【摘要】 采用抗拔法进行了冷杉、杜鹃、冬瓜杨、糙皮桦、花楸、荚迷、卫矛等7种树木根系应力-应变关系的实验研究,得出抗拔法可以用于对根系应力-应变关系进行检测。分别利用双曲线和二次抛物线模型模拟上述不同树种根系的应力-应变关系,并给出了相应的模型试验参数。模拟结果表明:根系的应力-应变关系用双曲线模型模拟误差较大,而用抛物线模型模拟则比较理想。对不同林木的根系,其应力-应变关系可近似用统一的本构关系描述,模型形式:σ/σ0=1.6475(εa/ε0)-0.6917(εa/ε0)2。更多还原

【Abstract】 A research was conducted on pull-out method for determining the root stress-strain relationships of Abies fabric,Rhododendron,populus pordomii,Betula utilis,Sorbus folgneri Viburnum cordifolium,Euonymus chloranthoides etc,A conclusion was reached that pull-out method might determine the stress-strain relations of root system.The stress-strain relationships of different forest root systems above are simulated by the hyperbolic and parabolic models,and the testing parameters of models are given.The simulation results show that the hyperbolic model to analyze the stress-strain relationship of the eco-material has a larger error,but the parabolic model to describe its stress-strain response is very reasonable.A uniform constitutive relation can be used to describe the stress-strain relationship of different root systems,and its expression is σ/σ₀=1.6475（ε_a/ε₀）-0.6917（ε_a/ε₀）2.更多还原