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中文摘要：
采用应变控制式直剪仪,通过对含不同沙地柏根系径级的扰动土进行室内直剪试验,分析研究根土复合体的抗剪性能。结果表明沙地柏根系的加入,增强了土体的抗剪强度,且根土复合体的抗剪强度符合库伦定律;当所含根系径级小于某个极限值时,根土复合体的抗剪强度随着径级的增大而增大,当超过这一极限值,则随着所含根系径级的增大,其抗剪强度逐渐减小,随着根系径级的逐步增大,由于根自身抵抗土体剪切变形能力增强,使得根土复合体的抗剪强度值开始回升;一定竖向荷载下,根土截面比△过小,对复合体抗剪性能影响微弱;根土截面比过大,根系与土壤胶结力降低,对抗剪强度产生负影响,因此,存在一个最佳根土截面比,在此比值附近,根土复合体的抗剪强度达到最大。本研究可为沙地柏在作为水土保持树种栽植方面提供理论依据。
英文摘要：
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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