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目前,同煤集团井下准备巷道、区段巷道的顶部及两帮围岩,强度低、节理发育,稳定性差,围岩变形大,属于不稳定或极不稳定巷道。长期以来,此类巷道采用混凝土干喷技术进行加固支护,但是干喷技术存在一些缺点。干喷混凝土强度一般只有20 MPa.难以达到巷道稳定、安全的支护效果;‘施工中回弹率高达30%,材料浪费严重,增加了工人劳动强度;粉尘浓度一般为80 mg/m3~1 00 mg/m3,远远超过总粉
At present, Tongmei Group underground preparation tunnel, the top of the section of roadway and two groups of surrounding rock, low strength, joint development, poor stability, large deformation of surrounding rock, belonging to unstable or very unstable roadway. For a long time, this type of roadway using dry-shotcrete reinforcement support technology, but there are some shortcomings of dry-jet technology. The strength of dry shotcrete is generally only 20 MPa. It is difficult to achieve the stable and safe supporting effect of the roadway. The rebound rate in construction is as high as 30% and the material waste is serious, which increases the labor intensity of workers. The dust concentration is generally 80 mg / m3 ~ 1 00 mg / m3, far exceeding the total powder