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Hysteretic Water Retention Behavior of Two Highly Clayey Expansive Soils
The investigation of hydromechanical behavior of unsaturated expansive soil depends on accurate determination of the hysteretic soil water characteristic curve (SWCC). This research studies the hysteretic characteristic curves of two highly clayey expansive soils initially compacted at optimum moisture content and maximum dry density. Pressure plate tests were performed to obtain the primary drying paths, while a chilled mirror technique-based dewpoint potentiameter (WP4) was used to achieve the primary drying, primary wetting and secondary drying paths. The results were numerically fitted to attain SWCCs based on a popular functional model. Both expansive soils exhibit two stages of hysteresis: the hysteresis between the primary drying and primary wetting curves and between the primary wetting and secondary drying curves. These two stages represent the various degrees of plastic deformation of inter-aggregate macropores and are not related to the elastic volume change of intra-aggregate micropores.
Hysteretic Water Retention Behavior of Two Highly Clayey Expansive Soils
The investigation of hydromechanical behavior of unsaturated expansive soil depends on accurate determination of the hysteretic soil water characteristic curve (SWCC). This research studies the hysteretic characteristic curves of two highly clayey expansive soils initially compacted at optimum moisture content and maximum dry density. Pressure plate tests were performed to obtain the primary drying paths, while a chilled mirror technique-based dewpoint potentiameter (WP4) was used to achieve the primary drying, primary wetting and secondary drying paths. The results were numerically fitted to attain SWCCs based on a popular functional model. Both expansive soils exhibit two stages of hysteresis: the hysteresis between the primary drying and primary wetting curves and between the primary wetting and secondary drying curves. These two stages represent the various degrees of plastic deformation of inter-aggregate macropores and are not related to the elastic volume change of intra-aggregate micropores.
Hysteretic Water Retention Behavior of Two Highly Clayey Expansive Soils
Lin, B. (author) / Cerato, A.B. (author)
GeoCongress 2012 ; 2012 ; Oakland, California, United States
GeoCongress 2012 ; 1205-1212
2012-03-29
Conference paper
Electronic Resource
English
Hysteretic Water Retention Behavior of Two Highly Clayey Expansive Soils
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