Study On Subject Regularity Of Underground Pressure Behavior Of 14202 Fully Mechanized Face In Zhang Jiamao Coal Mine

Zhang Jia Mao coal mine at the border zone of the Shenfu Jurassic coalfield local mining area,belongs to the shallow buried coal seam.This kind of coal seam full mechanized mining face in initial stage of mining iron ore and the pressure performance of the most obvious,has for the safety of the working face production process produced certain influence,the to be Zhang Jia Mao ore 14202 fully mechanized coal mining face of Mine Pressure Regularity launches the discussion.Aiming at the occurrence characteristic of 14202 face in shallow thinner seam of Zhang Jiamao mine.According to theory analysis reach the conclusion that it's a typical shallow seam and then the behavior of strata-pressure and its affect factors of the face were studied.The law of roof activities and the distribution of strata supports resistance are gained by analysis of on in-situ observation data.Based on the theory analysis,a mechanics model of main roof in large mining height long-wall fully-mechanized working face is established.according to this mechanics model,the formula of breaking spans of main roof is put forward,and the proper working resistance of supports is estimated.Some measures to control roof and methods to prevent face spalling are advanced.Combined with results,this paper proposed the corresponding preventive measures which had got good application of 14202 work face of Zhang Jiamao coal seam and provided a certain theoretical research and reference for exploiting under the conditions similar to thin bedrock.