Effect of soil particle-size distribution (PSD) on soil-subsoiler interactions in the discrete element model
Abstract
Aim of study: This work investigated the significance and mechanism for the effect of particle-size distribution (PSD) under different nominal radii using the discrete element method (DEM) and validated using the laboratory soil-bin results to accurately determine PSD.
Area of study: Yangling, China
Material and methods: The experimental soil was Lou soil. Soil disturbance characteristics (soil rupture distance ratio, height of accumulated soil, soil density change rate) and cutting forces (draft and vertical) under different treatments were predicted and measured respectively.
Main results: The ANOVA outputs showed that PSD significantly affected draft and vertical forces (p<5%) while soil disturbance characteristics was significantly affected by PSD only when particles of 9 mm nominal radii or larger were used in DEM models. Both draft and vertical forces in real time were noisier at larger PSDs. For the given soil, more realistic soil disturbance characteristics and draft force can be achieved by taking PSD into account in the calibration of DEM models; however, vertical force can be predicted with a relatively low error only when particles of 7 mm nominal radii or smaller are used in the discrete element model, regardless of the magnitude of PSD.
Research highlights: The significance and mechanism for the effect of PSD provided in this study can be used to guide the decision of particle-size distribution in the soil-tool interaction DEM models (using the HMB contact model).
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References
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