河东煤田放顶煤开采采空区三带分布探析

Analysis of Three Zones distribution law in gob of fully-mechanized caving face in Hedong coalfield

为探明河东煤田综放开采采空区三带分布特征,以河东煤田庞庞塔矿煤矿9-704工作面采空区为例,通过分阶段束管监测并抽气采样分析得到了采空区进、回风巷侧不同测点距工作面不同距离处氧气、一氧化碳、甲烷气体浓度参数,进而得到采空区内氧气浓度分布规律。依据采空区三带划分方法得出河东煤田庞庞塔矿9煤层采空区最大氧化升温带宽度为52 m,注氮系统安设氮气释放口的有效距离为30 m,回采工作面最小推进速度为1.29 m/d。

To obtain the distribution characteristics of Three Zones in gob of fully-mechanized caving face in Hedong coalfield,taking the gob of 9-704 fully-mechanized caving face of Pangpangta Coal Mine in Hedong coalfield as an example,the parameters of O_2,CO and CH_4 at different distances of different measuring points in the intake and return side from working face by site buried tube observation were obtained,and the distribution laws of O_2 concentration and air leakage intensity in the gob were obtained too. The hazardous area of spontaneous combustion in Pangpangta Coal Mine is divided by Three Zones division method,and the width of the oxidization heat accumulation zone is 52 m,the effective distance of N_2 output for nitrogen injection system is 30 m,and the minimum advance speed of working face is determined to 1. 29 m / d.