生态护坡中桉树根系的固土效果试验研究

Study on the effect of holding soil by eucalyptus roots in ecology slope protection

目的研究生态护坡中植物根系在土体中的加固方法和原理。方法通过土样的含水量测定试验、直剪试验和现场抗拉试验,建立了桉树林地土壤含水量与抗剪强度指标以及根系直径与根系最大抗拉强度和最大抗拉力之间的关系。结果土体抗剪强度参数值均随着土壤含水量的增加而减小,根系最大抗拉强度随着根系直径的增加呈现增加的趋势,最大抗拉力随着根系直径的增加呈现出减小的趋势,而植被根系的最大抗拉拔力与根土之间的静摩擦系数、根的直径、埋深和根周围土体的重度有关。结论根系最大抗拉强度与根系直径两者之间符合指数函数关系,最大抗拉力与根系直径两者之间符合正相关关系,植被根系越粗埋深越大,周围土体越密实则其最大抗拉力就越大。

Objective--To study the method and theory of holding soil through plant roots in ecology slope protection. Methods--Through the water content determination test of soil sample, direct shear tests and on-site tensile testing of eucalyptus roots, the relationships between water content and parameter valuation of shear strength, between the diameter of root system and the maximum tensile strength and between the diameter of root system and the maximum tensile force are established. Resuits--The parameter valuation of shear strength of the soil decreases with the increase of water content; the maximum tensile strength increases with the increase of the diameter of root system; the maximum tensile force decreases with the increase of the diameter of root system; The maximum antidrawing force of vegetation root system have a relationship with the static friction coefficient between root system and its ambient soil, root diameter, depth and soil bulk density. Conclusion--The maximum tensile strength and the diameter of root system conform an exponential relationship while the maximum tensile strength and the diameter of root system have positive correlation; The bigger and deeper a root system is, the deeper burial depth is; the closer the contact with soil is, the bigger the maximum tensile force is.