Analysis of the Influence of Root Water Absorption on the Stability of Unsaturated Soils Slope

ZHONG Caiyin; CUI Peng; ZHU Shuairun; QING Yiwei; WU Lizhou

doi:10.13870/j.cnki.stbcxb.2022.02.013

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Analysis of the Influence of Root Water Absorption on the Stability of Unsaturated Soils Slope

更新时间：2024-11-07

- Analysis of the Influence of Root Water Absorption on the Stability of Unsaturated Soils Slope
- Vol. 36, Issue 2, Pages: 99-105(2022)
- 作者机构：
  
  1. 成都理工大学环境与土木工程学院,成都,610059
  2. 中国科学院成都山地灾害与环境研究所,成都,610054
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2022.02.013
  CLC： TU411.7
- Published：2022
- 稿件说明：
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ZHONG Caiyin, CUI Peng, ZHU Shuairun, et al. Analysis of the Influence of Root Water Absorption on the Stability of Unsaturated Soils Slope[J]. 2022, 36(2): 99-105.
DOI：

ZHONG Caiyin, CUI Peng, ZHU Shuairun, et al. Analysis of the Influence of Root Water Absorption on the Stability of Unsaturated Soils Slope[J]. 2022, 36(2): 99-105. DOI： 10.13870/j.cnki.stbcxb.2022.02.013.

摘要

为了量化植物根系吸水对非饱和土边坡稳定性的影响及为植被护坡的植物种类选择提供参考

采用COMSOL Multiphysics建立二维边坡

模拟不同根系形态、根长及降雨条件下的根系吸水引起的非饱和土边坡孔隙水压力的分布变化

并采用极限平衡理论对边坡稳定系数进行定量计算。结果表明:指数形根系吸水产生的吸力最大

比裸坡增大4.2倍

抛物线形根系吸水产生的吸力最小

但仍比裸坡增大2.7倍;根系越长吸水影响深度越大;根系越短

产生的吸力越大

且吸力在边坡表面的变化越显著;短期降雨后

含根系边坡吸力比裸坡高12~20 kPa;指数形根系对非饱和土边坡稳定性提高贡献最大

比裸坡提高1.54倍

抛物线形最小

但仍比裸坡稳定性提高1.36倍。根系吸水对非饱和土边坡的稳定性提高有积极作用

在采用植被护坡的方式时

应优先考虑指数形根系的植被。

Abstract

To quantify the influence of root water absorption on unsaturated soils slope stability and provide reference for plant species selection of vegetation slope protection

a two-dimensional slope was established by COMSOL Multiphysics. The distribution of pore-water pressure in unsaturated soils slope caused by root water absorption under different root morphology

root length and rainfall conditions was simulated

and the slope stability factor was quantitatively calculated using the limit equilibrium method. Results demonstrated that the suction generated by the exponential root uptake water is the largest

which is 4.2 times larger than that of the bare slope

and the suction generated by the parabolic root uptake water is the smallest

which is still 2.7 times larger than that of the bare slope. The longer the root was

the greater the influential depth of water uptake was. The shorter the root was

the greater the suction generated

and the more remarkable the change of suction on the slope surface. After short-term rainfall

the suction of root soil slope was still 12~20 kPa higher than that of bare slope. The exponential root system contributed more to the stability improvement of unsaturated soils slope

which was 1.54 times higher than that of bare slope. While the parabolic root system was the smallest

but it was still 1.36 times higher than that of bare slope. The root water absorption has a positive effect on the stability of the unsaturated soils slope. For vegetation slope protection

priority will be give to the vegetation with the exponential root.

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Keywords

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