Determining the reasonable width of chain pillar of deep coal seams roadway driving along next goaf

For geological conditions of specific production of the deep coal seams roadway driving along next goaf,using the methods of theoretical analysis,numerical calculation and the combination of field and test,obtaining certain method of reasonable width of chain pillar of deep coal seams roadway driving along next goaf,which considering five aspects for the pillar width from distribution of stress of the section of the lateral support goaf,stress distribution of coal pillars,surrounding rock stress distribution,the relationship between deformation of surrounding rock and coal pillar width and the theoretical of the width of pillar,in particular,with the full consideration of the influence of the lower coal mining on the retain of the width size of the pillar upper roadway driving along next goaf.Field test results show that:the method of determining the coal pillar width is science and reliable,which provide a scientific basis for the reasonable width of deep coal seams roadway driving along next goaf pillar,improving difficult situation of deep roadway maintenance and raising coal mining rate.