To ensure the safety of small coal pillar excavation along the goaf,the width of the small coal pillar and the surrounding rock support scheme were determined for the 6302 transportation roadway as the engineering research object,and the engineering application was carried out.Through theoretical calculations,the width of the small coal pillar was determined to be 5 m.The transportation roadway adopted the anchor net cable spraying support method.On the basis of full section spraying,the roof was supported by"full anchor cable+steel mesh",and the roadway support was supported by"anchor rod+anchor cable+double-layer diamond mesh".At the same time,the small coal pillar support was reinforced by grouting.After on-site application,the control effect of surrounding rock in 6302 transportation roadway was significant,with the roof and floor and two sides moving within 90 and 160 mm respectively.Moreover,due to the reduction of coal pillar width,an additional 1.847×105 t of coal can be recovered from the mining face.The research results can provide experience and reference for the development of small coal pillar goaf excavation work in other mines.
关键词
沿空掘巷/煤柱宽度/围岩支护/注浆加固
Key words
roadway driving along next goaf/coal pillar width/surrounding rock support/grouting reinforcement
维普
万方数据