Dingji Coal Mine1272(3) Large Mining Height Mine Pressure Regularity Characteristics Under The Condition Of Different Working Face Length

This paper, taking huainan mining group,1272(3) the geological report of coal mine and the mine pressure observation data as the foundation, Using the key strata theory analyzes the key distribution of overburden rock and its influence on mine pressure appear. Using FLAC3D numerical simulation software to build different cut the length of working face mathematics model, analysis due to the change of the working face length of working face strata movement characteristics of coal wall stress, the characteristics of the plastic zone distribution. Combined with butyl working face1272(3) working face coal mine pressure observation data, the analysis of working face for the first time to distance of first weighting and periodic weighting interval, its support working resistance during and in the process of working face face support pressure distribution characteristics. Draw the hydraulic support working resistance in the process of working face advancing contour map, hydraulic support working resistance of data compared with the results of numerical simulation, analyzed the characteristics of the mine pressure appear along the working face layout direction. According to the hydraulic support working resistance in the process of working face mining, assessment to evaluate the adaptability of hydraulic support, provide theoretical support for DingJi of coal mine production.Combining with the research achievements of predecessors in the working face with large mining height, this paper expounds the working face the characteristics of the mine pressure appear.