邯邢矿区深部煤层底板突水机理研究

Study on floor water inrush mechanism of deep seam in Hanxing Mining Area

为探讨大采深高承压水条件下煤层底板的突水机理,通过分析邯邢矿区底板突水的特征,从岩石结构及地下水动力及线弹性断裂力学等方面研究入手,首次提出了"分时段分带突破"的煤层底板突水机理。从空间上,将上组煤2号主采煤层至煤系基底奥灰强含水层之间,以薄层灰岩含水层为界划分4个隔水地质单元,按阻水能力将煤层底板岩体划分为11个阻水带,构建了6种底板突水模式,解释了高承压水从底往上逐带突破的物质基础条件;从时间上,将煤层底板渗水及突水通道形成进程划分为4个时段,确定了每个时段的界定条件。结合岩体力学分析,给出了底板突水综合判别式,为防控底板"分时段分带突破"突水进程提供决策。

In order to discuss the water inrush mechanism of a seam floor under conditions of deep mining depth and high pressurized water,with an analysis on the floor water inrush features of Hanxing Mining Area,from a study on the rock structure,underground water dynamic,linear elastic fracturing and other mechanics,the paper firstly provided the water inrush mechanism of the seam floor with ＂ time sections and divided zone breaking＂. From the space,there were four water isolated geological elements divided the aquifer in the thin limestone between the No. 2 seam of the main mining seam in the top group seam and Ordovician limestone aquifer of the coal measure floor. Based on the water resistance capacity,the floor rocks of the seam were divided to 11 water resistance ＂ subzones＂,there were six floor water inrush models established and the material basic conditions to make the high pressurized water breaking through each zone from bottom to the top were interpreted. From a view of the time,the process to form the seam floor seepage and water inrush channel was divided to four ＂ time-sections＂ and the certain condition of each time section was defined. In combination with the mechanics analysis,a comprehensive discriminant of the floor water inrush was provided in order to provide the decision to prevent and control the water inrush process with ＂ time section and subzone breaking through＂.