重塑黄土与植物根系界面摩擦离散元分析

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。

DEM analysis of the remoulded loess and root system interface friction

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.