1413A Floor Surface Mining Deformation Failure And Water Prevention And Control

Coal industry is the pillar industry of national economy development in our country,large reserves, wide distribution, great variation in geological conditions, especially in recent years in large mining depth, mining under complicated geological conditions more aquifer, high water pressure, etc., and by water damage and the threat of more prominent influence, control water situation is more severe, so be floor water hazard control techniques is essential. In order to achieve safe and efficient coal resources exploitation,the paper Zhangji mine 1413 A Face for the study, carried out research on coal mining floor deformation and failure of law and Flood Control Technology. Zhangji mine based on drilling data mining, geophysical exploration results, 3D seismic exploration, high-power frequency electromagnetic prospecting information etc, on-site experimental observations,numerical simulation, theoretical analysis, physical and mechanical tests and mechanical theoretical research methods, work for mining surface mining floor rock stress and deformation and failure evolution, floor water damage threat level, prevention and treatment of water main technical route of a feasibility study. The main results are as follows:(1) Zhangji mine 1413 A Face has limestone aquifer from the past, to withstand high water pressure, large thickness of coal seam mining, large roof sandstone thickness, high strength characteristics significantly, and the presence of lead water FS866 boundary fault.Therefore, mining more difficult by the high degree of threat to water damage.(2) For the 1413 A Face features, analysis and comparison, the use of long boreholes drilled short and wear layer combining rapid drainage technology to reduce the working face water inrush coefficient, improve safety and reliability of mining face.(3) Based on elastic-plastic mechanics, fluid mechanics and mine pressure theory to study the working face during the excavation process on floor strata deformation and destruction. On the basis of engineering practice, all of the fall of longwall method to calculate the depth of coal seam floor damage, stress and deduced bottom floor failure depth empirical formula.(4) Analysis of the test face floor rock mechanics parameters, set up Face engineering geological model, numerical FLAC3 D application software to simulate a standard rock containing at fault in two different geological structure 1413 A Face in promoting 20 m,40m, 60 m, 80 m, 100 m, 120 m, 140 m maximum principal stress cloud bottom position, the shear stress cloud and plastic zones map, determine the deformation and failure under thelaw and bottom seam excavation floor strata failure depth of the maximum value of the simulation results, with the result deduced floor failure depth empirical results are basically the same, to use the project to provide technical support, it has an important reference value for water inrush prevention and control technology of the coal seam.(5) In accordance with effluent water, water temperature, water quality and water level variation analysis on C33 No. 1 bedding hole anomaly Cause and water channel results show that: the water source is Ordovician and Cambrian limestone mixed water,drilling construction drilling holes due to sinking deflection expose deep C39 the following high pressure and rich water zone causing abnormal water drilling, with the C33 vertical guide structure independent of the water;(6) To achieve security and limestone mining coal seam water damage prevention,and grouting technology in basic research on the characteristics of water conductivity fault empirical formula and method for projecting water system faults on Face Threat briefly security Assessment analysis.(7) Face value parameter based on pressure and blood pressure after hydrophobic, are calculated Face floor failure depth and water inrush coefficient, calculated floor failure depth of 21.03 m, 1413 A face floor water inrush coefficient 0.004MPa/m to 0.025MPa/m,bottom water bursting coefficient in this range are less than projections by structural damage to critical water-block value 0.06 MPa / m. Standard rules of order, and therefore,the possibility of 1413 A mechanized mining face water inrush is small, with safe mining conditions.(8) Combined Zhangji Mine hydrogeology and mining conditions proposed 1413 A face floor water hazard prevention and control technology measures and countermeasures.