雨林乔木直根根土复合体的抗剪强度试验研究

Experiment research on rainforest trees tap root resistance slide effect in the shallow landslide

为探索不同类型的雨林乔木直根根土复合体的抗剪强度,采用自行设计加工的大型根土复合体直剪仪对不同根径、根数以及根系分布条件下的根土复合体进行直剪试验。通过电动汽车千斤顶,对上剪切盒匀速缓慢施加推力,试验过程中实时记录千斤顶推力的大小、直根相对剪切盒的位移及剪切盒位移等。试验结果显示:土中根系的分布类型、根径大小、根数和剪切深度会影响到根土复合体的抗剪强度及相应的强度指标;植被根系对土体的加筋作用具有积极作用,为后续更加深入地研究乔木根系对小型边坡的治理奠定试验基础。

In order to explore the shear strength of the different types of rainforest tree straight roots and soil composite, the research group adapted direct shear tests on shear planes with different the number of root, root diameter and root distribution by designed large complex root-soil direct shear apparatus. Through the electric automotive jack, to push against the upper shear box at a constant speed, in the process of the test always keep a record of the date： jack thrust size, the relative displacement of straight root and shear box, displacement of shear box and so on. Experimental results show that the distribution types of root, root diameter, the number of root and shear depth can effect the shear strength and the shear strength index of the root-soil composite： the root of vegetation has a positive effect on the reinforcement of soil, The trail lays a foundation for more in-depth research of subsequent tree roots of small landslide governance.