考虑颗粒间黏结力的黏性土壤离散元模型参数标定
发布时间：2018-11-26 12:03
【摘要】：【目的】实现黏性土壤离散元模型的接触参数与接触模型参数标定。【方法】基于土壤堆积角物理试验结果,采用考虑颗粒间黏结力的"Hertz-Mindlin with JKR"接触模型进行土壤堆积角仿真试验,借助GEMM(Generic EDEM material model database)数据库获得离散元模型关键参数(包括JKR表面能、恢复系数、静摩擦系数与动摩擦系数),进一步运用Box-Behnken试验方法进行堆积角仿真试验。【结果】通过对试验结果进行多元回归拟合分析获得了堆积角回归模型,回归模型的方差分析表明该模型极显著,试验因素对堆积角的影响为二次多项式,且存在复杂的一次与二次交互作用。以堆积角40.45°为目标对回归模型进行寻优,得到了优化解:JKR表面能7.91J·m-2;恢复系数0.66;静摩擦系数0.83;动摩擦系数0.25。以此优化解进行仿真试验获得的堆积角为39.73°。堆积角仿真试验与物理试验在堆积角度和形状上具有较高的相似性。【结论】可利用该优化参数对样品土壤进行进一步的黏性土壤与触土部件间的离散元仿真,从而揭示黏性土壤在触土部件作用下的运动规律。
[Abstract]:[objective] to calibrate the contact parameters and the contact model parameters of the discrete element model of clay soil. [methods] based on the physical test results of soil accumulation angle, A "Hertz-Mindlin with JKR" contact model considering interparticle adhesion was used to simulate the soil accumulation angle. The key parameters of the discrete element model (including JKR surface energy and recovery coefficient) were obtained by means of GEMM (Generic EDEM material model database) database. Static friction coefficient and dynamic friction coefficient), the stacking angle simulation test is carried out by using Box-Behnken test method. [results] the stacking angle regression model is obtained by multivariate regression fitting analysis of the test results. The analysis of variance of the regression model shows that the model is very significant, and the influence of test factors on the stacking angle is quadratic polynomial, and there is a complex interaction between the first and the second order. The regression model was optimized with 40.45 掳stacking angle. The optimized solution was obtained as follows: JKR surface energy 7.91J m-2, recovery coefficient 0.66, static friction coefficient 0.83and dynamic friction coefficient 0.25. The stacking angle is 39.73 掳. The stacking angle simulation test is similar to the physical test in the stacking angle and shape. [conclusion] the optimized parameters can be used to simulate the discrete element between the clay soil and the contact soil parts. Thus, the movement law of clay soil under the action of soil contact components is revealed.
【作者单位】： 华南农业大学工程学院;
【基金】：国家自然科学基金(51405164) 国家科技支撑计划(2014BAD06B03-01)
【分类号】：S152.9
，
本文编号：2358507
[Abstract]:[objective] to calibrate the contact parameters and the contact model parameters of the discrete element model of clay soil. [methods] based on the physical test results of soil accumulation angle, A "Hertz-Mindlin with JKR" contact model considering interparticle adhesion was used to simulate the soil accumulation angle. The key parameters of the discrete element model (including JKR surface energy and recovery coefficient) were obtained by means of GEMM (Generic EDEM material model database) database. Static friction coefficient and dynamic friction coefficient), the stacking angle simulation test is carried out by using Box-Behnken test method. [results] the stacking angle regression model is obtained by multivariate regression fitting analysis of the test results. The analysis of variance of the regression model shows that the model is very significant, and the influence of test factors on the stacking angle is quadratic polynomial, and there is a complex interaction between the first and the second order. The regression model was optimized with 40.45 掳stacking angle. The optimized solution was obtained as follows: JKR surface energy 7.91J m-2, recovery coefficient 0.66, static friction coefficient 0.83and dynamic friction coefficient 0.25. The stacking angle is 39.73 掳. The stacking angle simulation test is similar to the physical test in the stacking angle and shape. [conclusion] the optimized parameters can be used to simulate the discrete element between the clay soil and the contact soil parts. Thus, the movement law of clay soil under the action of soil contact components is revealed.
【作者单位】： 华南农业大学工程学院;
【基金】：国家自然科学基金(51405164) 国家科技支撑计划(2014BAD06B03-01)
【分类号】：S152.9
，
本文编号：2358507
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