A new moisture distribution model for unbound granular materials
(English)In: Geotechnique, ISSN 0016-8505Article in journal (Other academic) Submitted
The presence of waterin the unbound granular materials significantly influences the mechanicalperformance of the material. The ability to estimate the soil watercharacteristic curve (SWCC) is crucial thus to determine the effect themoisture has on the mechanical behaviour of granular materials. In this paper,an analytical moisture distribution model is proposed. A packing theory-based framework to evaluateperformance of unbound granular materials reported previously by the authorsallows identifying the two basic components of the unbound granular materialsskeleton: primary structure (PS) - a range of interactive coarse grain sizes thatforms the main load carrying network in granular materials and secondarystructure (SS) - a range of grain sizes smaller than the PS providing stabilityto the aggregate skeleton. In the new moisture distribution model presented inthis paper, moisture wasconsidered to be stored as meniscus water between SS particles and water thatfilled in small voids.The volume of meniscus water between SS particles and the measured matricsuction values are the two key parameters in the model. In order to validatethe model predicted results are then compared with measuredmatric suction of granite granular materials with different gradations. Theresults showed that the model developed is capable of predicting theexperimentally measured matric suction values for a range of gradations.
soil-water characteristic curve, meniscus water, secondary structure, moisture distribution, matric suction.
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-143484OAI: oai:DiVA.org:kth-143484DiVA: diva2:706688
QS 20142014-03-212014-03-212014-03-24Bibliographically approved