云南省昭通市烂泥箐滑坡源区草本植物根系抗拉特征

徐宗恒; 陈云英; 张宇; 查玲珑; 陶真鹏

doi:10.13961/j.cnki.stbctb.2023.03.002

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云南省昭通市烂泥箐滑坡源区草本植物根系抗拉特征

试验研究

- 云南省昭通市烂泥箐滑坡源区草本植物根系抗拉特征
- Root Tensile Characteristics of Herbaceous Plants from Source Areas of Lanniqing Landslide in Zhaotong City, Yunnan Province
- 水土保持通报 2023年43卷第3期页码：11-18
- 作者机构：
  
  云南师范大学地理学部, 云南省高原地理过程与环境变化重点实验室,云南,昆明,650500
- 作者简介：
- 基金信息：
  
  国家自然科学基金项目“典型斜坡非饱和带优先域及其降雨入渗机制研究”(41502340);云南省科技厅应用基础研究面上项目“植被参与条件下斜坡非饱和土水理—力学特征：试验及机理”(202101AT070138)
- DOI：10.13961/j.cnki.stbctb.2023.03.002
  中图分类号： Q948.1;S718.3
- 纸质出版：2023
- 稿件说明：
移动端阅览
徐宗恒, 陈云英, 张宇, 等. 云南省昭通市烂泥箐滑坡源区草本植物根系抗拉特征[J]. 水土保持通报, 2023,43(3):11-18.

Xu Zongheng, Chen Yunying, Zhang Yu, et al. Root Tensile Characteristics of Herbaceous Plants from Source Areas of Lanniqing Landslide in Zhaotong City, Yunnan Province[J]. Bulletin of Soiland Water Conservation, 2023, 43(3): 11-18.
徐宗恒, 陈云英, 张宇, 等. 云南省昭通市烂泥箐滑坡源区草本植物根系抗拉特征[J]. 水土保持通报, 2023,43(3):11-18. DOI： 10.13961/j.cnki.stbctb.2023.03.002.

Xu Zongheng, Chen Yunying, Zhang Yu, et al. Root Tensile Characteristics of Herbaceous Plants from Source Areas of Lanniqing Landslide in Zhaotong City, Yunnan Province[J]. Bulletin of Soiland Water Conservation, 2023, 43(3): 11-18. DOI： 10.13961/j.cnki.stbctb.2023.03.002.

摘要

[目的] 研究植物根系的抗拉强度特征，了解根系在复合体中的表现，为开展生态护坡时植物的选择提供依据。[方法] 对取自于云南省昭通市烂泥箐滑坡滑源区的鸢尾和艾根系开展单根拉伸试验，从宏观破坏特征，变形—拉力曲线以及断裂拉力、最大抗拉力、抗拉强度、延伸率和拉伸模量等参数揭示两者变形破坏特征和抗拉特征。[结果] ①鸢尾根系破坏具有明显延性，而艾根系呈现脆性破坏特征；破坏时前者的平均延伸率约是后者的3倍。鸢尾根系在拉伸过程表现出较好弹塑性变形特征和较强的变形能力。②由于周皮组织的保护作用，鸢尾根系变形—拉力曲线多呈现波动多峰值型，而艾根系主要呈现近似直线型。③根径和根系长度明显影响着根系抗拉特征，根系的断裂拉力和最大抗拉力、抗拉强度和拉伸模量随根径增加而呈现增加或减小的变化特点，待测根系长度较短会导致抗拉特征参数变异程度增强。所以建议选择根径沿轴向变化不大，尽量长的根系开展相关力学试验。[结论] 建议选择根组织结构好，周皮组织厚，变形能力强，延伸率大且具有明显延性破坏特征的植物作为草本护坡植物。

Abstract

[Objective] The tensile strength characteristics of plant roots were studied to understand the performance of roots in complexes

in order to provide a basis for the selection of plants to be used in ecological slope protection.[Methods] Single root tensile tests were carried out on the roots of Iris tectorummaxim and Artemisia argyi taken from the source areas of the Lanniqing Landslide in Zhaotong City

Yunnan Province. The deformation and failure characteristics and tensile strength features were determined from macroscopic failure characteristics

deformation-tension curve

and feature parameters of fracture tension

maximum tension force

tensile strength

elongation rate

and tensile modulus.[Results] ① Iris root damage showed obvious ductility

while A. argyi root damage showed brittleness. The average elongation rate of I. tectorummaxim was about three times of A. argyi when damaged

and the root system of I. tectorummaxim showed good elastic-plastic deformation characteristics and strong deformation ability in the tensile process. ② Due to the protective effect of the periderm

the deformation-tension curves of Iris tectorummaxim roots mostly showed fluctuation and multiple peak values

while the roots of A. argyi mainly showed an approximately linear response. ③ Diameter and length significantly affected the mechanical features and parameters of roots. Fracture tension and maximum tension force increased with increasing root diameter

while tensile strength and tensile modulus decreased. The variation of the characteristic parameters of tensile strength was enhanced when the root length was short. Therefore

it is recommended that plants be selected that have little change in root diameter along the axial direction and the roots be as long as possible when carrying out relevant mechanical tests.[Conclusion] We recommend selecting vegetation with good root tissue structure

thick periderm tissue

strong deformation ability

large elongation rate

and obvious ductile failure characteristics to be used as slope protection plants.

关键词

Keywords

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