论文部分内容阅读
湘潭锰矿井巷工程大部分开挖在中硬(f=6～8)的灰绿色板岩和砂岩中。近几年来已广泛应用喷锚支护,而光面爆破是喷锚的基础,进行光面爆破势在必行。1980年我矿采用了导爆管非电起爆系统新技术,在井巷掘进光面爆破中进行了初步尝试,效果良好。 (一)光爆的炮眼布置巷道掘进断面为2.5×2.65米。采用直线菱形掏槽,孔深一般为1.6～1.8米,孔径42～43毫米,眼数为30～32个。周边炮眼密集系数K为:
Most of the Xiangtan manganese mine shaft and shingle projects are excavated in gray-green slate and sandstone with moderate hardness (f = 6 ~ 8). Spray anchor support has been widely used in recent years, and smooth blasting is the basis of shotcrete anchor. Smooth blasting is imperative. In 1980, the mine adopted a new technology of non-electric detonating tube detonating tube, and carried out a preliminary attempt in the smooth blasting of shaft tunneling with good results. (A) light burst hole layout roadway excavation section 2.5 × 2.65 meters. Using a straight diamond cut, hole depth is generally 1.6 to 1.8 meters, 42 to 43 mm aperture, the number of eyes is 30 to 32. Peripheral blasthole intensive coefficient K is: