散粒块石自然休止角模拟试验的影响因素分析
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摘要
针对边坡、库岸散粒块石堆落体休止角影响因素问题,通过离散元软件,从细观力学的角度,对8种影响休止角的主要因素分别进行了试验模拟,并且对模拟的结果分别进行单因素方差分析.结果表明:各因素对散粒块石休止角的影响的显著性由大到小排序为:散粒体颗粒大小v、颗粒-颗粒间摩擦系数fb-b、切向刚度ks、散粒体颗粒范围v?、颗粒-容器间摩擦系数fb-w、法向刚度kn、散粒块石形状、抛落高度h.
In view of the factors affecting the resting angle of bulk rocks on slopes and reservoir banks, eight main factors affecting the resting angle of bulk rocks are simulated using discrete element software from the point of view of micro-mechanics, and the simulation results are analyzed by one-way ANOVA. The significance of impact of the various factors on the angle of repose of bulk stone ranked in descending order is: particle size, friction coefficient between particles, tangential stiffness, particle range, friction coefficient between particles and vessels, normal stiffness, shape of granular boulders and dropping height.
In view of the factors affecting the resting angle of bulk rocks on slopes and reservoir banks, eight main factors affecting the resting angle of bulk rocks are simulated using discrete element software from the point of view of micro-mechanics, and the simulation results are analyzed by one-way ANOVA. The significance of impact of the various factors on the angle of repose of bulk stone ranked in descending order is: particle size, friction coefficient between particles, tangential stiffness, particle range, friction coefficient between particles and vessels, normal stiffness, shape of granular boulders and dropping height.
引文
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[2]李仕雄,姚令侃,蒋良潍.松散边坡演化特征及其应用[J].四川大学学报(工程科学版),2004, 36(2):7-11.
[3]魏丽娜,李川,傅荣华.散粒体斜坡稳定性相关因素试验研究[J].水利与建筑工程学报,2014, 12(1):55-61.
[4]何娜.撒落型散粒体斜坡变形破坏机制试验研究[D].成都:成都理工大学,2013.
[5]温辉波.库岸松散堆积体抗剪强度试验研究[D].重庆:重庆交通大学,2012.
[6]袁会娜,张骏,张其光.掺砾黏土拉伸断裂细观特性研究[J].岩土力学,2016, 37(11):3096-3104.
[7] WILLIAMS J R, PERKINA E, COOK B, et al. A contact algorithm for partitioning N arbitrary sized objects[J].Engineering Computation, 2004, 21(2-4):235-248.
[8] KIM S H, KIM N. Micromechanics analysis of granular soils to estimate inherent anisotropy[J]. KSCE Journal of Civil Engineering, 2007, 11(3):145-149.
[9]蒋明镜,张望城,王剑锋.密实散粒体剪切破坏能量演化的离散元模拟[J].岩土力学,2013, 34(2):551-558.
[10]李勤良.颗粒堆积性质和散状物料转载过程的DEM仿真研究[D].大连:东北大学,2010.
[11]李艳洁,徐泳.用离散元模拟颗粒堆积问题[J].农机化研究,2005(2):57-59.
[12]李艳洁.堆积问题的离散元模拟—实验研究[D].北京:中国农业大学,2005.
[13]孔亮,彭仁.颗粒形状对类砂土力学性质影响的颗粒流模拟[J].岩石力学与工程学报,2011, 30(10):2112-2119.
[14]李旭,王鹏程,敖国栋,等.多边形道砟颗粒堆积和压缩特性的DDA数值模拟研究[J].铁道学报,2014,36(4):71-75.
[15]田晓红,李光涛,张淑丽.谷物自然休止角测量方法的探究[J].粮食加工,2010,3(1):68-71.
[16]田晓红,谭斌,刘明,等.漏斗法粮食休止角测量结果的影响因素研究[J].中国粮油学报,2011, 26(10):108-113.
[17]李少华,张轩,张立栋.干馏炉内颗粒混合特性的数值研究[J].计算机,2011, 28(10):287-291.
[18]于献彬,陈晓清,纪佑军.基于数值模拟的套管受力单因素分析[J].西南石油大学学报(自然科学版),2015, 37(4):127-134.
[19]冯增昭.单因素分析多因素综合作图法——定量岩相古地理重建[J].古地理学报,2004(1):3-19.