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中文摘要：
以沙地柏根系及其土壤所构成的根土复合体为研究对象,通过根土复合体的室内直剪试验,研究了沙地柏根的不同径级、不同布置方式对根土复合体抗剪性能的影响。结果表明,在不同法向应力作用下,有根系存在的根土复合体抗剪强度均明显高于无根扰动土的抗剪强度。在根土复合体中,垂直存在的根系对提高土体抗剪强度的贡献大于水平存在的根系。在所含根数一致的情况下,根土复合体的抗剪强度并不与所含根系径级的大小成正比,而是随着根系径级的增大呈现递增—回落—反弹的趋势。该试验的研究可为今后沙地柏水土保持树种的栽植提供一定的技术参数及理论支撑。
英文摘要：
By taking the composite of the roots of Sabina vulgaris and soil around the roots as a research object,the effects of different root diameter classes and root layouts on shear performance of the root-soil composite were investigated through laboratory shear tests.Results showed that under different normal stresses,shear strength for the root—soil composite with roots was significantly greater than that for the disturbed soil without root.As for the root—soil composite,shear strength contributed by vertical roots was greater than that by horizontal roots.Under the condition of the same number of roots contained,shear strength for the composite was not proportional to the size of root diameter,but presented an increasing—fallback—rebounding trend with the increased root diameter.The study may provide some technical parameters and a theoretical support for the future plantation of Sabina vulgaris as a soil and water conservation measure.
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