Abstract
Through quick direct shearing test, friction characteristics of root-soil interface between Caragana root and two types of soil, sandy soil and silt soil, is studied. The results show that: shear properties and residual shear properties of root-soil interface between Caragana root and two types of soil are both in the line with the Mohr-coulomb theory. The root-soil interface had significant differences in friction coefficient, cohesion, and residual cohesion between sandy soil and silt soil under the same dry density and same saturation of soil. Silt soil root-soil interface friction coefficient, residual friction coefficient, cohesion and residual cohesion were 1L94%,6.69%,100.98%,46.37% more than that of silt soil. Silt root-soil interface residual friction coefficient and residual cohesion were lower than friction coefficient a1nd cohesion, sandy root-soil interface was opposite.
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