main roof
1.Taking the first coal face 1242(1) in Xieqiao coal mine as an example, the paper analyzes the regularity of strata behavior for fully mechanized working face,moving regularity of roof,performance and adaptability of hydraulic support and abutment pressure distribution of roadway.Meanwhile,the characteristic of support load during first and periodic weight of the main roof was studied.All these supply valuable experiences for extracting 11-2coal seam.
6.In order to determine gas content accurately in Seam 3 of Chengzhuang Coal Mine, qualitative and quantitative analysis in terms of seam thickness, metamorphic grade, burial depth, roof and floor lithologic characters, hydrological conditions and geologic structure proves that the thickness of the overlying bedrock was considered to the main control action factors to gas content, based on coal geologic data and actual gas emission data integrating with region tectonic evolution characters.
