根系对边坡土体抗崩解能力影响的试验研究-中南林业科技大学学报.PDF

第35 卷 第5 期 中 南 林 业 科 技 大 学 学 报 Vol. 35 No. 5 2015 年5 月 Journal of Central South University of Forestry Technology May 2015 Doi:10.14067/j .cnki.1673-923x.2015.05.006 http : // 根系对边坡土体抗崩解能力影响的试验研究 肖宏彬，贺 茜，李珍玉，左学龙，陈 能，李 伟 ( 中南林业科技大学，湖南长沙4 10004 ） 摘 要：通过对模型箱根—土的试验研究，探索了混合种植林草的边坡土体的初始含水量、边坡坡度及有效根 密度等对边坡土体抗崩解能力的影响。研究结果表明：边坡土体的抗崩解能力不但与边坡坡度和土体的初始含 水量有关，更与边坡土体中的有效根密度有关；在一定的初始含水量条件下，土体抗崩解能力随着有效根密度 的增大而呈幂函数增长趋势；在此基础上提出了不同初始含水量和不同有效根密度条件下土壤完全崩解所需时 间的计算公式。研究结果为揭示植物根系对边坡稳定性的增强机理提供了理论基础，也对促进生态护坡和植物 边坡的水土保持等技术的发展具有一定的理论及工程应用价值。 关键词：植物边坡；有效根密度；土体抗崩解能力；边坡稳定性 中图分类号：S759.2 文献标志码：A 文章编号：1673-923X(2015)05-0035-04 Experimental study on plant roots effect on anti-disintegration of soil slope XIAO Hong-bin, HE Xi, LI Zhen-yu, ZUO Xue-long, CHEN Neng, LI Wei (Central South University of Forestry and Technology, Changsha 410004, Hunan, China) Abstract: Through an experimental study on root-soil in a model box, the influences of some factors upon anti-disintegration of soil slope were explored, such as initial water content and slope gradient as well as effective roots density etc., when the slope was planted with trees and grasses. The research results show that the anti-disintegration of soil slope was not only related to slope gradient and initial water content, but also was more related to its effective roots density; Under the given initial water content, the anti-disintegration of the soil increased with the increment of its effective roots density, and took an exponentially increasing trend; A computational formula to calculate the time that the soil is completely di