000004758 001__ 4758
000004758 005__ 20141119144551.0
000004758 04107 $$aeng
000004758 046__ $$k2002-06-02
000004758 100__ $$aLikos, William J.
000004758 24500 $$aHYSTERESIS OF CAPILLARY COHESION IN UNSATURATED SOILS

000004758 24630 $$n15.$$pProceedings of the 15th ASCE Engineering Mechanics Division Conference
000004758 260__ $$bColumbia University in the City of New York
000004758 506__ $$arestricted
000004758 520__ $$2eng$$aA theoretical analysis is conducted for modeling the constitutive relationships among water content, matric suction, and capillary cohesion in unsaturated granular soils (e.g., sands or silts). A rigorous series of equations is developed to describe the interparticle forces due to negative pore-water pressure for idealized spherical particles in simple-cubic and tetrahedral packing geometries. By considering changing meniscus geometry, matric suction and effective stress are evaluated as functions of water content for soil particles under the pendular (i.e., disconnected) pore-water regime. The contact angle at the interface between the pore-water menisci and the solid soil particles is considered as an arbitrary variable so that its effects on the hysteretic behavior of matric suction, effective stress, and capillary cohesion may be evaluated. The analysis provides a theoretical basis for describing several well-known phenomena in unsaturated soil behavior. Varying the contact angle from 0° to 40° to simulate drying and wetting processes respectively is shown to have an appreciable impact on hysteresis in the constitutive behavior of the modeled soils. The observations from the modeling effort are of practical importance in developing an improved understanding of the behavior of real unsaturated soils undergoing natural wetting and drying processes such as infiltration or drainage. This paper presents partial results of the described research. 

000004758 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000004758 653__ $$ahysteresis, capillary cohesion, unsaturated soils, suction, contact angle

000004758 7112_ $$a15th ASCE Engineering Mechanics Division Conference$$cNew York (US)$$d2002-06-02 / 2002-06-05$$gEM2002
000004758 720__ $$aLikos, William J.$$iLu, Ning
000004758 8560_ $$ffischerc@itam.cas.cz
000004758 8564_ $$s142762$$uhttp://invenio.itam.cas.cz/record/4758/files/288.pdf$$yOriginal version of the author's contribution as presented on CD, .
000004758 962__ $$r4594
000004758 980__ $$aPAPER