%0 Journal Article %T 自然沙堆积的静止角研究<br>Research on the angle of repose of natural sand %A 周向玲 %A 麦麦提吐逊·阿布都热依木 %A 俞胜清 %A 李华振< %A br> %A ZHOU Xiang-ling %A muhammadtursun·ABUDUREYIM %A YU Sheng-qing %A LI Hua-zhen %J 山东大学学报（理学版） %D 2015 %R 10.6040/j.issn.1671-9352.0.2014.360 %X 摘要： 以塔克拉玛干沙漠西南边缘自然沙丘的沙子为研究对象,对不同粒径的沙采用漏斗法进行沙堆积,并录像记录了沙的堆积过程。将录像处理成图片,用计算软件“CorelDraw”处理,从而得到沙堆静止角和崩塌角随时间和沙粒粒径的变化关系。得出结论:(1)沙堆的静止角随时间呈振荡变化。首先,静止角逐步变大到崩塌角,崩塌后堆积角回到静止极角,然后再增大到崩塌角,如此往复。(2) 当粒径小于0.30 mm时,沙堆崩塌角及崩塌角与静止极小角的差值随沙粒粒径的增大而增大:但当粒径大于0.30 mm时,其差值随沙粒粒径的增大而减小。(3)崩塌角与静止极角差值的平均值为(4.6±0.6)°。(4)混合沙的崩塌角与静止极角的差值为(5.2±0.3)°。<br>Abstract: In this paper we take the sands collected from the natural dunes at the southwest edge of Taklimakan desert as our experimental subjects. We drift the sands into mounds by using static funnel method and record some videos for the drifting processes Then we translate the videos into pictures and analyze them by the computer software “CorelDraw”. By analysis we get the Dependence of the static angle and the collapse angle of the sand mounds on the time and the particle size. Then we make some conclusions: (1) The angle of the sand mound always follow the same circle, i.e., from the maximum static angle to the collapse angle and back to the minimum static angle. Thus the static angles oscillate over time. (2) When the particle diameter is less than 0.3 millimeter, the difference between the collapse angle and the static angle will be increased with the increase of the particle size. Whereas when the particle diameter is greater than 0.3 millimeter, it will be decreased with the increase of the particle size. (3) The average difference between the collapse angle and the static angle is (4.6±0.6)°. (4) The difference between the collapse angle and the static angle of the mixed sand mounds is range(5.2±0.3)° %K 颗粒物质 %K 崩塌角 %K 沙粒 %K 沙堆 %K 静止角 %K < %K br> %K sand %K sand heap %K static angle %K collapse angle %K particulate matter %U http://lxbwk.njournal.sdu.edu.cn/CN/10.6040/j.issn.1671-9352.0.2014.360