耿村煤矿高抽巷气体异常变化规律及三带范围研究

Study on Gas Abnormal Variation Law of High Level Gas Drainage Gateway and Three Zone Scope in Gengcun Mine

基于高瓦斯易自燃煤层高位巷道瓦斯抽采技术条件下,以研究采空区上覆岩层破断规律为切入点,以耿村矿12200综放工作面为研究背景,通过相关性分析及现场实测数据分析,对高抽巷气体异常变化规律进行研究。研究发现,由于采空区顶板垮落及顶板周期来压所导致竖向破断裂隙的不断发育,致使连接高抽巷的破断裂隙也处于"发育—完全发育—新裂隙形成"这样一个循环变化过程。与此同时,在抽放负压作用下,高抽巷中气体浓度将随着推进度的变化及裂隙的发育和形成而异常变化。另外,根据最大相关性系数原则,推算出采空区三带的范围。

Based on the conditions of the high gas content and spontaneous combustion coal seam gas extraction technology in high -position roadway, in order to study the goaf overlying strata fracture law as the starting point, taking the Yima Geng Village mine 12200 fully mechanized caving face as research background, to expand the study of the gas abnormal variation law of the high extracted roadway by correlation analysis, fluent simulation and field data analysis. The study found that, goaf roof caving and periodic roof pressure led to vertical fracture continuous development, resulting in broken fracture connected high extracted roadway in a process cycle of ＂developing - fully developed - new fracture formed＂. At the same time, under the drainage negative pressure, gas concentrations in high extracted roadway changed abnormally with the change of marching step of work, the development and formation of fracture. In addition, reckoning the scope of three zones in the goaf, in accordance with the principle of maximum correlation coefficient.