Surface shear resistance of soils on the micro- to mesoscale
A. Wójciga 1,   K. Bolte 2,   R. Horn 2,   W. Stępniewski 3,   E. Bajuk 3
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Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin, Poland
Institute for Plant Nutrition and Soil Science, Christian-Albrechts-University, Kiel, Germany
Department of Environmental Protection Engineering, Technical University of Lublin, Nadbystrzycka 40, 20-618 Lublin, Poland
Int. Agrophys. 2009, 23(4): 391–398
The effect of soil matric potential, bulk density and organic carbon content on soil shear strength in sandy soils was determined. Relatively new method was applied for measuring surface shear resistance, where sandpaper was adapted as a shear media between soil and vertical load, within top 2 mm of soil. Mohr circles were used to determine shear strength parameters: angle of friction and adhesion. Soil shear resistance increased with increasing content of organic carbon. Air dry state of soil samples resulted in the smallest resistance to shearing in comparison with the range of water content applied. The effect of bulk density on soil shear strength depended on water content and was distinct for higher range of vertical loads.