采空区坚硬顶板大面积冒落时巷道空气冲击波的计算

Calculation of Air Shock Waves in Roadway Induced by Large-scale Hard-roof Cave of Goaf

煤矿事故中,顶板事故占总事故的绝大多数,其中顶板大面积冒落时在工作面和巷道中所引起的空气冲击波加大了冒顶事故的危害。根据流体力学理论对坚硬顶板大面积冒落所造成的巷道局部风速、风力进行了理论推导和实例计算,结果表明,冒顶时巷道内单位面积承受的压力较大,放顶时应充分预测巷道内风力可能造成的危害,以减少事故伤亡。

Roof accidents took up a large portion of all accidents in coal mines.The air shock waves in working face and roadway induced by large area roof caving of goaf could cause tremendous harm.Basis on the theory of hydromechanics,In this paper,the formulas for calculating the wind speed and wind power in local place of roadway when large-scale hard-roof caving happens are derived,and a practical examples of calculation is presented.The results show that the force on per unit area of roadway is larger,so when forced top caving the forecast of probable hazards caused by larger wind power in roadway is necessary in order to cut down accident casualty.