浅层滑坡中乔木直根阻滑效应及变形特性试验研究—前后双根

发布时间：2018-04-14 23:39

本文选题：乔木根系 + 阻滑效应　；参考：《应用力学学报》2017年01期

【摘要】：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。
[Abstract]:The different position of tree root system in soil, its strengthening effect on soil and its own deformation are also different.The large scale direct shear test of Hevea haikou (Arbor) direct root composite was carried out by using a laminated direct shear instrument which can be used to simulate the shallow sliding surface of different depth. The direct shear test was carried out on the straight root of Hevea (Arbor) in Haikou.The reinforcement effect of root system on soil at different depth shear plane and the deformation in the range of root length were obtained.The results show that the root system of Arbor helps to improve the strength of soil and has the ability to prevent or delay the formation of small shallow landslide, and the deformation of root system of Arbor is mainly concentrated between adjacent shear planes, and there is no deformation outside this range.With the shear depth moving down, the root length of the deep stabilized soil layer decreases gradually, and the thrust value of the root soil increases instead of decreasing, the existence of tree root can change the failure curve of soil, and strain hardening occurs.The deformation of the front root in the shear plane is always the largest, the deformation of the front root in the shear plane is smaller than that of the posterior root, and the deformation of the front root in the shear plane and its lower root is greater than that in the rear root.The experimental results show that the root system of Arbor can play a positive role in the stability of the slope and has a tendency to prevent or delay the slide of the slope. The experimental data and conclusions can provide a basis for the anchoring theory of the root system of Arbor in shallow landslide.
【作者单位】：海南大学土木建筑工程学院;中建三局集团有限公司;
【基金】：“十二五”国家科技支撑计划课题(2013BAK05B00) 中西部计划学科建设项目(ZXBJHXK011) 海南省社会发展科技专项项目(SF201456) 海南省科协青年科技英才创新计划项目(201506)
【分类号】：P642.22

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