湿田への動力耕耘機の導入に関する研究 (第3報)
車輪の沈下による土の変形について
1958 年 19 巻 4 号 p. 133-137
詳細
1958 年 19 巻 4 号 p. 133-137
The results of the soil deformations, when the tractor wheel passes on the field soil, were obtained by the experiments used the cylindrical loads like the road roller in the glass box.
(1) When we plot the relations of the sinking degree against the loads on the graph sheet, the curves become the parabola, and that streight lines on the log-log paper have the inclinations decided by the moisture percentage in the soil. When the soil has little moisture, the sinking degree per unit load decreases with the load increasing.
(2) When the cylindrical loads are charged on the compressible soil the soil particles under the cylinder moves for the direction of the load, and the soil detached from the vertical center line of the cylinder moves for the fan shaped direction.
(3) But, after these soil particles are all compacted, the uncontinuous line, named slip line, springs up in the soil.
(4) As the soil contain the more water, the compressibility of the soil decreases and the soil has the fluidity. Then each point in the soil moved along the slip line above mentioned.
(5) In general the soil particles charged the cylindrical loads on it, move along the certain line decided by it's nature. It is supposed that the shape of the curve of the slip line are the characteristic curves of the differential equation of the soil deformation.
