干旱半干旱区岩质边坡生态基材防护特性与优化配比

为修复干旱半干旱区岩质边坡的生态系统,获得生态护坡基材的优化配比,该文以一种新型生态基材为研究对象,设定组分中的粘结剂、木纤维、保水剂为3个因素,各取3个水平,开展多指标多因素正交试验探索各因素和水平对基材性能的影响规律。结果表明：（1）粘结剂可以有效提升基材的强度和水稳性能,与适量水分作用可以发挥最优效能。随其掺量的增加,抗剪强度表现为先增加后减小,渗透系数和崩解量均表现为减小;（2）施用较少剂量的保水剂即可对基材的渗透、持水性能产生较大的影响,有效提高基材固持自然降水的能力;（3）木纤维与粘结剂的相互作用,可以促进其对基材的加筋补强和改善土壤构型效能的发挥,增强基材的抗冲抗剪性能。除渗透系数随木纤维掺量的增加而增加外,其他指标均呈先增大后减小的趋势。（4）由极差分析可得,各因素对基材性能的影响程度表现为粘结剂＞木纤维＞保水剂,获得基材的最优配比为粘结剂3%左右,木纤维4%左右,保水剂0.1%左右,最优含水率为16%。

Study on protection characteristics and optimal proportion of ecological base material for rock slope in arid and semi-arid region

In order to restore the ecosystem of rock slope in arid and semi-arid region and obtain the optimal proportion for ecological slope protection materials, a new type of ecological base material is investigated in this study. The research focuses on the impact of three factors, namely binder, wood fiber, and water-retaining agent, each with three levels, on the properties of the slope protection material through a multi-index and multi-factor orthogonal experiment. The results show that: (1) The binder can effectively improve the strength and water stability of the material, and its optimal performance can be achieved with an appropriate amount of water. With increasing amounts of the binder, the shear strength shows an increasing-then-decreasing trend, while the permeability coefficient and disintegration amount both decrease. (2) The application of a small amount of water- retaining agent can have a significant impact on the permeability and water-holding capacity of the material, and effectively improve the ability of material to retain natural precipitation. (3) The interaction between wood fiber and binder can promote the reinforcement effect and improve soil configuration, thereby enhancing the material''s impact resistance and shear resistance. Except for the permeability coefficient that increases with the increase of wood fiber content, other indicators show a trend of first increasing and then decreasing. (4) According to the range analysis, the influence degree of each factor on the properties of the base material is binder > wood fiber > water-retaining agent. The optimal proportion is obtained as follows: binder at around 3%, wood fiber at around 4%, water-retaining agent at around 0.1%, and the optimal moisture content is 16%.