Shear strength;
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Times Cited By KSCI : 6  (Citation Analysis)
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