| 油松根系抗拉应力与应变全曲线试验研究 |
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| 引用本文： | 刘秀萍,陈丽华,宋维峰,饶良懿,胡雨村.油松根系抗拉应力与应变全曲线试验研究[J].中国水土保持科学,2006,4(2):66-70. |
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| 作者姓名： | 刘秀萍 陈丽华 宋维峰 饶良懿 胡雨村 |
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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实验室,100083,北京 |
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| 摘 要： | 为探索林木根系固土力学机制,以黄土高原主要树种油松为研究对象,对其根系进行单根拉伸试验。应力与应变全曲线的理论分析和比较表明:在根系受拉后的初期阶段,荷载、应力、伸长、应变都是按比例增加,应力、应变呈直线关系。当加载超过弹性极限后,随着拉力的继续增加,根系发生塑性变形,应力与应变关系逐渐偏离直线,反映出高度非线性弹性特征。试验表明:油松根系抗拉强度与抗拉弹性模量存在极密切的相关性。根据试验结果提出根系受拉应力与应变全曲线统一数学表达式,其理论曲线与试验曲线吻合较好。
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| 关 键 词： | 油松根系 应力与应变全曲线 弹性模量 本构模型 |
| 收稿时间： | 2005-04-07 |
| 修稿时间： | 2006-01-18 |
Experimental on resistance to tensile stress and complete stress-strain curves of root system of Pinus tabuleeformis |
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| Liu Xiuping,Chen Lihua,Song Weifeng,Rao Liangyi,Hu Yucun.Experimental on resistance to tensile stress and complete stress-strain curves of root system of Pinus tabuleeformis[J].Science of Soil and Water Conservation,2006,4(2):66-70. |
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| Authors: | Liu Xiuping Chen Lihua Song Weifeng Rao Liangyi Hu Yucun |
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| Institution: | College of Water and Soil Conservation, Beijing Forestry University, Key Laboratory of Soil and Water Conservation and Combating Desertification, Ministry of Education, 100083, Beijing, China |
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| Abstract: | The mechanisms of soil-reinforcement by roots system have been researched through the tests for the pull-resistance of roots system of Pinus tabuleeformis in the Loess Plateau.The theory analysis and compare(results) of complete stress-strain curve show that load,stress,extend and strain increase pro rata, complete stress-strain curves present straight line relation in root system initial stage after tension.As the continuation of pulling force increases after loading over elastic limit,plasticity out of shape takes place in the root system,the complete stress-strain curves deviate from the straight line gradually, reflect the highly non-linear elastic characteristic.The test indicates that the root system tensile strength of the Pinus tabuleeformis have extremely close dependence to resist the amount of tension elastic model,according to results of the test,the unify mathematic expression of resistance to tensile stress and complete stress-strain curve is put forward,Which merge better between theory curves and experimental curves. |
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| Keywords: | root system of Pinus tabuleeformis stress and complete stress-strain curve elastic modulus constitutive model |
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