根系含量对具有粗细根的根-土复合材料剪切强度影响的实验研究

Forests Pub Date : 2024-07-25 DOI:10.3390/f15081306
Jianping Liu, Yusha Tang, Yulin Jiang, Shixin Luo, Kai Wu, Xingxin Peng, Yucong Pan
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引用次数: 0

摘要

目前有关植物护坡的研究主要集中在草本植物和灌木上。为了研究不同根系含量条件下粗细根系根土复合体抗剪强度的差异,选取隐杆线麻(Cryptomeria japonica (Thunb. ex L.f.) D.Don)为研究对象,采用纵剖面法研究了其根系随埋深增加的分布特征。根据实地调查的根面积比分布范围,在四个法向应力水平下,对五个根面积比等级的粗细根根土复合材料样品进行了改良大尺度直接剪切试验,分析了不同根含量下粗细根根土复合材料剪切强度的变化规律。简要讨论了 RAR 的影响机理。结果表明,随着埋藏深度的增加,粗根和细根的抗剪强度先增大后减小,并且随着挖掘点到树干水平距离的增加而减小。粗根和细根都能提高土壤的抗剪强度,但粗根的作用大于细根。粗根和细根根土复合材料的抗剪强度均随 RAR 的增大先增大后减小,这说明对土壤有最佳加固效果的根系存在最佳含量,最佳 RAR 分别为 0.1%和 0.2%。根-土复合材料的粘聚力和内摩擦角可以通过隐杆线虫(Thunb. ex L.f.)D.Don 的根得到改善,粗根的效果优于细根。同时,对内聚力的增强作用大于对内摩擦角的增强作用。这些结果对于了解根对土壤抗剪强度的影响、丰富现有的假山护坡理论具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental Study on the Effect of Root Content on the Shear Strength of Root–Soil Composite with Thick and Fine Roots of Cryptomeria japonica (Thunb. ex L.f.) D.Don
The current research on slope protection with plants mainly focuses on herbs and shrubs. In order to investigate the difference in shear strength of root–soil composite with thick and fine roots under different root content conditions, Cryptomeria japonica (Thunb. ex L.f.) D.Don was selected as the research object, and the distribution characteristics of its roots with the increase of buried depth were studied using the longitudinal profile method. Based on the distribution range of root area ratio (RAR) in field investigation, the modified large-scale direct shear tests were executed on the root–soil composite samples with thick and fine roots of five RAR grades under four normal stress levels, and the variation rule of the shear strength of the root–soil composites with thick and fine roots under different root contents was analyzed. The influence mechanism of RAR was briefly discussed. The results show that the RAR of Cryptomeria japonica (Thunb. ex L.f.) D.Don increases first and then decreases with the increase of buried depth, and decreases with the increase of horizontal distance from the excavation point to the trunk. Both the thick and fine roots can increase the soil shear strength, but the effect of thick roots is greater than that of fine roots. The shear strengths of root–soil composites with thick and fine roots both increase first and then decrease with the increase of RAR, which means that there exists the optimal root content for the roots with the best reinforcement effect on soil, and the optimal RAR is 0.1% and 0.2%, respectively. The cohesive and internal friction angle of the root–soil composite can be improved by the roots of Cryptomeria japonica (Thunb. ex L.f.) D.Don, and the thick root is better than the fine root. Meanwhile, the enhancement effect on the cohesion is greater than that on the internal friction angle. The results are of great significance for understanding the effect of roots on soil shear strength and enriching the existing theory of slope protection with arbors.
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