地面深孔预裂爆破顶板煤柱的试验研究  

Experimental Study on Coal Pillar of Roof in Deep Hole Pre-splitting Blasting

作　　者：沈玉旭 李鹏 郭帅[2] SHEN Yuxu;LI Peng;GUO Shuai(Shanxi Institute of Energy,Jinzhong 030600,China;Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]山西能源学院,山西晋中030600 [2]内蒙古科技大学,内蒙古包头014010

出　　处：《煤矿安全》2020年第8期63-66,共4页Safety in Coal Mines

基　　金：山西省应用基础研究青年基金资助项目(201801D221356);山西能源学院自然科学基金资助项目(ZY-2018010);山西省重点研发计划资助项目(社会发展)(201903D321080)。

摘　　要：针对某矿31203综采面回采时受上部22煤集中隔离煤柱影响易发生支架冲击载荷等难题,经计算确定地面深孔预裂爆破炸药单耗、单孔装药量、炮孔间距、封孔长度等参数,制定顶板爆破的方案。爆破效果表明:爆破实施后31203综采工作面顶板回采时及时垮落,根据矿压观测数据分析初次来压步距为43 m,比上个工作面减少15 m,来压时工作面支架载荷正常,顶板大部分及时垮落,上隅角O2、CO、瓦斯等有毒有害气体浓度正常,周期来压步距12.4 m,最大压力46 MPa,来压持续1刀,工作面及两巷顶板垮落正常。工程试验表明,地面深孔预裂爆破顶板煤柱破坏煤柱的完整性,释放部分压力,避免工作面冲击载荷等事故的发生。The impact load of support is easy to occur in the mining of 31203 fully mechanized mining face under the influence of the isolated pillar of 22#coal in the upper part, the parameters such as single consumption of explosive, charge of single hole,spacing of gun hole and length of sealing hole are determined by calculation to make plans for roof blasting. Blasting effect shows that: after the implementation of the blasting, the roof of 31203 fully mechanized mining face of collapsed in time during the mining, according to the analysis of mine pressure observation data, the first pressure step distance is 43 m, 15 m less than the last working face, the working face support load is normal when the pressure comes, most of the roof caved in time, the concentration of O2, CO, gas and other toxic and harmful gases in the upper corner is normal, step distance of periodic pressure is12.4 m, the maximum pressure is 46 MPa, and the pressure lasts for 1 cut, the roof of the working face and two lanes collapsed normally. The engineering test shows that the coal pillar on the roof of the deep hole pre-splitting blasting destroys the integrity of the coal pillar, releases part of the pressure, and greatly avoids the accident of the impact load on the working face.

关 键 词：地面深孔 预裂爆破 隔离煤柱 冲击载荷 初次来压 

分 类 号：TD235.371[矿业工程—矿井建设]