| 华北落叶松根系抗拉力学特性 |
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| 引用本文： | 李晓凤,陈丽华,王萍花.华北落叶松根系抗拉力学特性[J].中国水土保持科学,2012,10(1):82-87. |
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| 作者姓名： | 李晓凤 陈丽华 王萍花 |
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| 作者单位： | 北京林业大学水土保持学院,水土保持与荒漠化防治教育部重点试验室,100083,北京 |
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| 基金项目： | 中国教育部博士基金“林木根系拉伸特性的试验研究”（20090014110002）; 国家自然科学基金项目“林木根系基本力学性能研究”（30872067）;国家自然科学基金青年科学基金项目“林木根系与土壤摩擦锚固性能研究”（30901162） |
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| 摘 要： | 华北落叶松作为水土保持先锋植物之一,其根系的力学抗拉特性是维持边坡稳定的一个重要因素.为探究落叶松根系的基本抗拉力学性质,选取不同根长、直径以及去皮与否的华北落叶松根系,以不同的拉伸速率进行室内单根拉伸试验.结果表明:根长100 mm的带皮根系以10 mm/min的速率拉伸时,其根系的抗拉强度与直径无明显的相关性,而其他的条件下,根系的抗拉强度随直径的增加而减小,且呈逆函数关系；华北落叶松根系的应力-应变曲线为单峰曲线,无明显颈缩,呈弹塑性材料特征；根长、去皮与否都对根系的抗拉强度有显著的影响,而拉伸速率对根系抗拉强度的影响不明显.研究结果可为进一步分析华北落叶松根系与土壤之间的相互作用机制、建立边坡稳定模型提供基础数据.
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| 关 键 词： | 落叶松根系 室内拉伸试验 抗拉强度 应力—应变曲线 去皮 |
Tensile mechanical properties of roots of Larix principis-rupprechtii |
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| Li Xiaofeng
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Chen Lihua
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Wang Pinghua.Tensile mechanical properties of roots of Larix principis-rupprechtii[J].Science of Soil and Water Conservation,2012,10(1):82-87. |
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| Authors: | Li Xiaofeng Chen Lihua Wang Pinghua |
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| Institution: | (College of Soil and Water Conservation,Beijing Forestry University,Key Lab.of Soil ＆ Water Conservation and Desertification Combating Ministry of Education,100083,Beijing,China) |
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| Abstract: | Larix principis-rupprechtii,as one of water and soil conservation pioneer species,the tensile mechanical property of its roots will play an important role in slope stability.In order to explore basic mechanics of its roots,peeled and not peeled roots of different length and diameters were carried out for indoor tensile test with different tensile rates.Results showed that tensile strength of not peeled roots of 100 mm length with 10 mm/min has no significant correlation with their diameter,while in the other conditions,tensile strength decreased with increasing diameter according to an inverse function.All root stress-strain curves were single-peak curves with elastic-plastic material characteristics.Both root length and peeled or not have significant effects on tensile strength,while tensile rate has no significant effect on tensile strength.The results in this paper could provide important basic data for discovering the interaction mechanisms between roots and soil and building slope stability model. |
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| Keywords: | Larix principis-rupprechtii roots indoor tensile test tensile strength stress-strain curve peeled root |
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