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为探索乔木根系在浅层潜在滑坡中的阻滑效应及变形情况,课题组自行研制了大型根土复合体直剪仪,可模拟不同深度的浅层滑动面。结果表明:根系的存在有助于提高土体的抗剪强度,延缓土体破坏的能力;随着剪切面的下移,根系对土体的强化作用逐渐提高;根系在土中的分布情况会影响到根系对土体的强化作用,根系所在平面与作用力方向垂直时根系的阻滑能力最强;平行根与前后根在土中的变形范围基本相同,变形位移主要集中当前剪切面相邻的剪切面之间;平行根中左右根系在各剪切面处的变形情况基本一致,在当前剪切面处根系的变形位移最大,且当前剪切面之上的根系变形位移要大于下部根系位移;前后根中前根在当前剪切面上的变形位移小于后根,在当前剪切面及其下前根的变形位移要大于后根。该研究成果为拓展乔木根系对浅层边坡的治理提供了试验依据,对乔木的固土护坡作用研究具有积极意义。
In order to explore the anti-slip effect and deformation of arbor root in the shallow potential landslide, the research group developed a large-scale root-soil composite direct shear device to simulate the shallow sliding surface with different depths. The results showed that: the existence of root system helps to improve the shear strength of soil and delay the ability of soil destruction; With the downward movement of shear surface, the strengthening effect of root system on soil gradually increased; The distribution of root system in soil Which will affect the strengthening effect of the root system on the soil. When the root system is perpendicular to the direction of the acting force, the root system has the strongest resistance to skidding. The deformation range of the parallel root and the anteroposterior root in the soil is basically the same, and the deformation and displacement mainly concentrate on the current shear surface The deformations of the left and right root systems in the parallel roots are basically the same at each shear surface. The deformation displacement of the root system is the largest at the current shear surface, and the displacement of the root system above the current shear surface is Which is larger than the displacement of the lower root system. The deformation displacement of the anterior root in the anterior and posterior roots is smaller than the posterior root in the current shear surface, and the deformation displacement in the current shear surface and its anterior root is greater than that in the posterior root. The research results provide the experimental basis for expanding the treatment of shallow slope by the tree roots, and have positive significance for the research on the role of arbors in slope protection.