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 three kinds of monopodial bamboo, Phyllostachys edulis, Pleioblastus amarus and Phyllostachys sulphurea, 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 three kinds of bamboo. Then, their tensile strength and elastic modulus were obtained through calculation. The experimental results show that the tensile force of monopodial bamboo root increases regularly by the power function regulaas 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 three bamboo roots is Phyllostachys edulis(71.96 N), Pleioblastus amarus(62.05 N)and Phyllostachys sulphurea(63.13 N), and their average tensile strength is Phyllostachys edulis(16.46 MPa),Pleioblastus amarus(26.07 MPa)and Phyllostachys sulphurea(19.35 MPa), The ultimate strain has limitation from 13% to 24%. The average elastic modulus is Phyllostachys edulis(67.1 MPa),Pleioblastus amarus(182.03 MPa)and Phyllostachys sulphurea(168.01 MPa). Compared to the three kinds of bamboo, Pleioblastus amarus root has the best comprehensive tensile properties. Next are Phyllostachys sulphurea,and Phyllostachys edulis root respectively. Compared with the common afforestation tree Pinus tabulaeformis, Betula platyphylla,Larix gmelinii, monopodial bamboo roots have better tensile mechanical properties.

Key words: monopodial bamboo, tensile force, tensile strength, strain, elastic modulus