工程科学学报
工程科學學報
공정과학학보
Journal of University of Science and Technology Beijing
2015年
10期
1251-1259
,共9页
孙浩%金爱兵%高永涛%孟新秋
孫浩%金愛兵%高永濤%孟新鞦
손호%금애병%고영도%맹신추
地下开采%崩落开采法%流动特性%可视化
地下開採%崩落開採法%流動特性%可視化
지하개채%붕락개채법%류동특성%가시화
underground mining%caving%flow characteristics%visualization
基于离散元理论和PFC3D程序构建放矿模型,探究多放矿口条件下崩落矿岩流动特性,实现多放矿口条件下放出体及矿石残留体形态变化过程的可视化。同时,将模拟结果与已有研究结论进行对比分析,验证基于PFC程序的放矿模型在崩落矿岩流动特性研究中的可靠性。放矿PFC模拟结果表明,多放矿口条件下放出体形态会因各放矿口间的相互影响而产生交错、缺失等程度的不同变异,并不是一个规则的椭球体。在单一放矿口和多放矿口条件下,放出体高度的变化趋势均可概括为两个阶段:在放矿初始阶段,放出体高度呈指数形式快速增加,随放矿量的增加,其增长率逐渐减小;随后,放出体高度将随放矿量的增加而呈线性增长的趋势。矿石损失率随放矿口尺寸及崩落矿石层高度的增大而减小,随放矿口间距的增大而增大。当相邻放矿口间产生相互影响时,平面放矿方式与立面放矿方式相比,其矿石残留量更小,且崩落矿岩接触面呈近似水平状态下降。
基于離散元理論和PFC3D程序構建放礦模型,探究多放礦口條件下崩落礦巖流動特性,實現多放礦口條件下放齣體及礦石殘留體形態變化過程的可視化。同時,將模擬結果與已有研究結論進行對比分析,驗證基于PFC程序的放礦模型在崩落礦巖流動特性研究中的可靠性。放礦PFC模擬結果錶明,多放礦口條件下放齣體形態會因各放礦口間的相互影響而產生交錯、缺失等程度的不同變異,併不是一箇規則的橢毬體。在單一放礦口和多放礦口條件下,放齣體高度的變化趨勢均可概括為兩箇階段:在放礦初始階段,放齣體高度呈指數形式快速增加,隨放礦量的增加,其增長率逐漸減小;隨後,放齣體高度將隨放礦量的增加而呈線性增長的趨勢。礦石損失率隨放礦口呎吋及崩落礦石層高度的增大而減小,隨放礦口間距的增大而增大。噹相鄰放礦口間產生相互影響時,平麵放礦方式與立麵放礦方式相比,其礦石殘留量更小,且崩落礦巖接觸麵呈近似水平狀態下降。
기우리산원이론화PFC3D정서구건방광모형,탐구다방광구조건하붕락광암류동특성,실현다방광구조건하방출체급광석잔류체형태변화과정적가시화。동시,장모의결과여이유연구결론진행대비분석,험증기우PFC정서적방광모형재붕락광암류동특성연구중적가고성。방광PFC모의결과표명,다방광구조건하방출체형태회인각방광구간적상호영향이산생교착、결실등정도적불동변이,병불시일개규칙적타구체。재단일방광구화다방광구조건하,방출체고도적변화추세균가개괄위량개계단:재방광초시계단,방출체고도정지수형식쾌속증가,수방광량적증가,기증장솔축점감소;수후,방출체고도장수방광량적증가이정선성증장적추세。광석손실솔수방광구척촌급붕락광석층고도적증대이감소,수방광구간거적증대이증대。당상린방광구간산생상호영향시,평면방광방식여립면방광방식상비,기광석잔류량경소,차붕락광암접촉면정근사수평상태하강。
Based on the particle flow theory and PFC3D code, a draw model was constructed to research the flow characteristics of caved ore and rock in the multiple draw-point condition and visualize the form-changing process of the isolated extraction zone ( IEZ) and the ridge hangover body. Simultaneously, the suitability and reliability of this draw model were validated in the flow characteristics study of caved ore and rock by comparative analysis between simulated results and existing research conclusions. Due to interactions among multiple draw-points, the IEZ’ s form produces different degrees of variation in the multiple draw-point condition, including interlacement and deficiency, which result in that the IEZ’ s form is not a regular ellipsoid. The height changing trend of the IEZ in both the isolated draw-point condition and the multiple draw-point condition can be divided into two stages:in the first stage, the IEZ’ s height rapidly increases in an exponential form at the initiation of draw and its growth rate decreases with the increase of ore-drawn mass;in the second stage, the IEZ’ s height linearly increases with the increase of ore-drawn mass. The ore loss ratio decreases when the draw-point dimension and the height of the caved ore layer increase, but it increases with the increasing of draw-point spacing. When adjacent draw-points interact with each other, compared with a facade draw mode, the ridge hangover mass is less in a plane draw mode, and the contact surface of caved ore and rock horizontally drops.