工作面底板太灰水可疏降性分析与疏降效果评价

Analysis of Descending Ability and Evaluation of Dewatering Effect of Ash Water from Floor at Working Face

针对顺和煤矿西翼采区构造较为发育,底板太灰边界条件,补给、径流、疏排条件复杂,工作面底板受太灰承压水突水威胁,影响工作面安全生产问题,结合2401工作面地质条件及水文地质资料,采用突水系数法计算,得出工作面底板突水系数大于临界系数0.06,工作面具有底板突水危险性。通过对工作面底板太灰水可疏降性分析,2401工作面底板灰岩上段含水层的连通性较好,含水层的富水性弱,易于疏降。据此设计工作面疏水降压方案,并对疏降效果进行评价,工作面疏降周期可行、疏降效果明显。疏放效果评价结果表明,工作面采取疏水降压措施后,最大突水系数约在0.03 MPa/m,具备带压开采的基本水文地质条件,在正常情况下一般不会发生灾害性突水。

In view of the floor ash water inrush in the West Wing mining area of Shunhe Colliery,the water inrush coefficient of the floor of the working face is calculated by using the water inrush coefficient method,which is greater than the critical coefficient of 0.06 with the risk of water inrush from the floor based on the geological conditions and hydro-geological data at 2401 working face.By analysis of the descending ability of the floor ash water in the working face,it is found that the aquifer in the upper section of the floor limestone has good connectivity,weak water yield and easy drainage.The descending scheme is designed,whose evaluation results show that the maximum water inrush coefficient is about 0.03 MPa/m with basic hydrogeological conditions of mining under pressure and no disastrous water inrush under normal conditions.