摘要
运用工程力学基本理论和土力学试验方法 ,剖析植物根系在增强松软饱和滩涂土壤抗剪强度中的作用机理 .由花米草土壤 根系复合体原型结构试样直剪试验得知 :复合体抗剪强度τ与法向正压力σ的关系符合库仑定律 ,且τ随含根量Mr 的增加而提高 .并提出土壤中草根的作用与钢筋混凝土结构中的钢筋类似 ,参照钢筋混凝土结构抗剪承载力公式 ,总结出复合体单位面积上的受剪承载力与含根量之间的关系公式为τ =τo+ 0 .14Mrfr,公式表明根系与土壤之间的摩擦力和凝聚力会提高土壤的抗剪强度 。
Applying the basic theory of engineering mechanics and experimental method of soil mechanics, the effect of grass roots on shear strength was measured. According to the model tests, the direct shear strength of SRC can be described by Coulomb equation. The shear strength of SRC increased with the amount of roots. Presuming that the action of roots in soil is similar that of steel bars in concrete, and proposed using the formula for reinforced concrete to calculate the relations formula of SRC shear strength and the amount of root i.e. τ=τ o+0.14 M r f r. The formula showed that the friction force and anchorage stress can prevent the soil from being sheared. The roots can raise the strength of the soil, and contribute to support and advance of the machine.
出处
《华南农业大学学报》
CAS
CSCD
北大核心
2000年第4期78-80,共3页
Journal of South China Agricultural University
基金
国家自然科学基金资助项目! (5 9475 0 2 5 )
广东省自然科学基金资助项目! (96 0 45 7)
关键词
土壤-根系复合体
抗剪强度
滩涂机械行走机构
soil root composite(SRC)
shear strength
anti tensile strength
root amount
reinforced concrete
