摘要
开采解放层是最有效的区域性防突手段,目前在我国的煤矿开采中被广泛采用,但有些矿井的所有煤层均为突出煤层,不具备开采解放层的条件。本文将煤层底板岩层作为下解放层,运用深孔预裂爆破技术对其进行爆破。先在煤层底板岩层中打一定数量的爆破孔和控制孔,通过爆破使爆破孔和控制孔实现裂隙贯通,形成一定尺寸的空腔,从而利于煤层卸压和瓦斯抽放。本文以天府矿业公司三汇三矿为工程背景,运用有限元计算软件LS-DYNA确定了爆破孔和控制孔间形成贯通空腔的最大孔间距为0.7m。数值模拟结果与现场考察相近。
As the most effective regional measure of preventing the coal and gas outburst, mining the protective seam is widely used in the coal mining of our country. However, there are some mines whose coal seams are all coal and gas outburst coal seams. Conditions for mining the protective seam are not ripe yet now. In this thesis, the coal seam floor, which is regarded as the lower-pro- tective seam, will be blasted by deep-hole pre-splitting blasting technology. First, drill some explosive holes and control holes. After the blasting, larger number of horizontal cracks appear between explosive holes and control holes. There will be a cavity of a certain size, which contributes to pressure release of the coal seam and gas exhaust.Taking the Third Mine in Sanhui Mining Bureau as the project background, by employing the finite element calculation software of LS-DYNA, the maximum distance between explosive holes and con- trol holes was determined. When the distance is 0.7m, there will be a cavity between them. The results of numerical simulation were quite close to the results of the scene investigation.
出处
《黑龙江科技信息》
2012年第32期52-54,共3页
Heilongjiang Science and Technology Information
关键词
深孔预裂爆破
解放层
数值模拟
Deep-hole Pre-splitting Blasting
Protective Seam
Numerical Simulation
