For further understanding the coal spontaneous combustion in goaf, the dynamic evolution of the oxygen concentration field influenced by the condition of negative pressure of cross-cut were analyzed. Based on the on-site testing results, the range of the oxidation zone on the headentry and tailentry side is determined as 30 ~ 75 m and 15 ~ 65 m respectively. This paper adopts a new method called “fixed grid, dynamic attribute” to dynamically describe the spatial change of goaf caused by working face advancing. The validated model which developed by field measured data is used to study the dynamic evolution of negative pressure impact of cross-cut on oxygen concentration field in goaf. The results demonstrate that when the cross-cut is located at different positions of three zones of coal spontaneous combustion, the negative pressure of the cross-cut has different impact rules on the distribution of oxygen concentration field. The results are hopeful for providing effective guidance for coal mine fire prevention in goaf.

为了进一步理解采空区煤的自燃，分析了横切面负压条件下氧浓度场的动态演化。根据现场测试结果，确定在头ent侧和尾ent侧的氧化区范围分别为30〜75 m和15〜65 m。本文采用一种称为“固定网格，动态属性”的新方法来动态描述工作面前进导致采空区的空间变化。利用实测数据建立的验证模型用于研究横切面负压对采空区氧气浓度场的动态演化。结果表明，当横切线位于煤自燃三个区域的不同位置时，横切面的负压对氧浓度场的分布有不同的影响规律。研究结果有望为采空区的煤矿防火工作提供有效的指导。