特厚易自燃煤层综放开采采空区防灭火技术

针对特厚煤层综放开采过程中工作面推进速度慢、采空区遗煤量大、漏风严重、极易自燃的特点，建立特厚煤层综放开采采空区渗流及扩散数学模型。利用富力矿-380 m前部22#层采空区的特征，对该特厚煤层采空区作出相应的假设，对该工作面采空区自燃“三带”进行划分，最终确定氧化带为采后距工作面25~60 m的范围。根据模拟结果，采取注氮注浆防灭火措施，取得较好的效果。利用该工作面现场数据进行数据拟合，验证防火措施效果，较好地达到防灭火的目的。

Fire Prevention Technology of Mined-out Area under the Fully Mechanized Caving for Extremely Thick Spontaneous Combustion Coal Seam

During the process of fully mechanized caving for extremely thick coal seam,there are some issues to be solved,such as slow advance in working face,great amount of left-over coal in mined-out area,serious leakage,and easy to be spontaneous combustion,so the seepage flow and diffusion mathematical model for the fully mechanized caving of the extremely thick seam was built.With the use of features of 22# goaf at -380 m front of Fuli Mine,corresponding assumptions on the mined-out area in extremely thick coal seam were made,and the spontaneous combustion “three zones” in mined-out area were divided,ultimately determining that the oxidation zone away from the working face was within the range of from 25 m to 60 m.According to the numerical simulation,fire prevention measures of nitrogen injection and grouting were adopted,with good effects obtained.Meanwhile,data fitting with the field data in working face was made to verify the effect of fire prevention measures.It can be better to achieve the purpose of fire prevention.