超化煤矿三软煤层采煤工作面底板承压水的防治

Prevention and Control of Floor Pressurized Water in Coal Mining Face in Seam with Soft Roof,Soft Coal and Soft Floor in Chaohua Mine

在带水压开采条件下,为了消除采煤工作面底板承压水的威胁,结合郑州矿区超化煤矿煤层底板含、隔水层情况,采用突水系数法划分底板突水威胁区域,通过物探、钻探查明底板富水区的分布情况,对煤层底板薄层含水层进行注浆以将含水层变为隔水层,在工作面生产过程中保持均衡推进以减少前方移动支承压力对底板隔水层的破坏。实践表明:采取物探、钻探、注浆和均衡推进等综合防治水的方法能有效减少工作面底板的涌水量,降低底板承压水的突水概率;对三软煤层底板主要强含水层以上地层进行加固改造,可以提高底板岩层的隔水厚度和隔水性能,有效防治底板承压水。

Under the mining condition of water pressurized, in order to eliminate the danger of the floor pressurized water in the coal mining face, in combined with the floor water bearing and water isolated conditions in seam of Chaohua Mine in Zhengzhou Mining Area, the water inrush coefficient was applied to classify the floor water inrush danger area. With the physical exploration and drilling exploration, the distribution of the rich water zone was clarified. The grouting operation was made to the thin water bearing layer in seam floor in order to turn the water bearing layer to a water isolated layer. During the production period of the coal mining face, a forward speed of the coal mining face should be kept in a stable speed in order to reduce the failure of the floor water isolated layer by the front moving support pressure. The practices showed that the comprehensive water prevention and control method with physical exploration, drilling exploration, grouting and stable forward could effectively reduce the water inrush from the floor of the coal mining face and could reduce the water inrush probability of the floor pressurized water. The reinforced operation to the strata above the main water bearing layer for the floor of the seam with soft roof, soft coal and soft floor could improve the water isolated thickness and water isolated performances of the floor strata and could effectively prevent and control the floor pressurized water.