Study on pull-out mechanical experiment and calculation model of oleander root system

被引：0
|
作者：
Yang G. [1 ]
Li Y. [1 ]
Lin Y. [1 ]
Li Q. [1 ]
Li H. [1 ]
机构：
[1] School of Civil Engineering, Central South University, Changsha
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2023年 / 54卷 / 06期
基金：
中国国家自然科学基金;
关键词：
mechanical model; oleander root system; pull-out force; tensile strength;
D O I：
10.11817/j.issn.1672-7207.2023.06.001
中图分类号：
学科分类号：
摘要：
In situ pulling tests were conducted to determine the whole-plant pulling force of Oleander at 1, 2 and 3 a of age under warm and humid climatic conditions in the upper and middle reaches of the Yangtze River, and to analyze the correlation between pull-out force and growth parameters such as plant height, plant mass, ground diameter and root mass. To investigate the distribution and mechanical properties of the root system, the whole plant excavation method was used to extract intact root systems of oleander at different ages and to count their root mass distribution, and indoor single-root tensile tests were conducted to investigate the relationship between root tensile force and tensile strength and diameter of oleander. Based on the above experimental results, a root-soil composite pullout mechanics model considering the frictional characteristics of root-soil interface was established. The results show that the maximum pull-out force of the intact root system of oleander increases with the increase of the age and is positively correlated with plant height, plant mass, ground diameter and root mass. The tensile strength of the root system of oleander decreases with the increase of the diameter, while the tensile strength increases with the increase of the diameter. The mass of the root system of oleander increases with the increase of the age, but the root mass is concentrated in the burial depth range of [0, 10) cm. The theoretical value of the pull-out force of the root system of the oleander is obtained from the model, which is consistent with the actual value of the pull-out force of the oleander, thus verifying the reasonableness of the model and providing a theoretical reference for the evaluation of the effect of ecological slope protection in practical engineering. © 2023 Central South University of Technology. All rights reserved.
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页码：2085 / 2099
页数：14
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