Development of Mathematical Model for Pneumatic Tire-Soil Interaction in Layered Soils
GRUMMAN AEROSPACE CORP BETHPAGE NY RESEARCH DEPT
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Mathematical models of tire-soil interaction have been developed for nonhomogeneous soil conditions where the soil strength varies either continuously or discretely with depth. New methods of solving the differential equations of plasticity for soils have been developed for the bearing capacity problem in two-layer soils. Composite slip line fields obtained by these methods and the associated bearing stresses are shown for two cases upper layer stronger than the lower layer and upper layer weaker than the lower layer. An approximate procedure, based on these composite slip line fields, is given for the estimation of bearing stresses in two-layer soils. This approximate procedure is applied in a tire-soil model expanded for the consideration of two- layer soils. The simulation of tire performance by this expanded model is compared with results of small-scale mobility tests performed at the U.S. Army Engineers Waterways Experiment Station WES in layered soils. Field methods of determining soil properties in layered soils are examined, and a modification of ring shear tests is recommended for the determination of the strength of individual layers in layered soils.
- Soil Mechanics
- Surface Transportation and Equipment