琉球大学農学部生物生産学科・生産システム工学講座
Laboratory of Bioproduction Systems Engineering, Department of Biological Production, Faculty of Agriculture, University of the Ryukyus
琉球大学農学部生物生産学科・生産システム工学講座
Laboratory of Bioproduction Systems Engineering, Department of Biological Production, Faculty of Agriculture, University of the Ryukyus
琉球大学農学部生物生産学科・生産システム工学講座
Laboratory of Bioproduction Systems Engineering, Department of Biological Production, Faculty of Agriculture, University of the Ryukyus
We have reported the characteristics of soil deformation beneath a traveling rigid wheel in a shallow sand ground (60mm depth). A variation of deformation with a rotation have been analyzed in 41% slip condition. On the other hand, it would be also important to analyze a deformation of a semi-infinite ground. In this study, we carried out traveling tests of a rigid wheel by using the soil bin with 580mm depth, which could be regarded as a semi-infinite ground, and analyzed soil deformations with 16% and 90% slip conditions. There were two semi-circular zones where large displacement vectors concentrated, which joined at the slightly front of wheel surface to the vertical center line of wheel axle. Normal strains of horizontal direction in a zone directly contacted to the wheel had positive values and zones of both side to it had negative values. In contrast, normal strains of vertical direction in a rear zone and a front zone to the wheel were positive, and a negative zone laid between these zones. Positive shear strains distributed at a rear zone to the wheel, and negative ones at a front zone to the wheel. The boundary line separating both zones located in the slightly front of wheel surface to the vertical center line of the wheel axle. Typical distribution patterns of strains were almost similar in deep and shallow grounds at the neighbor of the wheel.