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乔木根系在土中所处位置不同,其对土体的强化作用以及自身的变形情况也就不同。通过自行研制的可用于模拟不同深度浅层滑动面的层叠式根土复合体直剪仪对海口橡胶树(乔木)直根进行了根土复合体大型直剪试验,得到了不同深度剪切面处根系对土体的强化效果以及根系通长范围内的变形情况。试验结果表明:乔木根系的存在有助于提高土体的强度和具备阻止或延缓小型浅层滑坡产生的能力;乔木根系的变形主要集中在相邻剪切面之间,此范围之外基本无变形;随着剪切深度的下移,深入稳定土层的根系长度则逐步减少,含根土所能承受的推力值不降反升;树根的存在可改变土体的破坏曲线形式,出现应变硬化现象;前后根系在土中的变形并不一致,剪切面处前根的变形始终最大,剪切面之上前根变形小于后根,剪切面及其之下前根变形大于后根。试验结果得出,乔木根系可对边坡的稳定性起到积极作用,有阻止或延缓边坡下滑的趋势,其试验数据及结论可为乔木根系在浅层滑坡中的锚固理论提供依据。
Tree roots in the soil at different locations, the strengthening of the soil as well as their own deformation is different. Large-scale direct shear test of root-soil composite roots of rubber tree (tree) in Haikou was carried out through the self-developed laminated shear root shear instrument which can simulate the shallow sliding surface at different depths. Root reinforcement effect on the soil and root deformation within the long-range deformation. The results show that: the existence of arbor root system can help to improve soil strength and have the ability to prevent or delay the production of small shallow landslides; the distortion of arbor root system is mainly concentrated between adjacent shear planes, and basically no The root length of soil layer gradually decreases with the decrease of shear depth, and the thrust value of root soil can not fall or rise; the existence of tree roots can change the form of soil damage curve, Strain hardening; Before and after the root deformation in the soil is inconsistent, the deformation of the anterior root at the shear surface is always the largest, the deformation of the anterior root is less than that of the posterior root, the deformation of the anterior root is greater than that of the posterior root . The experimental results show that the arbor can play a positive role in the stability of the slope, which has the tendency of preventing or slowing down the slope. The experimental data and conclusions can provide the basis for the anchoring theory of the arbor in the shallow landslide.