(1. 廣西大學(xué) 資源環(huán)境與材料學(xué)院，南寧 530004；
2. 廣西大學(xué) 土木建筑工程學(xué)院，南寧 530004)
摘 要: 本文基于離散元軟件，開展多漏斗放礦過程中散體介質(zhì)接觸力特性的量化研究。結(jié)果發(fā)現(xiàn)：放礦過程中，散體介質(zhì)內(nèi)部越靠近底部接觸力集度越大，不同類型接觸力概率分布均呈指數(shù)式衰減，且接觸力強度的分布規(guī)律也具有較高的相似性；放礦前中期接觸力網(wǎng)絡(luò)的方向偏向y軸方向(鉛垂方向)，隨著礦石顆粒不斷放出，接觸力網(wǎng)絡(luò)方向逐漸偏向x軸方向(水平方向)；放礦初期，接觸力沿y軸方向較大，沿x軸方向接觸力較小，法向接觸力主要集中在鉛垂方向；直至放礦中期，與水平方向夾角為30°的法向接觸力逐漸增多，接觸力分布的主方向由一個變?yōu)槿齻€；放礦后期，與水平方向呈45°夾角的法向接觸力逐漸增多，接觸力分布方向由三個轉(zhuǎn)變?yōu)榱鶄€。
關(guān)鍵字: 多漏斗放礦；散體介質(zhì)；接觸力；演化特征；量化研究
（1. College of Resources, Environment and Materials, Guangxi University, Nanning 530004, China;
2. College of Civil Engineering, Guangxi University, Nanning 530004, China）
Abstract:In this paper, the quantitative study of contact force characteristics of granular materials in multi-funnel ore drawing process was carried out based on discrete element software. The results show that, during the process of ore drawing, the closer to the bottom of the granular materials, the greater the contact force concentration; the probability distribution of different types of contact force in the process of ore drawing is in exponential form, and distribution law of contact force intensity is highly similar under the conditions of different drawing nodes. The direction of contact force network inside the granular materials is inclined to the y-axis direction (vertical direction) during the initial stage and medium stage of ore drawing, with the increase of ore drawing times, the direction of contact force network inside the granular materials is gradually inclined to the x-axis direction (horizontal direction). At the initial stage of ore drawing, the normal contact force shows obvious anisotropy, that is, the contact force along y-axis is larger than the contact force along x-axis direction, and the normal contact force mainly concentrates in the vertical direction. With the increase of ore drawing times, the normal contact force with an inclination angle of 30° to horizontal direction increases gradually, and the main distribution direction of contact force changes from one to three. At the later stage of ore drawing, the normal contact force with an inclination angle of 45° to horizontal direction increases gradually, and the distribution direction of normal contact force changes from three to six.
Key words: ore drawing from multi-funnel; granular medium; contact force; evolution characteristics; quantitative research
