Hysteresis of Matric Suction and Capillary Stress in Monodisperse Disk-Shaped Particles
Publication: Journal of Engineering Mechanics
Volume 132, Issue 5
Abstract
The dependences of matric suction and capillary stress on the degree of saturation in monodisperse disk-shaped particles are established for the full range of the degree of saturation. A thermodynamic free energy approach is employed to obtain both the soil–water characteristic curve (SWCC) and the capillary stress characteristic curve (CSCC) for both wetting and drying processes. It is shown that the thermodynamic energy stability concept can lead to the establishment of hysteresis in both the SWCC and CSCC without explicit involvement of the contact angle and ink-bottle hysteresis. The air-entry pressure value and capillary condensation pressure value are quantified and their functional dependencies on the average pore sizes are established. For particle sizes ranging between 0.001 and , the air-entry and capillary condensation pressures decrease from several hundred kPa to several kPa and capillary forces are found to range between tens and hundreds of micronewtons.
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Acknowledgment
DW acknowledges the support of the Research Corporation under the Research Innovation Award #RI-0161.
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© 2006 ASCE.
History
Received: Nov 7, 2003
Accepted: Oct 13, 2004
Published online: May 1, 2006
Published in print: May 2006
Notes
Note. Associate Editor: Jin Y. Ooi
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