A Consideration of Elasto-Plastic Model for the Composite Soil,
RYUKYUS UNIV NAHA (OKINAWA)
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The soil of fields should be regarded as a composite material for composite soil which contains plants root. By the effect of root, mechanical properties of the composite soil are different from those of usual soil. Then, it may be necessary to estimate and to recognize qualitative and quantitative influences of this difference i.e. roots effect to the trafficability, especially that of low ground contact pressure tractor such as the crawler type. The mechanical properties of composite soil was discussed as a first step to achieve this purpose in this paper. Some experimental results of paddy fields soil as a kind of composite soils showed that the effect of root appeared evidently in the extension and low stress deformation processes. Because plastic deformation also occurred remarkably in these stress states, the composite soil was classified mechanically into the elasto-plastic body. Based on these results, an elasto-plastic model, which was modified one for soil, was introduced and examined qualitatively its behaviours.