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http://dx.doi.org/10.7843/kgs.2006.22.4.85

Changes of Undrained Shear Behavior of Sand due to Cementation  

Lee Woo-Jin (Dept. of Civil and Environmental Engrg., Korea Univ.)
Lee Moon-Joo (Dept. of Civil and Environmental Engrg., Korea Univ.)
Choi Sung-Kun (Dept. of Civil and Environmental Engrg., Korea Univ.)
Hong Sung-Jin (Dept. of Civil and Environmental Engrg., Korea Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.22, no.4, 2006 , pp. 85-94 More about this Journal
Abstract
Triaxial tests at isotropic confining pressure of 200 kPa were carried out to show the undrained shear behavior of artificially cemented sands, which were cemented by gypsum, and the influences of relative density and DOC (degree of cementation) were investigated from the results. The yield strength, the elastic secant modulus at yield point and the peak frictional angle of cemented sands increased abruptly compared to uncemented sands, and it was checked that cementation exerts more influence on the behavior of sand than the relative density. But after breakage of the cementation bonds, the relative density was more important factor on the behavior of sand than the cementation. Because the compressibility md the excess pore pressure of cemented sands were reduced due to the cementation bonds, the effective stress path of cemented sands was going toward to the total stress path of uncemented sands. The cementation of sand restricted the dialtion of sand at the pre-yield condition, but induced more dilation in the post-yield condition.
Keywords
Cementation; Compressibility; Degree of cementation; Dilation; Relative density; Undrained shear behavior;
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