采矿与安全工程学报 ›› 2012, Vol. 29 ›› Issue (5): 730-734.

• 论文 • 上一篇    下一篇

易自燃煤层综放工作面安全开采方法研究

  

  1. 1.辽宁工程技术大学矿业学院,辽宁  阜新  123000;
    2.中国煤炭科工集团沈阳研究院,辽宁  沈阳  110016;
    3.煤矿安全技术国家重点实验室,辽宁  抚顺  113122
  • 收稿日期:2011-09-06 出版日期:2012-09-15 发布日期:2012-09-05
  • 作者简介:王岩(1981-),男,辽宁省沈阳市人,助理研究员,博士,从事矿山安全等方面的研究。 E-mail:yanwang9191891@163.com Tel:13897930386
  • 基金资助:

    国家重点基础研究发展计划(973)项目(2011CB201206);
    国家自然科学基金青年科学基金项目(50904033);
    辽宁省自然科学基金项目(20102090)

Study on Safety Mining Method of Fully-Mechanized Top-Coal Caving in Coal Seam with Easy Spontaneous Combustion and High Coal Dust

  • Received:2011-09-06 Online:2012-09-15 Published:2012-09-05

摘要: 鉴于在坚硬顶板煤层放顶煤过程中出现的顶煤冒落不能控制,煤尘大,可放性差,造成顶煤回采率低的问题,为提高顶煤的冒放性及控制煤层自燃,陕西长武亭南煤矿在111工作面回风平巷交替布置预裂爆破孔和控制孔,采用深孔控制预裂爆破结合动压注水的方法,实现工作面回采率提高8.5%,粉尘质量浓度由12.7 mg/m3降到8.9 mg/m3,并通过在控制孔注阻燃剂使原煤发热量降低470 cal/g,含水量增加2.56%,延缓了煤层的自热过程,改善了工作面的作业环境,实现易自燃高尘厚煤层综放面的安全开采。

关键词: 深孔控制预裂爆破, 放顶煤, 可放性, 动压注水

Abstract: Many problems, such as the difficulty of controlling top seam caving, the high dust concentration, the low top-coal recovery rate, may occur in the process of fully-mechanized top-coal caving in hard roof. To improve the cavability of the top-coal and control the spontaneous combustion, the presplitting blasting and controlling boreholes were arranged alternatively in the air-return roadway of coal face 111 in Tingnan coal mine, Changwu, Shaanxi, then the deep hole presplitting blasting combined with dynamic pressure water injection were carried out during the mining operation. Thus, the recovery rate of coal face was improved by 8.5%, the coal dust concentration decreased from 12.7 mg/m3 to 8.9 mg/m3. Meanwhile, through the injection of flame retardants in the controlling boreholes, the calorific value was decreased by 470 calorie per gram, the water content was increased by 2.56%, which effectively delayed the thermal process, improved the working environment, and ensured the safety mining of fully mechanized sublevel caving in the easy spontaneous combustion and high coal-dust coal seam.

Key words: deep hole presplitting controlled blasting, top-coal caving, degree of difficulty of coal caving, dynamic pressure water injection