Fundamental Studies on Tillage Machinery (VIII)
Soil Failure Tests under Various Methods of Force Application
1965 Volume 27 Issue 2 Pages 98-104
Details
1965 Volume 27 Issue 2 Pages 98-104
In order to verify the stress theory which the auther reported before, a series of soil failure tests under various methods of force application—compression, tension, torsion and cutting—were conducted. Two micro soil stress meters were buried so that they picked up the summation of two principal stresses in solid cylindrical soil specimen. The applied force, displacement and energy were also measured. Tests were run for three kinds of soil—sandy loam, clay loam and clay. The main results are the followings:
1) The stress theory is qualitatively right.
2) The energy consumption for compressive shear failure is more than 30 timens as large as that of tensile rupture.
The enengy of tensile-tortional failure is several times as much as that of tensile rupture.
3) According to the difference of soil texture, the characteristics of soil failure are varied. For instance, the more clay content, the more the energy requirement for conpressive shear and tensile rupture, Whereas, cutting failure shows a quite contrary tendency.
