Research On Coal-Rock Movement Law And Drawing Technology For Fully Mechanized Caving Face Of Special Thick Coal Seam In The Anjialing No.2 Coal Mine

Based on the condition of fully mechanized top-coal caving of special thick coal seam in PingShuo coal mine combined open-pit with underground mining, and the analysis and summary of past research results, the paper has studied coal-rock movement law, strata behaviour features, drawing technology parameters for fully mechanized top-coal caving face of special thick coal seam in the condition of combined mining by theoretical analysis, similar simulation and filed observation and so on. By analyzing cover rock structure characters of special thick coal seam in fully mechanized caving face, The paper has educed caving zone strata has distributing character of irregularly and regularly caving, the strata above caving zone will form structure of Voussoir Beam, founded cover rock structure model, analyzed reasonable working resistance of support.By analyzing coal-rock moving together with drawing law and effect of drawing technology parameters for top-coal recovery ratio, the paper has educed that initiating-point of top coal reached as aggrandizement of drawing interval , and moving range of top coal aggrandized; after drawing ,the boundary between coal and rock appeared mutation ,formed stepped ,as aggrandizement of drawing interval, appeared more mutation points on the boundary between coal and rock, furthermore holistic slope of the boundary between coal and rock minished ; the paper confirmed reasonable drawing technology parameters(drawing interval is 1.6m and drawing pattern is double round caving in order).Finally, combining research conclusions with the engineer practice of the AnJiaLing NO.2 coal mine, observation results prove the results correct, and good technique and economical effects are obtained.Thesis includes fifty-four figures, twenty-two tables and fifty-nine references.