Study on deformation and failure characteristics of roadway group in strong mining coal seam and bolting repair and reinforcement technology
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Abstract
Coal seam roadway group is easily affected by strong mining stress, resulting in severe deformation and failure of surrounding rock and serious failure of supporting structure.How to effectively control the stability of surrounding rock of coal seam roadway group is of great significance to guarantee the normal and safe production of mine.As the engineering background of a mining area coal seam roadway in coal mines of Wanjiazhuang Coal Mine, analyzes deformation and failure characteristics and influence factors of the strong mining roadway group, puts forward the comprehensive repair roadway group of “high strength integrated bolt-grouting” control technology plan, carry out the strong mining roadway group of grouting repair field industrial test and repair process and grouting effect, the monitoring analysis of bolt anchor cable force and deformation of surrounding rock.The results show that the large roadway group of strong mining coal seam presents a full-section deformation and failure mode under the superposition of strong mining stress on two wings working face.Compared with the ordinary bolt (cable) support, the maximum vertical displacement and maximum horizontal displacement of the surrounding rock of the roadway are reduced by 80.5% and 76.3% after the comprehensive restoration control scheme of “integration of high-strength bolting and grouting” is adopted.The deformation of surrounding rock is effectively controlled and the effect of field application is good.The research results provide a theoretical basis and engineering reference for the stability control of surrounding rock of large roadway group in strongly mined coal seams.
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