煤矿特大突水原因分析与通道探查技术

Analysis of heavy water inrush and the technology of channel exploration

矿井突水灾害严重威胁煤矿的安全生产，有效防治矿井水害对煤矿安全具有特殊意义．文章以某矿工作面运输巷掘进期间特大突水事件为背景，从矿井开采实践、奥灰水位变化和水质分析结果3个方面综合确定此次突水水源为奥灰水，并根据突水实际情况，分析可能引起此次突水的导水构造，针对突水通道探查的难点制定了相应的通道探查方案．探查结果表明，2#煤层底板以下存在一条落差为120m的正断层，使得煤层底板与下盘奥灰含水层的间距不足30m，剩余隔水层的厚度和强度均不足以抵抗高压奥灰水，致使巷道掘进期间，高压奥灰水突破巷道围岩，发生奥灰特大突水灾害．

Mine water inrush has threatened the mine production seriously, and the effective prevention and treatment of mine water inrush have special significance for coal mine safety. This paper takes the working face of a mine as an example, in which ordovician water inrush occurs during roadway excavation in coal seams. Based on the mining practice, this paper uses the ordovician limestone water level change and water analysis results to determine the water source, which is ordovician limestone water. Combined with the actual situations, this paper analyzes the possible causes of the water inrush and makes the channel exploration program. Through a comprehensive analysis of the water inrush data and exploration results, there is a fault under 2# coal whose 120m large height of drop makes the seam floor and footwall ordovician aquifer less than 30m. The strength and thickness of remaining impermeable layer floor are insufficient, so it cannot stand the high pressure ordovician limestone water. At last, the water inrush occurs during roadway excavation.