Study on Support Technology of Mine Roadway with Weak Cemented Sandstone in Lignite Mining Area

In order to solve a high deformation problem of a mine weak cemented sandstone roadway in lignite mining area, based on the geomechanics test, comp osition analysis on the clay mineral and the study on the bolting test, a powerful pressure bearing arch, time support of the full cross section, full length pre- stress bolti ng, powerful surface protection, pre- stress effective spreading and other roadway support principles were provided, a single powerful bolt I steel mesh 1 anchor support of the mine weak cemented sandstone roadway in lignite mining area was realized. The results showed that the high pretension powerful bolt support system could elim inate the timber square support, reduce the support cost and the labor intensity. The integrated convergence of the mine roadway was controlled within 3%. The max co nvergence between the two sidewalls was 55 mm and the max convergence between the roof and floor was 38 mm.