厚煤层分层开采采空区自燃“三带”规律及防治研究

发布时间：2018-07-07 08:27

本文选题：分层开采 + 厚煤层　；参考：《煤炭科学技术》2016年10期

【摘要】：针对陕北某矿5101工作面易自燃厚煤层分层开采采空区遗煤自燃危险性大的问题,通过现场监测其上、下分层采空区气体成分变化并进行该工作面煤样的自然发火试验,研究下分层开采时采空区自燃的极限参数及自燃"三带"分布规律。研究表明:下分层回采时,原来为窒息带的上分层采空区以及下分层工作面后的采空区形成了2个自燃"三带",且上分层初次氧化的遗煤经二次氧化自燃危险性会大幅增加,同时采空区自燃危险区域宽度增大了100 m以上,初始CO浓度增长较快。在回采期间采取了注氮、采空区两侧堵漏、注浆等防火技术措施,并进行了效果检验以保证工作面的正常回采。
[Abstract]:In order to solve the problem of high risk of spontaneous combustion in goaf of 5101 face of a coal mine in north Shaanxi, the change of gas composition in the upper and lower goaf is monitored on the spot and the spontaneous combustion test of the coal sample in this face is carried out. The limit parameters of spontaneous combustion in goaf and the distribution law of "three zones" of spontaneous combustion are studied. The results show that two spontaneous combustion "three zones" have been formed in the goaf of the upper stratified goaf and the goaf behind the lower stratified working face, and the danger of spontaneous combustion of the coal left by the first oxidation of the upper stratification will be greatly increased by the second oxidation. At the same time, the width of the danger zone of spontaneous combustion in goaf increased by more than 100 m, and the initial CO concentration increased rapidly. During the mining, the measures of preventing fire are adopted, such as nitrogen injection, leakage plugging on both sides of goaf, grouting and so on, and the effect test is carried out to ensure the normal mining of the working face.
【作者单位】：西安科技大学西部矿山开采及灾害防治教育部重点实验室;西安科技大学安全科学与工程学院;
【基金】：国家自然科学基金资助项目(U1361129) 陕西省科学技术研究发展计划资助项目(2012KW-27-01)
【分类号】：TD752.2

【相似文献】