根土复合体的抗剪强度研究

The Research on Shear Strength of Soil-Root Composites

随着我国高速公路、铁路等基础设施的大量建设,工程边坡的生态修复与防护越来越多,含有植物根系的根土复合体力学性质,是决定生态边坡稳定性的重要因素.通过分析含有两种不同根系不同含根量含根土的直接剪切试验,运用Matlab对试验数据进行不同次数的最小二乘拟合分析,得出如下结论:含根土作为一种复合体材料的强度近似符合库仑定理,其抗剪强度τf随着含根量的增加而增大;含根量对内摩擦角的影响与土本身内摩擦角大小有关,本身内摩擦角小的土影响大,而本身内摩擦角大的土影响小,粘聚力则随着含根量的增大而增大.

With the large amount of construction of highways,railways and other infrastructures in China,the ecological restoration projects and the protection of side slope also increase gradually.Mechanical properties of soil-root composites containing plant roots are the key factors which contribute to the stability of ecological side slope.Through analyzing direct shear tests of soil containing two different kinds of roots and by using Matlab to analyze the test data with least squares analysis in different times,the conclusion can be drawn as follows： the shear strength of soil-root composite as a kind of complex material approximately accords with the Coulomb theorem,whose shear strength τf increases with the mounting of root;the impact of root biomass on internal friction angle is relevant to the soil＇s own internal friction angle.The smaller the soil＇s own internal friction angle is,the greater the impact will be,and vice versa,while the cohesion of the soil increases with the mounting of the root.