沙棘根系固土力学特性对其平茬复壮的响应
Response of soil consolidation mechanical properties of Hippophae rhamnoides roots to rejuvenation of mowing
崔天民 1格日乐 1毅勃勒 1查力干1
作者信息
- 1. 内蒙古农业大学沙漠治理学院,呼和浩特 010018
- 折叠
摘要
为考察平茬措施对根系力学特性的影响,以内蒙古干旱半干旱地区水土保持先锋灌木沙棘(Hip-pophae rhamnoides)根系为研究对象,使用TY-8000拉力机,进行单根极限拉伸试验和根土界面拉拔摩阻试验,并分析平茬对沙棘根系固土力学特性的影响.试验结果显示,在测试根径为0～5 mm时,平茬和未平茬条件下,沙棘单根极限抗拉力、抗阻拉力均与直径呈幂函数正相关;单根极限抗拉强度、根-土界面拉拔抗剪强度均与直径呈幂函数负相关.在代表根径级0.5～1.5 mm,沙棘平茬较未平茬平均单根极限抗拉力值提高31%;平均单根极限抗拉强度提高37%;平均拉拔抗剪强度提高30%.研究结果表明,直径对沙棘根系抗拉强度和抗剪强度均有影响,且沙棘经平茬处理后,抗拉特性和抗剪特性均有所提高.
Abstract
A single root ultimate tensile test and a root soil interface pull-out friction test were con-ducted using a TY-8000 tensile machine and the root system of Hippophae rhamnoides,a pioneer shrub for soil and water conservation in the arid and semi-arid areas of Inner Mongolia to investigate the effect of mowing measures on the mechanical properties of roots.The effect of mowing on the soil fixation mechani-cal properties of Hippophae rhamnoides root system was analyzed.The results showed that the ultimate an-ti-tension and resistance tensile force of a single root were positively correlated with the diameter as a pow-er function under the conditions of mowing and non-mowing when the measured root diameter was 0-5.0 mm.The ultimate tensile strength of a single root and the tensile shear strength of the root soil interface were negatively correlated with the diameter as a power function.In the representative root diameter class of Hippophae rhamnoides ranging from 0.5 to 1.5 mm,the average ultimate anti-tension of a single root in mowing was 31%higher than that in non-mowing.The average ultimate tensile strength of a single root in-creased by 37%and the average pull-out shear strength increased by 30%.It is indicated that the diameter has an impact on the strength of tensile and shear of the Hippophae rhamnoides root system,and the prop-erties of tensile and shear have been improved after the mowing treatment.
关键词
沙棘/根系/抗拉/摩阻特性/抗剪强度/平茬/水土保持/生物力学Key words
Hippophae rhamnoides/root system/tensile/friction characteristics/shear strength/mowing/water and soil conservation/biomechanics引用本文复制引用
基金项目
内蒙古自治区自然科学基金(2021MS04011)
国家自然科学基金(41867011)
出版年
2024
NETL
NSTL
维普
万方数据