油松根系直径对根--土界面摩擦性能的影响  

Effects of root diameter of Pinus tabuliformis on friction characteristics for root-soil interface

作　　者：郑力文[1] 刘小光[2] 余新晓[1] 陈丽华[1] 涂志华[1] 常玉[1] 

机构地区：[1]北京林业大学水土保持学院 [2]上海交通大学船舶海洋与建筑工程学院

出　　处：《北京林业大学学报》2014年第3期90-94,共5页Journal of Beijing Forestry University

基　　金：林业公益性行业科研专项(20130430104);教育部博士点基金项目(20090014110002)

摘　　要：植物根系与土壤界面的摩擦特性对于斜坡的稳定性是一个重要因素。为研究林木根系直径变化对植物根系固土性能的影响,通过对油松单根施加拔出载荷进行室内直接拉拔实验,分析了油松根系直径变化对根--土界面摩擦性能的影响。实验表明,根系--土壤最大摩擦力与根系直径存在明显的线性正相关关系,通过建立单根简化模型对根土间的摩擦情况进行分析,证明与实验结论一致;同时,实验与模型分析得出根土摩擦力与根系的埋置深度也存在线性正相关关系;另外,对影响根系初始拔出载荷的因子进行分析,表明其大小也与根系直径和根系埋置深度呈正相关关系。研究了根系直径生长变化对根--土复合体稳定性的影响机理,对建立边坡稳定模型具有重要参考价值。Tribological properties between plant roots and soil is an important factor for slope stability. In order to evaluate the effects of different root diameters on soil reinforcement by plant roots, the experiment of direct pulling test of single root for Pinus tabuliformis was conducted by implementing pull out load, analyzed the effects of different root diameters on friction performance between tree roots and soil system. The results showed that significant linear correlation between root diameter and root-soil friction was founded. We analyzed the friction between root and soil by the establishment of single simplified model; the results were agreed with the experimental conclusion. Meanwhile, the friction between root and soil was positive linear correlated with root burial depth by the model and experiment. In addition, we analyzed the factors affecting the initial pullout load of root, the positive correlation relationship was also founded between root diameter and root burial depth. This article examines mechanism of the effects between root diameter and root-soil composite stability, which can offer reference value for establishing the model of slope stability.

关 键 词：根系 摩擦特性 根系直径 根系埋置深度 初始拔出载荷 

分 类 号：S714.7[农业科学—林学]