School of Energy,.Xian University of Science and Technology MOE Key Lab of Mining and Disaster Prevention and Control in West China Mine

为预防沿空留巷采空区内的煤自燃,研究了渗流规律、氧化带分布及影响氧化带范围的关键参数,建立了煤自燃多物理场耦合的动态模型,以典型工作面为例,分析了沿空留巷采空区内煤岩体冒落的分布特征,提出了对应的空隙率分布模型,并将解算结果与现场实测进行对比,计算结果表明:充填墙体厚度在1~4 m时,厚度对氧化带范围影响较小,而墙体的渗透率对氧化带影响显著,渗透率由10-12m2变化至10-9m2,氧化带最宽范围由60 m变化至105 m,面积逐渐增大;邻近采空区渗透率大于10-8m2时,靠近相邻采空区一侧氧化带范围显著增大;因此,对进、回风巷的充填墙体进行堵漏和加固是缩小采空区内煤自燃危险区域的有效措施。

in order to prevent and control coal spontaneous combustion in goaf of gob- side entry retaing,t he seepage law oxceaton zone distributon and key parameters aff cting to oxdation zone scope were studied. Anmuiti- physic fied coupling dynanic mocdel o cal spontaneous combustion was estabished. Taking typical coalmining face as example the paper analyzed caing distrbution features of coal and rock in goaf of gob- side entry retaining and put forward relevant pore rate ditibution mode. A comparison between the soltion results and site measurements was conducted. The caculaton resuts showed when that the thickress of stowing wall ange from 1 ~ 4 m,the thickress ould have less infuence to oxdation zone scope,.but the permeability of wall would have obvious infuence to oxcdatio zone scope. The permeablit varied from 10-12m2 to 10-9m2. The max wide scape of oxdation zone vaied from 6D m to 105 m and the area would be steadily increased.When the pemeability of neighoring goaf was higher than 10-8m2,the oxcdation zone scope of one side nearthe neighboring goaf ould be increased obviously.Therefor, the leakage sealing and reinforcement of stowing walls in intake airiay and return airvay would be efe ctive measures to reduce the danger rea of coal spontaneous combustion in goaf.

国家自然科学基金重点资助项目(51134019,51404195)；陕西省重点科技创新团队计划资助项目(2012KCT-09)；