Study On Mechanical Characteristics Of Four Common Arbor Root Systems In North China
By selecting four common kinds of arbor root system, Pinus tabulaeformis, Betula platyphylla, Quercus mongolica and Larix gmelinii, the mechanical characteristics of root system are investigated using a gauge length of 50mm by performing tensile experiments. The results show that the tensile strength of arbor roots has a negative correlation with root diameter and that they are in a power function relationship. The tensile resistance of the root system has a positive correlation with root diameter, and they also present a relationship of power function. Under conditions of same root diameter, the tensile resistance of Betula platyphylla is the largest, followed by Quercus mongolica, then Pinus tabulaeformis,and lastly Larix gmelinii. Under the same diameter conditions, Betula platyphylla and Quercus mongolica have the maximum tensile strength and Pinus tabulaeformis has the minimum tensile strength. Analysis of the stress-strain curves of the root system indicates that the strain increases linearly with increasing stress in the case of smaller diameter roots, and they have a good linear elastic relationship. However, the stress-strain curves increase slowly, with no apparent linear range, with increasing diameters. For the four kinds of arbor roots, the study exhibits that Larix gmelinii shows the most obvious linear elasticity, while the linear elasticity of Quercus mongolica shows the smallest. With increasing diameter, the tensile strength, critical strain and elastic modulus of the four kinds of arbor roots decreases accordingly.
arbor root system tensile strength stress-strain curve elastic modulus mechanical characteristics
ZHOU Shuo CHEN Li-hua WANG Ping-hua ZHAO Hong-hua JI Xiao-dong
Key Laboratory of Soil and Water Conservation & Desertification Combat of Ministry of Education, School of Water and Soil Conservation,Beijing Forest University,Beijing,100083
国际会议
西安
英文
708-712
2010-10-11（万方平台首次上网日期，不代表论文的发表时间）