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Compression Behavior of Unsaturated Clay under High Stresses
This paper focuses on preliminary characterization of the compression behavior of unsaturated compacted clay under high stresses (up to 55 MPa) and different drainage conditions. The motivation for this work is to provide calibration data to define parameters needed to simulate the reaction of compacted soil to a buried explosive. The impact of suction on the shape of the compression curve (i.e., the preconsolidation stress and the slope of the virgin compression curve) was investigated through a series of small-diameter drained oedometer tests. Suction values at the beginning of oedometer testing ranged from 39 kPa to 164 MPa and were applied using the vapor equilibrium technique. Application of suction caused a reduction in the initial void ratio from 0.51 to 0.37, and suction was observed to affect the apparent preconsolidation stress (suction-induced hardening). The impact of drainage conditions on the compression behavior of the same unsaturated soil under stresses up to 55 MPa was also investigated using a high-pressure true triaxial device. As expected, the compacted clay was much stiffer during undrained loading, although deformations were noted due to compression of the air-filled voids until reaching pressure saturation.
Compression Behavior of Unsaturated Clay under High Stresses
This paper focuses on preliminary characterization of the compression behavior of unsaturated compacted clay under high stresses (up to 55 MPa) and different drainage conditions. The motivation for this work is to provide calibration data to define parameters needed to simulate the reaction of compacted soil to a buried explosive. The impact of suction on the shape of the compression curve (i.e., the preconsolidation stress and the slope of the virgin compression curve) was investigated through a series of small-diameter drained oedometer tests. Suction values at the beginning of oedometer testing ranged from 39 kPa to 164 MPa and were applied using the vapor equilibrium technique. Application of suction caused a reduction in the initial void ratio from 0.51 to 0.37, and suction was observed to affect the apparent preconsolidation stress (suction-induced hardening). The impact of drainage conditions on the compression behavior of the same unsaturated soil under stresses up to 55 MPa was also investigated using a high-pressure true triaxial device. As expected, the compacted clay was much stiffer during undrained loading, although deformations were noted due to compression of the air-filled voids until reaching pressure saturation.
Compression Behavior of Unsaturated Clay under High Stresses
Mun, W. (Autor:in) / McCartney, John S. (Autor:in)
Geo-Congress 2014 ; 2014 ; Atlanta, Georgia
Geo-Congress 2014 Technical Papers ; 1443-1452
24.02.2014
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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