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八街铁矿矿体为褐铁矿围岩为板岩。围岩普氏硬度f=1.8～5,节理发育,风化破碎,有些地段渗水外流,掘进坑道断面2.0×1.8米~2,极易冒顶塌邦,经常因支护问题被迫停掘或绕道掘进。支护工作成了掘进中的关键。针对这一问题,在矿党委的领导下,组织了“三结合”的喷射混凝土支护试用小组,开展了这项试验工作。先在沙厂工区二中段东沿、西沿喷射了将近100米平巷,其中有50米是将原有已腐的木
The eight-lane iron ore body is limonite surrounding rock is slate. Surrounding rock Prussia hardness f = 1.8 ~ 5, joint development, weathering and crushing, seepage and outflow in some areas, tunneling section 2.0 × 1.8 m ~ 2, prone to fall top collapse state, often due to support problems are forced to dig or detour tunnel . Support work has become the key to driving. In response to this problem, under the leadership of the coal mine party committee, organized a “triple combination” of shotcrete support trial group to carry out the pilot work. First in the sand factory area two east along the west along the jet spray nearly 100 meters Lane, of which 50 meters is the original rotten wood