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。
英文摘要:
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.