堵漏技术在无煤柱开采防火中的应用

无煤柱开采技术已广泛应用。该技术虽然提高了回采率,但同时也加剧了采空区的漏风量,大面积采空区联通给防灭火带来了难题。由于采空区难以触及等原因很难直接探知采空区内煤岩体的自燃情况。文中采用有限单元法计算了采空区内渗流速度场和氧浓度场分布,通过两者叠加划出了采空区堵漏前后自燃＂三带＂分布,并对比分析了堵漏前后两种情况下自燃带宽度的变化,可以看出漏风对采空区＂三带＂分布的影响较大,显示了在无煤柱开采中应用堵漏技术防治采空区自燃的必要性。

Plugging technology applied to fire prevention of mining without coal pillar

The popular technology of mining without coal pillar improves the recovery rate.However,this technology may also aggravate the air leakage of mined-out area,and the collusion of widespread mined-out areas may lead to fires which are difficult to control.It is so difficult to directly investigate the spontaneous combustion of coal-rock mass in gob beyond the touching.In this paper,the distributions of seepage velocity and oxygen concentration are numerical computed by using the finite element method.The "three zones" distribution of spontaneous combustion is respectively divided before and after plugging the mined-out area through the superposition of seepage velocity field and oxygen concentration.The changes of spontaneous combustion width are comparably analyzed under different conditions.The results show that air leakage in mined-out area has larger effect on the "three zones" distribution of spontaneous combustion.It is so necessary to adopt the plugging technology to control the spontaneous combustion of coal-rock mass in mined-out area.