Roadway Supporting Technicas On Top-caving Work Face In Fault Broken Zone Of Tunbao Colliery

The issue on surrounding rocks control in fault broken zone is premierlly needed to be paid more consideration when it terms to production safetily. Because of the influence of faults, the mechanical properties of roadway coal-rock changed, that severely restricts roadway stability and mining securitily.Taken 1193 working face roadways in falut broken zone of Tunbao colliery into consideration, the sophisticated analysis methods were here to study the supporting technics and deformation rule of roadway surface. Through site engineering geological investigation, we got much information about the spatial relationship between 1193 mechanized caving face and adjacent face. The lithology and physical mechanical properties of roadway surrounding rock were gathered from physical and mechanical experiments on surrounding rocks. With the help of Hoek-Brown criterion, roadway’s mechanical model was created to analyze the internal critical unstability range in roadway and its formular was derived. Taken the physical mechanical properties of surrounding rock in 1193 working face roadway into consideration, it is dedicated that the internal critical unstability range in roadway was 2.24 m. Through comprehensive site monitoring methods, the results are dedicated that larger deformation occurred at pillar side compared with the coal seam side; the influential range of dynamic pressure in 1193 working face is 34.0m and the peak value is 5.0m caused by superimposed stress, which includes faults additional stress and advanced bearing stress; it shown that the range reached 2.33 m at the coal seam side and 2.24 m at roof side. Finite element numerical simulation software-FLAC3 D was here to optimalize sectional coal size, when taken the site engineering geological investigation into consideration. Finally, through reansonable detection on influential range of dynamic pressure and internal critical destabilization range in fault broken zone, the supporting parameters were optimized after comprehensive comparison between mechanical analysis and in-site detection. Much more reasonable bolt, anchor, anchor net and other supporting materials were applied to maintain the safety in mining through fault broken zone. This new optimized supporting design was proposed to improve the surrounding rock’s own strength and fully realize its self-supporting capability in the roadways.Our research could not only ensure the safety in Tunbao mine but also provide a meaningful effect to other mines with similar geological situation.