综放面采空区注氮前后“三带”分布数值模拟  

Numerical Simulation on Distribution of "Three zones" in Gob of Full-mechanized Caving Face before and after Being Injected Nitrogen

作　　者：姚元领[1] 胡泊[1] 李洁莹[1] 徐琴[1] 鲁义[1] 

机构地区：[1]中国矿业大学安全学院,江苏徐州221008

出　　处：《煤矿安全》2011年第1期13-16,21,共5页Safety in Coal Mines

摘　　要：采空区"三带"分布及变化规律的研究,是综放面自燃预测的基础。运用流体软件结合大兴煤矿703综放工作面建立了采空区多孔介质模型,通过对注氮前后采空区内O2浓度变化的数值模拟得出采空区内"三带"范围的变化,并结合大兴矿煤的自然发火期,确定了工作面不发生自燃的最小推进度,据此可以对综放面采空区自燃危险性进行预测与防治。Distribution and variation of ＂three zones＂ in gob is the basis of predicting spontaneous in mined-out area.In this paper,we firstly established the porous medium mode of goaf using the fluid software combining the practical case of north of 703 fully mechanized caving face of Daxing mine,Obtained changes in the scope of ＂three zones＂ in gob by numerical simulation of oxygen concentration before and after injecting nitrogen,referring the spontaneous combustion of Daxing Coal Mine,identified the minimum advancing,which ensured that it didn＇t occur spontaneous combustion in the face.Accordingly,we can predict the spontaneous combustion danger in gob of mined-out area.

关 键 词：多孔介质 “三带” 氧浓度 数值模拟 

分 类 号：TD752.2[矿业工程—矿井通风与安全]