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http://dx.doi.org/10.7843/kgs.2008.24.2.87

Elastic Wave Characteristics in Cemented Engineered Soils  

Lee, Chang-Ho (Dept. of Civil, Environmental and Architectural Engrg., Korea Univ.)
Yoon, Hyung-Koo (Dept. of Civil, Environmental and Architectural Engrg., Korea Univ.)
Lee, Woo-Jin (Dept. of Civil, Environmental and Architectural Engrg., Korea Univ.)
Lee, Jong-Sub (Dept. of Civil, Environmental and Architectural Engrg., Korea Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.24, no.2, 2008 , pp. 87-97 More about this Journal
Abstract
Behaviors of cemented engineered soils, composed of rigid sand particle and soft rubber particle, are investigated under $K_o$ condition. The uncemented and cemented specimens are prepared with various sand volume fractions to estimate the effect of the cementation in mixtures. The vertical deformation and elastic wave velocities with vertical stress are measured. The bender elements and PZT sensors are used to measure elastic wave velocities. After cementation, the slope of vertical strain shows bilinear and is similar to that of uncemented specimen after decementation. Normalized vertical strains can be divided into capillary force, cementation, and decementation region. The first deflection of the shear wave in near field matches the first arrival of the primary wave. The elastic wave velocities dramatically increase due to cementation hardening under the fixed vertical stress, and are almost identical with additional stress. After decementation, the elastic wave velocities increase with increase in the vertical stress. The effect of cementation hinders the typical rubber-like, sand-like, and transition behaviors observed in uncemented specimens. Different mechanism can be expected in decementation of the rigid-soft particle mixtures due to the sand fraction. a shape change of individual particles in low sand fraction specimens; a fabric change between particles in high sand fraction specimens. This study suggests that behaviors of cemented engineered soils, composed of rigid-soft particles, are distinguished due to the cementation and decementation from those of uncemented specimens.
Keywords
Cementation; Decementation; P-wave; Rigid-soft particle mixtures; 5-wave;
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