基于CT扫描植物根-土复合体直剪试验研究  

Direct shear test of plant root-soil complex based on CT scanning

作　　者：杨钊 黄婧 Yang Zhao;Huang Jing(College of Architectural Engineering,Kaili University,Kaili Guizhou 556011,China)

机构地区：[1]凯里学院建筑工程学院,贵州凯里556011

出　　处：《山西建筑》2024年第9期54-56,65,共4页Shanxi Architecture

基　　金：2022年黔东南州科技计划项目:绿色改良黏土的力学特性及植物适应性研究(黔东南科合J字[2022]64号)。

摘　　要：为探究植物根系对土壤的作用机理,以构树、刺槐、枸杞根为研究对象,通过重塑根-土复合体直剪试验、CT扫描试验,分析了三种植物根系的固土机理。试验结果表明:三种植物根系的存在能够有效地提升土样的抗剪强度与变形能力,其中构树根的增强效果最为显著;较未含根试样含构树根试样内摩擦角提升70.3%,含刺槐根试样黏聚力提升74.8%;根系对土样剪切裂缝的扩展有显著的抑制作用,裂缝的宽度与长度均比未含根试样的小,三种植物中构树根系对土体的加固作用较优。该研究结果为植物根系的固土护坡机理提供理论支撑。In order to explore the mechanism of plant roots on soil,the soil fixation mechanisms of three plant roots were analysed by direct shear test and CT scan test of remodeled root-soil complex.The results showed that the presence of roots of the three plants could effectively improve the shear strength and deformation ability of soil samples,and the enhancement effect of tree roots was the most significant.Compared with the non-rooted sample,the internal friction angle of the tree-containing root sample was increased by 70.3%,and the cohesion of the T-4 sample containing Robinia pseudoacacia root was increased by 74.8%.The root system had a significant inhibitory effect on the propagation of shear cracks in soil samples,and the width and length of cracks were smaller than those of non-root-containing samples.The results of this study provide theoretical support for the mechanism of soil consolidation and slope protection of plant roots.

关 键 词：直剪试验 抗剪强度 根系固土 CT扫描 

分 类 号：TU411.7[建筑科学—岩土工程]