大采长高导深工作面回采巷道突水机理及防治技术

Water Inrush Mechanism and Control Techniques of Roadways on Working Face with Long Mining Length and Large Buried-depth

通过分析K2101工作面回采巷道内的水质和二2煤底板地质构造,得出了突水水源以及回采巷道底板扰动破坏机理。以"先探后掘、循环推进"的原则,在回采巷道掘进期间对浅部砂岩裂隙进行封堵,阻断与深部灰岩水的联系,防止裂隙导通发生突水。按照"二维立体布孔"原则,在工作面底板改造钻孔设计上对工艺进行优化,减少回采期间由于底板扰动浅部砂岩裂隙出水,同时阻断砂岩裂隙与深部灰岩间的水力联系。

By analyzing the water quality of K2101 workface roadway and plate tectonic of Ⅱ2coal seam,the water resource and failure mechanism of roadway floor disturbance were obtained. Sealing the shallow sandstone fissure was carried out during the roadway excavation as the rule ＂ first exploration after excavation,propulsion＂,to block deep limestone water contact and prevent the fracture water inrush. The process was optimized on the design of working face floor renovation drilling as the rule of ＂ two dimensional hole＂,whose purpose was to reduce the shallow sandstone fissure water due to the floor disturbance,and to block the hydraulic connection between the sandstone fissure and deep limestone.