【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。更多还原

【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.更多还原