Research And Application On Surrounding Rock Control Technology In Many Uphill Roadway Of Thick Coal In Deep Mines

Along with large scale development and utilization, the shallow coal resources less and less. Mine exploitation in our county is undergoing a from shallow to deep, geological conditions from simple to complex, deep mines coal increase gradually, the absolute amount addimg has the tendency of increase gradually. Requirements of mining area (band area) preparation roadway numbers (basal area enlarges) is increasing. As coal roadway bolting technology and mining green mining technology development and national environmental protection efforts to strengthen regulation, more and more district raises, transport tunnels and main return ways have been digged in coal seam. Therefore, the research of thick coal seam multiple district raise of surrounding rock control technology has important practical value.Based on the project"Multi Uphill Roadway Coordination and Control Technology in Deformation Mechanismof Thick Coal in Deep Mines"of Shanxi Luan Environmental Energy Development Co., Ltd Wu Yang coal mine, comprehensive use of computer numerical simulation and theory analysis, the laboratory test and field test and so on many kinds of research methods, systematically studied surrounding rock theory and control technology of multiple district raise in thick coal seam. The main content and the results are as follows:1. Under Confining pressure grading long load with triaxial compression experiments, results show that: confining pressure are smaller, less influence of specimen deformation, but with confining pressure increases, the influence of specimen deformation increased gradually. When the axial pressure is very large, only larger confining pressure could control specimen deformation. These laws up for the high stress thick coal seam by prestressed anchor cable supporting steels provides theoretical basis.2. Based on calculation of roadway section optimization analyzed, draw up the optimal size of district uphill roadway section.3. According to district raise surrounding rockmass deformation when tunneling of influence each other, put forward "multiple coordination and roadway deformation" concept. Through numerical simulation FLAC2D and peep detection technology of dynamic pressure tunnel strata,comprehensive research multiple coordination and roadway deformation in thick coal seam.At the same time, based on the numerical simulation of uphill roadway coal pillar width, getting stress with deformation regularity and reasonable coal pillar width of uphill roadway group.4. Puts forward the comprehensive reinforcing scheme which has already mixed high strength and high prestress bolt and anchor cable supporting and grouting technique in the rise entry which in high stress thick coal seam,the practice of supporting has achieved remarkable results in Wu Yang coal mine.