Similitude Study of Soil-Machine Systems (II)
Similitude of Rectangular Blade in Sandy Loam
1971 Volume 33 Issue 2 Pages 105-111
Details
1971 Volume 33 Issue 2 Pages 105-111
1. Similitude tests on the draft of rectangular blades were performed in the sandy loam shown in Fig. 1 and Tab. 3. Penetrating resistance to a circular plate (48mmφ): R (kg/cm2) and the draft of soil strength feeler plate: S (kg/cm2) were adopted as the pertinent variables of soil strength in addition to soil density.
2. Distortions were present in case of soil D, E, F and G (Fig. 2 (b)). It is seemed that the occurrence of distortion and its degree are closely connected with the cohesion of soils as pointed out in many other studies.
3. Neglect of acceleration of gravity was effective to handle the distortion (Fig. 6. 7).
4. Regression analysis was done in investigating the relations between prediction factor δ and scale length n or distortion factor αR or αS for the three levels of ∏2. As the results of the analysis, it was generally evident that prediction factor δ is in close connection with scale factor n more than distortion factor αS. And αR is inadequate for obtaining the accurate prediction factor.
5. Regression equations concerning with δ and n, αS and αR were shown as the exponent functions but any definite relations could not be found between the exponents and the soil properties.
