采空区下工作面覆岩破断规律分析及矿压观测

Analysis of Overburden Rock Breaking Law and Ore Pressure Observation of Working v

为掌握顶板提前被破坏的采空区下工作面覆岩破断规律及来压规律,本文以3煤041699工作面和3下煤041699(下)工作面为近距离煤层原型,通过物理模拟及现场矿压观测。结果表明,041699(下)工作面平均破断距为9.75m,破断时平均工作阻力为39.8MPa,工作面整体周期来压弱且基本顶破断间距小,随采随落,各测点基本顶断裂情况存在较大差别,最少14次,最多19次。

In order to master the overburden breaking law and pressure law of the lower working face of goaf where the roof is destroyed in advance,This paper takes the 3 coal 041699 working face and 3 lower coal 041699(lower)working face are taken as the prototype of short distance coal seam.Through physical simulation and in-situ ore pressure observation,the results show that.The average breaking distance of 041699(lower)working face is 9.75 m,and the average working resistance is 39.8 MPa when breaking.The overall period of the working face is weak and the basic top breaking distance is small.With mining and falling,there is a great difference in the basic top fracture of each measuring point,at least 14 times,at most 19 times.