Taking the mining of 23203 working face of Zhuanlongwan Coal Mine in Ordos as the engineering background,the continuous-discontinuous numerical simulation and theoretical calculation method were used to study the migration law of overburden and the characteristics of mine pressure behavior under continuous mining of shallow-buried and thick coal seams widely distributed in Northwest China.The results are concluded as follows.Firstly,when a shallow-buried coal seam with a depth of 200 m and a thickness of 4.81 m is mined continuously and rapidly at full height,its base-load ratio J z is greater than 1 and there are three key layer structures.Secondly,there are three types of self-stable structures in the overburden strata of shallow-buried stope under continuous mining,and the periodic fracture of each self-stable structure affects each other.The third periodic collapse form of the direct roof transforms the masonry beam structure into the cantilever beam structure.Thirdly,the measured working resistance value of support during the mining period of the multi-key layer structure working face is mainly between 11 000 kN and 16 500 kN,with an average value of 14 077.20 kN,which verifies the rationality of numerical simulation,theoretical calculation and support selection.The research results can provide important scientific basis for safe mining and support selection of shallow thick coal seam.
关键词
浅埋厚煤层/多关键层结构/覆岩运移规律/连续-非连续数值模拟/支架工作阻力
Key words
Shallow-buried and thick coal seam/Multi-key layer structure/Overburden migration law/Continuous-discontinuous numerical simulation/Working resistance of support
维普
万方数据