發(fā)布時(shí)間：2018-11-26 12:03

【摘要】：【目的】實(shí)現(xiàn)黏性土壤離散元模型的接觸參數(shù)與接觸模型參數(shù)標(biāo)定�！痉椒ā炕谕寥蓝逊e角物理試驗(yàn)結(jié)果,采用考慮顆粒間黏結(jié)力的"Hertz-Mindlin with JKR"接觸模型進(jìn)行土壤堆積角仿真試驗(yàn),借助GEMM(Generic EDEM material model database)數(shù)據(jù)庫獲得離散元模型關(guān)鍵參數(shù)(包括JKR表面能、恢復(fù)系數(shù)、靜摩擦系數(shù)與動(dòng)摩擦系數(shù)),進(jìn)一步運(yùn)用Box-Behnken試驗(yàn)方法進(jìn)行堆積角仿真試驗(yàn)�！窘Y(jié)果】通過對(duì)試驗(yàn)結(jié)果進(jìn)行多元回歸擬合分析獲得了堆積角回歸模型,回歸模型的方差分析表明該模型極顯著,試驗(yàn)因素對(duì)堆積角的影響為二次多項(xiàng)式,且存在復(fù)雜的一次與二次交互作用。以堆積角40.45°為目標(biāo)對(duì)回歸模型進(jìn)行尋優(yōu),得到了優(yōu)化解:JKR表面能7.91J·m-2;恢復(fù)系數(shù)0.66;靜摩擦系數(shù)0.83;動(dòng)摩擦系數(shù)0.25。以此優(yōu)化解進(jìn)行仿真試驗(yàn)獲得的堆積角為39.73°。堆積角仿真試驗(yàn)與物理試驗(yàn)在堆積角度和形狀上具有較高的相似性。【結(jié)論】可利用該優(yōu)化參數(shù)對(duì)樣品土壤進(jìn)行進(jìn)一步的黏性土壤與觸土部件間的離散元仿真,從而揭示黏性土壤在觸土部件作用下的運(yùn)動(dòng)規(guī)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 擄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 擄. 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.
【作者單位】： 華南農(nóng)業(yè)大學(xué)工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(51405164) 國(guó)家科技支撐計(jì)劃(2014BAD06B03-01)
【分類號(hào)】：S152.9
，

本文編號(hào)：2358507