The Effect of Root Diameter of Sabinavulugaris on the Shear Strength in Root-Soil Composites
In this paper, using t he direct shear apparatus, the shear strength of soil-root composites containing different diameter roots of Sabinavulugaris was researched. The results showed that the colonization of Sabinavulugaris roots increased soil shear strength and shear strength of soil-root composites accorded with Coulomb＇s law. As the diameter of root contained was lower than a threshold, the shear strength of soil-root composites increased as the diameter increased. When over the limit, the shear strength of soil-root composites decreased as the diameter increased. With the gradual increase of root diameter, the resistance capacity of root to the shear increased and made the shear strength values of soil-root composites begin to rise. Under certain vertical load, if the root soil cross-section ratio is too small, the root influenced Shear strength of composites weakly; if the root soil section ratio was too large, the cement between root and soil was reduced, and roots had a negative influence on the shear strength. Therefore, there was an optimum soil root cross-section ratio, and when the root soil cross-section ratio, was near to the optimum value, the shear strength of the root soil composite reached to the maximum. This study could provide a theoretical basis for Sabinavulugaris plantation in the soil and water conservation areas.
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万方数据
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