Selected analysis of parameters of main roadway bolt supporting in 11th panel No.4 coal seam in Jinjiazhuang coal mine

According to the theory of strength enhancement for the rocks surrounding roadway supported by bolt,the authors introduce the geological conditions of surrounding rocks,and who build the mathematic model to define the general parameters and other parameters of bolt supporting.In the end,the authors tested the effects of bolt supporting,and have made the conclusions what were successful by bolt supporting.