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新兴煤矿在以往施工过程中普遍采用单楔形掏槽进行爆破,掏槽眼一般布置在巷道断面的中部,循环进度一般在1.2～1.5m,易产生底高和底根现象,拉底时,两帮超挖、欠挖现象十分严重,而且底板易产生瞎炮、循环进度低、放炮次数多,造成安全隐患。为了解决上述问题,新兴煤矿2011年4月在掘进区10801掘进队施工的八采区三水平左二片46层回风道工作面进行底部复式楔形掏槽中深孔爆破技术试验,经过试验对比和摸索,取得比较好的效果。
Emerging coal mines in the past during the construction process commonly used single wedge cut for blasting, cut the hole is generally arranged in the middle of the tunnel section, the cycle progress is generally 1.2 ~ 1.5m, easy to produce the bottom height and the bottom of the root phenomenon, pull the bottom, the two To help over-dug, under-dig phenomenon is very serious, and the floor easy to produce blind artillery, low cycle rate, blasting frequency, resulting in security risks. In order to solve the above problems, the emerging coal mine in April 2011 in the driving area 10801 excavation team construction eight mining area three levels of the second floor of the 46 back to the first floor of the roadway complex bottom wedge cut deep hole blasting technology test, after a test comparison And explore, get better results.