Mechanical Properties of Yunnan Pine Root-Soil System and Its Influence on Shallow Slope Stability in Southwestern Mountainous Region of China

Li Yifan; Zhang Guotao; Lei Mingyu; Fang Haiyan; Li Chaoyue

doi:10.13961/j.cnki.stbctb.2022.06.012

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Mechanical Properties of Yunnan Pine Root-Soil System and Its Influence on Shallow Slope Stability in Southwestern Mountainous Region of China

- Mechanical Properties of Yunnan Pine Root-Soil System and Its Influence on Shallow Slope Stability in Southwestern Mountainous Region of China
- Bulletin of Soiland Water Conservation Vol. 42, Issue 6, Pages: 88-96(2022)
- 作者机构：
  
  1. 中国科学院地理科学与资源研究所陆地表层格局与模拟重点实验室,北京,100101
  2. 中国科学院大学资源与环境学院,北京,100049
  3. 中国科学院水利部成都山地灾害与环境研究所山地灾害与地表过程重点实验室,四川,成都,610041
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2022.06.012
  CLC： TU432
- Published：2022
- 稿件说明：
移动端阅览
Li Yifan, Zhang Guotao, Lei Mingyu, et al. Mechanical Properties of Yunnan Pine Root-Soil System and Its Influence on Shallow Slope Stability in Southwestern Mountainous Region of China[J]. Bulletin of Soiland Water Conservation, 2022, 42(6): 88-96.
DOI：

Li Yifan, Zhang Guotao, Lei Mingyu, et al. Mechanical Properties of Yunnan Pine Root-Soil System and Its Influence on Shallow Slope Stability in Southwestern Mountainous Region of China[J]. Bulletin of Soiland Water Conservation, 2022, 42(6): 88-96. DOI： 10.13961/j.cnki.stbctb.2022.06.012.

摘要

[目的] 探究西南山区云南松根土复合体力学特性及其对坡体稳定性的影响，为该区浅层滑坡机理认识，识别预警与防治等提供理论基础与数据支持。 [方法] 以四川省凉山州中研究极为缺乏且与浅层滑坡密切相关的云南松根系为研究对象，开展根土复合体抗剪强度试验和FLAC 3D边坡安全系数数值模拟，探究了不同根系密度、根系分布方式与土壤含水量组合下乔木根土复合体的力学性质及浅层边坡稳定性。 [结果] 较高的植物根系密度可明显提高土体的抗剪强度，与素土相比，黏聚力、内摩擦角提高比例分别高达45.5%，9.6%。然而，根径与根系抗拉强度却呈显著的幂函数负相关关系(p＜0.05)，根径低于2 mm的细根抗拉强度最强；同时，乔木根系水平或垂直分布方式下，土壤含水量的增加均会降低土体的抗剪强度，不利于边坡稳定，而乔木交错分布最有利于提高土壤的抗剪强度和边坡稳定性。 [结论] 乔木根系的高密度发育，复杂交错分布，细根丛生等特点对提高根土复合体抗剪强度与边坡稳定性具有重要作用，适度地增加边坡植被覆盖是控制浅层滑坡发生的重要措施之一。通过评价地质灾害多发区不同条件下乔木根系护土固坡效应，可为震后地质活跃区开展生态修复提供理论支持。

Abstract

[Objective] The mechanical properties of the root-soil system of Yunnan pine and its influence on slope stability in the southwestern mountainous area of China were determined in order to provide a theoretical basis and data support for the understanding

identification

early warning

and prevention of shallow landslides in this area. [Methods] Research regarding the root system of Yunnan pine is extremely lacking as it relates to shallow landslides in Liangshan Prefecture

Sichuan Province. The shear strength test of the root-soil system and FLAC 3D numerical simulation were carried out to explore the mechanical properties of tree-root-soil system and shallow slope stability under different combinations of root density

root distribution

and soil water content. [Results] Higher plant root density could significantly improve soil shear strength. Compared with soil without roots

the cohesion and internal friction angle of soil with roots increased by 45.5% and 9.6%

respectively. However

there was a significant negative power function relationship between root diameter and root tensile strength (p＜0.05)

and the tensile strength of fine roots with diameters less than 2 mm was the strongest. At the same time

under the horizontal or vertical distribution of the root system

an increase in soil water content would reduce the shear strength of the soil

and this situation was not conducive to slope stability. Staggered distribution of trees was most conducive to improving soil shear strength and slope stability. [Conclusion] The characteristics of high density

complex staggered distribution

and clustering of fine roots play an important role in increasing the shear strength of the root-soil system and slope stability. Moderately increasing vegetation coverage is one of the important measures that could be implemented to control the occurrence of shallow landslides. Evaluating the effect of soil protection and slope stabilization provided by tree roots under different conditions in geologically disaster-prone areas could provide theoretical support for ecological restoration in geologically active areas after earthquakes.

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references

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