摘要
如何了解破碎煤、矸放落时的运移规律并加以控制以提高煤炭采出率是放顶煤开采技术亟待解决的问题之一.对此本文针对该问题进行了顶煤放出规律的离散元数值模拟研究.通过块裂顶煤放落过程模拟软件的编制开发和块裂顶煤放落过程的离散元数值模拟研究,获得了块裂顶煤在无振动和振动条件下顶煤的放落规律.研究结果表明,采用振动放顶煤技术,可有效地破坏块裂顶煤在重力放落过程(无振动条件下)中出现的拱式结构;同时采用振动放顶煤技术,可使块裂顶煤的放落过程由漏斗式下落转变为较稳定的逐层均匀放落,验证了利用该技术可达到提高顶煤采出率、降低含矸率的目的.
How to understand the migration law of block top-coal and rock caving so as to increase the top-coal recovery ratio is one of the urgent problems to be solved for the longwall top-coal caving mining technology. Aiming at this problem, we numerically simulated the topcoal caving process and obtained the top-coal caving regularity of block top-coal under the conditions of vibration and non-vibration. The result shows that the formed arch structures really exist during the top-coal caving process under gravity condition and the vibration can easily destroy the formed arch structure. The top-coal caving under the vibration condition is a layerlike uniform caving process rather than a funnel-shaped caving under the gravitation condition. The aim of the top-coal caving with vibration technology to increase the top-coal recovery ratio and lower down the waste content has reached.
出处
《采矿与安全工程学报》
EI
北大核心
2008年第2期188-191,共4页
Journal of Mining & Safety Engineering
基金
国家“十一五”科技支撑计划项目(2006BAK04B02)
关键词
振动
顶煤
离散元
数值模拟
vibration
top-coal
discrete element
numerical simulation
