Study on the Tensile Mechanical Properties of Sympodial Bamboo Single Root

Abstract

Bamboo plays an important role as a kind of vegetation with contribution to soil and water conservation, Mechanics property of roots play a crucial role in mechanics of soil-reinforcement. In order to find the tension properties of the bamboo roots underground, the tensile experiment for the roots of four kinds of sympodial bamboo, Bambusa distegia, Dendrocalamopsis oldhami, Dendrocalamus giganteus and Chimonocalamus dumosus, was implemented in the field. The experiment employed our own portable experimental equipment for testing tensile characteristics of root. Tensile force and strain rate of roots with different diameters was tested for these four kinds of bamboo. Then, their tensile strength and elastic modulus were obtained through calculation. The experimental results show that the tensile force of sympodial bamboo root increases regularly by the power function regular the increase of the root diameter, and the tensile strength of root reduces along with the increase of root diameter by the power function. The average anti-tension of these four bamboo roots is Bambusa distegia (59.47N), Chimonocalamus dumosus(58.65N), Dendrocalamus giganteus(43.51N) and Dendrocalamopsis oldhami(40.8N), and their average tensile strength is Dendrocalamus giganteus(30.24Mpa), Bambusa distegia(23.14MPa), Dendrocalamopsis oldhami(22.83MPa) and Chimonocalamus dumosus(18.14MPa). The ultimate strain has limitation from 14% to 18%. The average elastic modulus is Dendrocalamus giganteus(169.86MPa), Bambusa distegia(166.37MPa), Dendrocalamopsis oldhami(158.36Mpa) and Chimonocalamus dumosus(135.56MPa). Compared to the four kinds of bamboo, Dendrocalamus giganteus root has the best comprehensive tensile properties. Next are Bambusa Distegia root, Dendrocalamopsis oldhami root, and Chimonocalamus dumosus root respectively. Compared with the common of Pinus tabulaeformis, Betula platyphylla, Larix gmelinii,clumping bamboo roots have better tensile mechanical properties.