Study On Roof Disaster Pre-warning Of Large Ming Height And Super-long Working Face

Study on roof disaster pre-warning of large and ming height super-long working face is a scientific research project in Shanxi Province (200631118-02) and the National Support Program (2007BAK29B02) continuous monitoring of security status of mine roof and disaster pre-warning system against the background of the study, combined with SHENDONG GROUP, commissioned to "research on mining technology of 7m mining height " project proposed. Disaster pre-warning and prevention of 7m mining height and 300m working face is the practice of mining engineering to solve an urgent need encountered in the major engineering problems, which related to previous but not a fundamental solution. The research can form a major breakthrough in the forefront of the field. In this paper, based on the site investigation and summarize a lot of relevant information in the SHENDONG thick seam mining geological conditions, Integrated use of coal mining science, strata control theory, mechanical and other means, using theoretical analysis, numerical calculation and field methods, Developed a software system which can continuous monitor the state to mine roof safety and warn the disaster. Analyses of roof disaster, and make a warning and gives the control measures. Through research we get the following conclusions:1) Based on the engineering background of BULIANTA coal mine three zones 2-2 coal seam, DALIUTA coal mine three zones 5-1 coal seam and SHANGWAN coal mine one zone of 1-2 coal seam, figure out the reserves and coal seam characteristics more than 7m thick coal seam mining, for SHENDONG Mine more than 7m thick coal seam and the roof structure of rock occurrence conditions, from the improve resource recovery rate, the amount of roadway construction, safe and reliable and whether the high yield and efficiency point of view, choose the best The extra-thick seam mining methods.2) Through the long face of large mining rock pressure observation, summarized Mining rock pressure super-long working face the rule, and analyzes the reasons for large mining guide selection of high-powered support.3) The establishment of O-X-type collapse of the roof with hurricane prediction theory model, a large-scale collapse of roof with OX-type hurricane of the differential method to predict the air out of roadway when roadway instantaneous velocity in the air, taking along the way resistance, given the speed of air tunnel formula for calculating the impact load.4) Analysis of the security status of coal mine roof in a continuous monitoring and disaster warning system research background, research projects have found problems in research and development of the project to see the trend of clear roof of the main content monitoring studies and monitoring of the sensor layout mode to establish security status of coal mine roof continuous monitoring and disaster warning system to achieve objectives, defines the dynamic monitoring system, roof structure and composition, the preparation of stope supports load analysis algorithms and procedures to address the key technology for early warning, command of the actual production and provide a reliable basis.Thus, the large mining height 7m and 300m super-long working face attempt to scientific and technological development for the mining industry have a significant engineering application value and promote the meaning and role in promoting the development of the mining disciplines, not only enrich the big mining disasters, the high roof long face mining pre-warning and prevention theory and practice, while for the SHENGDONG mining thick coal seam of coal resources to improve the recovery rate has important practical value and significance.