Research on Physical Similarity Simulation of Mining Uphill and Downhill at the Large-Angle Working Face

Abstract

With the development of coal mining and the continuous expansion of mining intensity, large dip angle comprehensive mechanized coal mining as an important development direction and goal has become a worldwide research topic in the coal industry.Theworkingfacefacesmanyproductionproblemsthatneedtobesolved,suchasthelarge-angledownhillmining,the large-angle uphill mining, and other complicated geological conditions (such as skew, anticline, and fault). In view of the above problems, with the specific conditions of Xinji No. 2 Mine, through the physical similarity simulation, the research on the roof movementlawofthefullymechanizedminingfaceundertheminingconditionsoflargedipangle(depressionangleandelevation angle are more than 40° and 20°, respectively) is studied. The distribution law of abutment pressure, movement law, and distributionrangeofwater-conductingfracturezoneafterminingareemphasized.Meanwhile,thepaperanalyzesandcompares therelatedminingpressurelawofinclinedlongwallfullymechanizedminingfaceundergeneralconditions,formingasystematic, comprehensive, and scientific understanding of the law of mining pressure under such conditions. This achievement is of great significancetothepreventionandcontrolofwater,supportdesign,safetyproduction,environmentalimprovement,improvement of enterprise efficiency, and advancement of coal science and technology.