Effects of Acerola and Broad Leaved Tree Roots on Soil Shear Strength and Slope Stability

LI Yun-peng; ZHANG Hui-lan; WANG Yu-jie; WANG Yun-qi; ZHU Jin-qi; LIU Yong

doi:10.13961/j.cnki.stbctb.2014.01.034

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Effects of Acerola and Broad Leaved Tree Roots on Soil Shear Strength and Slope Stability

- Effects of Acerola and Broad Leaved Tree Roots on Soil Shear Strength and Slope Stability
- Bulletin of Soiland Water Conservation Vol. 33, Issue 1, Pages: 40-45(2014)
- 作者机构：
  
  北京林业大学水土保持学院,北京,100083
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2014.01.034
  CLC：
- Published：2014
- 稿件说明：
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LI Yun-peng, ZHANG Hui-lan, WANG Yu-jie, et al. Effects of Acerola and Broad Leaved Tree Roots on Soil Shear Strength and Slope Stability[J]. Bulletin of Soiland Water Conservation, 2014, 33(1): 40-45.
DOI：

LI Yun-peng, ZHANG Hui-lan, WANG Yu-jie, et al. Effects of Acerola and Broad Leaved Tree Roots on Soil Shear Strength and Slope Stability[J]. Bulletin of Soiland Water Conservation, 2014, 33(1): 40-45. DOI： 10.13961/j.cnki.stbctb.2014.01.034.

摘要

重庆缙云山地处三峡库区

是国家重点自然保护区。由于地势特点

坡面极易发生土壤侵蚀及浅层滑坡

因此

在不破坏原有生态环境的前提下

有效防止灾害发生是该地区的重点防治工作。选取了同种根构型的针叶树种(马尾松Pinus massoniana Lamb)和阔叶树种(四川大头茶Gordonia acuminate)

比较其提高土壤抗剪强度的作用强弱

并分析根面积比率、剪切带根系径级比、根系位置范围

以及根系角度等因素对土壤抗剪强度的影响。结果表明

针叶树种对土壤抗剪强度增强效果强于阔叶树种;针叶树种根系平均抗拉强度较大

其对土壤抗剪强度的增量更大;针叶树种根系分布范围较广且存在更多与剪切方向成60°的根系

表现出更好的固坡作用;根面积比率对土壤抗剪强度影响不明显。

Abstract

Located in the Three Gorges Reservoir area

the Jinyun Mountains of Chongqing City is the national natural reserve. Due to the topographic characteristics

soil erosion and shallow landslides are easy to occur on slope. Therefore

effective disaster prevention without destroying original ecological environment is the key control work in this region. Pinus massoniana Lamb as Coniferous species and Gordonia acuminate as broad-leaf species

with the same root architecture

were selected

and their relative effects on the increment of soil shear strength were compared. Effects of crucial factors

e.g.

root area ratio

shear zone root diameter level

spectrum of root position and angle distribution

on the shear strength were further discussed. Results show that the soil reinforcement effect for coniferous species was greater than those for broad-leaf species. The greater averaged tensile strength of coniferous tree led to a larger increment of soil shear strength. The coniferous species

presenting better steadiness on slope

had a larger spectrum of root position distribution and a greater amount of roots at an angle of 60° with shear direction. Effect of the root area ratio to soil shear strength is not notable.

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Keywords

references

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