采空区顶板动态补给水预疏放设计

Design of Pre-drainage of Dynamic Recharge Water in Roof of Goaf Area

为保证工作面安全回采,通过对南凹寺煤矿的水文地质条件与地层特征进行分析,以30405工作面采空区为例,对涌水量的不同充水条件和充水量进行预测分析,建立数值模拟的分析模型,找到涌水量与回采推进度的内在联系与相关规律,并采取两巷提前施工放水钻孔的方式,有效控制疏放顶板静态积水,减少对采空区的积水量补给,通过平行作业方式,缩短放水周期。

In order to ensure the safe mining of the working face,through the analysis of the hydrogeological conditions and stratum characteristics of Nanaosi Coal Mine,taking the goaf area of the 30405 working face as an example,the prediction and analysis of different filling conditions and filling capacity of water inflow are carried out,the analysis model of numerical simulation is established,the internal relation and related law between water inflow and mining pushing progress are found,and the way of water discharge drilling in advance of two roadways is adopted.Effectively control the static water accumulation of the roof,reduce the recharge of accumulated water to the goaf area,and shorten the water discharge cycle through parallel operation mode.