不同土层深度油松根系拉力学特性

Pinus tabulaeformis,as one of water and soil conservation pioneer species,the tensile mechanical property of its roots will play an important role in slope stability．In order to explore the different soil depth root tensile mechanical properties,different depth of the single tensile experiment was carried out．Results showed that tensile resistance of Pinus tabulaeformis increased with diameter increasing. The average tensile resistance sequence is T2>T1>T3>T4. The relationship between the tensile resistance and diameter was power function, the fitting equation was y = 9.631x1.978（R2=0.949）.The trend of tensile strength was inconsistent with the diameter increasing. The average tensile strength sequence was T2>T1>T3>T4,there was no significant correlation between the tensile strength and the diameter .The root stress-strain curve parameters were different in different curves, the quadratic polynomial model to describe its stress-strain response is very reasonable .All of them showed the single-peak curves with elastic-plastic material characteristics. Ultimate stress and ultimate elongation were affected by the soil depth, had no significant correlation with their diameters .Soil depth have a significant affect on the the Pinus tabulaeformis root tensile mechanical properties, but its mechanism needs to be further investigated.