热带雨林地区乔木树根力学性能试验研究

Experimental research on mechanical properties of the root in tropical-rain-forest area

针对海南地区四类热带乔木树根进行室内抗拉、抗剪力学性能的研究;结合根簇形态特征,对四类树种单根力学性能进行分析。研究结果表明:随着根径增加,四类树种单根抗拉力明显增加,而单根抗拉强度则呈降低趋势;随根径的增加,树根抗剪力逐渐增加,单根抗剪强度则逐渐减小;树根在根系中的生长方向和分布密度对树根的力学性质产生影响,竖直向下生长的主根主要提供抗剪强度及抗拉强度,而与主根簇中主根夹角越大的树种,其侧根所提供的抗剪强度相应越小;结合边坡工程对植被的要求,认为小叶榄仁及凤凰木的各方面力学特征优于同试验的其它树种,表现出更好的工程适用性。

A tensile test and a shear test were conducted for four types of tropical tree roots in Hainan areas, meanwhile, combined with the feature of the root cluster form, the mechanical properties of single root of four types of tree species are analyzed. It is concluded that: Firstly, with the increase of root diameter, the tensile of single root increases, while the tensile strength of single root decreases. Secondly, with the increase of root diameter, the largest shearing of single root increases gradually, while shear strength decreases. Thirdly, the direction and the distribution density of tree roots affect on tree’s mechanical properties, vertically downward taproot mainly provides shear strength and tensile strength. Finally, combined with slope engineering requirement for vegetation, the following conclusions are reached: Comparative to other tree species, Terminalia mantaly and Delonix regia show better mechanics characteristic and engineering applicability than that of other tree species.