摘要
[目的]探究不同影响因素下紫穗槐根—土界面拉拔摩阻特性的变化规律,为研究区栽培植物种的选择提供理论依据。[方法]通过室内拉拔试验研究有无须根、根径、拉拔速率对紫穗槐根—土复合体最大拉拔力、拉拔摩阻强度、根土界面摩擦系数的影响。[结果]紫穗槐直根带须根—土复合体和直根—土复合体拉拔过程中的拉拔力—时间曲线以及拉拔力—位移曲线基本一致,但同径级紫穗槐直根带须根—土复合体的最大拉拔力、根土界面摩擦系数、拉拔摩阻强度较直根—土复合体均提高了1.3倍,须根明显提高了根段的固土性能。随根径增大,紫穗槐直根—土复合体的最大拉拔力、拉拔摩阻强度、根土界面摩擦系数呈指数正相关;随拉拔速率增大,紫穗槐直根—土复合体的根土界面摩擦系数、拉拔摩阻强度均呈增大趋势,即500 mm/min(0.74,40.11 kPa)>10 mm/min(0.65,35.58 kPa)。冗余分析表明根径、有无须根、拉拔速率与紫穗槐根—土界面拉拔摩阻特性指标均呈显著相关关系,其中贡献率最高的是根径(55.4%),其次是有无须根(23.7%),第三是拉拔速率(20.9%)。[结论]紫穗槐具有较强的固土性能,在承受大风拉拔、径流冲刷等荷载时能发挥其固土作用。
[Objective]This study aims to investigate the variation of pullout friction characteristics of root-soil interface of Amorpha fruticosa under different influencing factors,and to provide a theoretical basis for the selection of cultivated plant species in the study area.[Methods]The influence of fibrous roots,root diameter,and pulling rate on the maximum pulling force and friction resistance of A.fruticosa root-soil composite,as well as the friction coefficient in the A.fruticosa root-soil interface were investigated through indoor tensile testing.[Results]The curve between pulling force and time,pulling force and displacement of root-soil composite with or without firbrous root were basically the same.However,the maximum pulling force,root-soil friction coefficient,and friction resistance of the fibrous root-soil composite were 1.3 times higher than tap root-soil composite in the same root diameter.In tap root-soil composite,the root diameter was exponentially correlated with the maximum pulling force,pulling friction coefficient,and root-soil friction coefficient.With the increase of pulling rate,root-soil friction coefficient,and pulling friction coefficient showed an increasing trend in which values under the pulling rate of 500 mm/min(14.06 N,0.74,40.11 kPa)was larger than 10 mm/min(12.04 N,0.65,35.58 kPa).The redundancy analysis showed that root diameter,presence or absence of fibrous roots,and pulling rate were significantly correlated with the interfacial root-soil friction.Contribution rates from root diameter,fibrous roots,and pulling rate were 55.4%,23.7%,and 20.9%,respectively.[Conclusion]A.fruticosa showed strong soil conservation capacity and will play its role when subjected to the pulling force loads from high wind and runoff.
作者
袁亚楠
李诗文
胡晶华
肖巍
王博
郑欣如
刘静
Yuan Yanan;Li Shiwen;Hu Jinghua;Xiao Wei;Wang Bo;Zheng Xinru;Liu Jing(College of Desert Control Science and Engineering,Inner Mongolia Agricultural University,Huhhot 010019,China;Zhongkan Metallurgical Geotechnical Investigation Design and Research Institute Co.,Ltd.,Urumqi 830000,China;College of Geography Science,Inner Mongolia Normal University,Hohhot 010010,China)
出处
《水土保持研究》
CSCD
北大核心
2024年第1期207-213,共7页
Research of Soil and Water Conservation
基金
内蒙科技计划项目“呼包鄂榆生态功能区发挥根系持续固土力学特性的精准植被建设技术研究”(201802107)。
关键词
根系
根—土复合体
拉拔试验
摩阻特性
root
root-soil composite
pulling force test
friction resistance characteristics
