Estimating soil failure due to torsion via vane shear test by varying vane diameter and soil properties
Estimating soil failure due to torsion via vane shear test by varying vane diameter and soil properties
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DOI：
10.1016/j.still.2017.12.004
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发表时间：
2018-04
影响因子：
6.5
通讯作者：
Changbin He;Yong You;Decheng Wang;Hongjian Wu
中科院分区：
文献类型：
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作者：
Changbin He;Yong You;Decheng Wang;Hongjian Wu
土壤-工具相互作用对研究人员、开发人员和制造商提出了持续的挑战。许多研究集中在反作用力，阻力，以及相关的土壤破坏过程中的耕作工具进入土壤或其表面运动。然而，很少有研究致力于在农业耕作系统中的土壤扭转破坏所涉及的相互作用。为了研究扭转作用下土体的抗破坏能力，本研究建立了一个扭转引起的土体破坏估算模型，该模型基于在土槽中进行的不同物理性质（即，水分含量和土壤密度）。设计了四个具有不同直径但相同高度（5cm）的叶片。然后测量和分析土壤破坏发生时的最大扭矩。结果表明，土壤扭转破坏与叶片直径之间呈幂函数关系，即，T = αDβ（R2> 0.96）。模型的无量纲参数α和β分别与土壤含水量（P < 0.05）和容重（P < 0.05）相关。α和β值均与土壤含水量、圆锥指数和容重呈非线性关系。结果表明：扭矩与叶片直径之间的关系可用幂函数描述;当测量装置在土层中产生扭转作用时，可利用叶片直径沿着土体含水率和容重估算土体破坏时的扭矩。当叶片高度不变时，在一定的土壤条件下，可以用所提出的幂函数模型预测扭转。
Soil–tool interaction poses an ongoing challenge to researchers, developers, and manufacturers. Numerous studies have focused on reaction forces, resistances, and associated soil failures during the penetration of tillage tools into soil or their surface movements. However, little research has been devoted to the interactions involved in the torsion failure of soil in agricultural tillage systems. To study the resistance of soil to failure due to torsion actions, this study develops a torsion-induced soil failure estimation model that is used to obtain relevant parameters based on in-situ experiments conducted in a soil bin by using soil with different physical properties (i.e., moisture content and soil density). Four vanes with various diameters but the same height (5 cm) were designed. The maximum torques at which soil failure occurred were then measured and analyzed. The results revealed a power function relationship between the soil failure due to torsion and the diameter of the vane, i.e.,T = αDβ(R2> 0.96). The dimensionless parameters α andβof the estimation model were found to be related to the soil moisture (P < 0.05) and bulk density (P < 0.05), respectively. The values of both α and β varied nonlinearly with the soil moisture content, cone index, and bulk density. It was concluded that the power function can be applied to describe the relationship between the torque and the diameter of the vane; with the measurement device performing a torsion action in the soil layer, the torque at which soil failure occurs can be estimated by using the diameter of the vane along with the moisture content of the soil and its bulk density. When the height of the vane was constant, the torsion could be predicted by using the proposed power function model at certain soil conditions.