Effects of gauge length and strain rate on the tensile strength of tree roots
Effects of gauge length and strain rate on the tensile strength of tree roots
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DOI：
10.1007/s00468-012-0732-5
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发表时间：
2012-05
期刊：
影响因子：
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通讯作者：
Chao-bo Zhang;Li-hua Chen;Jing Jiang;Shuo Zhou
中科院分区：
文献类型：
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作者：
Chao-bo Zhang;Li-hua Chen;Jing Jiang;Shuo Zhou
根系抗拉强度在土壤稳定和固定中起着重要作用。测试和分离影响根抗拉强度的不同因素是很重要的。研究了根径、应变速率、种数和根径4个因素对根抗拉强度的影响。以中国北方山区常见的5种树种——油松（Pinus tabulaeformisCarr.）、落叶松（Larix principis-rupprechtiiMayr.）、白桦（Betula platyphyllaSuk.）、蒙古栎（Quercus mongolicusFisch.）和榆树（Ulmus pumilaL.）为研究对象，进行了根抗拉强度的单轴试验。结果表明，榆树和白桦根抗张力能力最强，其次是蒙古橡树和油松根。落叶松的根对拉力的抵抗力最低。根直径与根抗拉强度呈幂函数关系。经线性回归分析，根规长度与根抗拉强度呈负相关。抗拉强度随厚度的增加而降低。此外，在两种应变速率（10和400 mm min - 1）之间观察到意想不到的抗拉强度变化。本研究可为进一步研究不同试验条件下根系力学特性及根系加固奠定基础，但需谨慎进行。
Root tensile strength plays an important role in soil stabilization and fixation. Testing and separating the different factors that affect root tensile strength are important. In the present study, the effects of four factors, namely, gauge length, strain rate, species, and root diameter, on root tensile strength were studied. Uniaxial tensile tests were conducted to acquire the root tensile strength of five tree species commonly growing in the mountains of northern China, namely, Chinese pine (Pinus tabulaeformisCarr.), Larch (Larix principis-rupprechtiiMayr.), White birch (Betula platyphyllaSuk.), Mongolian oak (Quercus mongolicusFisch.), and Elm (Ulmus pumilaL.). Based on the results, Elm and White birch roots were the most resistant to tension, followed by Mongolian oak and Chinese pine roots. Larch roots were found to be the least resistant to tension. A power relationship was established between root diameter and root tensile strength. Based on linear regression analysis, gauge length was negatively correlated with root tensile strength. Tensile strength decreased with increasing gauge length. In addition, an unexpected variation of tensile strength was observed between two strain rates (10 and 400 mm min−1). The present study can serve as a basis for further studies on mechanical properties of root system and root reinforcement under different test circumstances, although this should be done with caution.