深井综放采空区漏风流场数值模拟及自燃危险区域划分

Modeling of Flow Field and Partition of Spontaneous Combustion Danger Zone in Gob of Fully Mechanized Caving Face in Deep Coalmine

随着矿井开采深度的增加,地温的升高,带来了系列的灾害现象。分析了高地温综放采空区煤自燃的危险性,研究了采空区氧浓度场及漏风流场。通过对龙固矿N1301综放面采空区漏风场的数值模拟,得出了采空区渗流速度及氧浓度分布。并结合实验得出的放热强度、自然发火期等参数,对采空区浮煤自燃危险区域进行了划分,得到了工作面最小安全推进速度,为2.56m/d。

As increasing the mining depth in coalmine,the series calamities are happened by more and more strengthening mining strength and rising ground temperature.The danger of preventing and extinguishing technology of spontaneous combustion in goaf of fully mechanized caving face in deep and high temperature coalmine was analyzed,the and oxygen concentration field and air-leakage flow field in goaf of top-coal caving with false dip in thick seam was studied.Through numeric simulation,distribution of oxygen concentration and velocity of air flow in mined out area are deter-mined.With the simulating result together with critical value and the duration of coal spontaneous combustion obtained from experiment,boundary of self-heating zone is partitioned,and got the safe advancing is 2.56m/d.