Technical Research Of Once Mining Full Height Of 21m Coal Seam In Fully-Mechanized Top Coal Caving

In the face of self-ignite extraordinary of Ma Ti Gou Mine, in order to discharge whole 21 meters top coal. In this text we have studied deeply physical property and mechanical property of coal layer and surrounding rock by using lab examination, computer simulation and equivalent material simulating test We have studied coal's explode performance and parameter, bearing pressure and regularities of distribution around workplace, slope's surrounding rock transfer law ,top coal breakage and law of motion, mining parameter and mining way. Make sure of mine setting, rule of rock thrust and main pressure parameter in special geologic setting of Ma Ti Gou Coal Mine. And summarize geostatic appearance disciplinarian through laneway displacement measure, stress measurement etc. This work provide a theoretics reference for decompression and support design. Through surrounding rock naturalness softening research principle, we find out reason of naturalness softening. So we can make a choice for depressurization and softening scheme. And for the first time we bring firward theory of depressurization with anchor eye. This theory establish foundation for anchor shoring in high ground pressure and rockburst.Through research of this text,we have thoroughly solved way of mine Ma Ti Gou Coal Mine and for a long time continuance tension layer mining be on fire serious coeffinceint of recovery lowness and output in low-level,benefit and efficiency in low-level,sovled technical problems and ensure mine regular production.