重塑黄土与植物根系界面摩擦离散元分析

DEM analysis of the remoulded loess and root system interface friction

油松作为一种植根于黄土地区的常见植物,在提高黄土强度方面起重要作用。为了弄清油松根系在黄土地区的固土效应,本文采用离散单元法(Distinct Element Method)模拟根系拉拔试验,分析了法向压力、根系埋深、含水率对根-黄土界面摩擦力学特性的影响。结果表明:拉拔试验中,根-黄土界面峰值强度、残余强度随着法向力的增大而增大;峰值强度、残余强度随着根系埋深的增加而增大;随着含水率的降低,根-黄土界面峰值强度、残余强度呈增大的趋势。

Pinus plays an important role in the reinforcement of loess strength because of its wide distribution in loess area. In order to investigate the fix-soil-effects of Pinus root system in loess area,a series of pull-out tests were carried out using the Distinct Element Method（ DEM）. The effects of normal stress,embedded depth and water content on the frictional mechanism of root-soil interface were analyzed. The results showed that,from the pull-out tests,the peak strength and residual strength of root-loess interface increased with the increases of normal stress and embedded depth,and with the decreases of water content.