论文部分内容阅读
我矿255上风道,是1989年5月掘完的,风道全长820m,断面10.4m~2,采用拱形棚支护。当时运输道,切眼还未开始施工。全负压通风系统没有形成,故将已掘完的255上风道用密闭隔绝。1990年11月上旬,下运输道开切跟已到位,需与风道贯通,由于255上风道密闭已17个月之久,启封探测其瓦斯浓度高达37％,氧含量最低为3％。沼气浓度达到5％～16％,氧含量高于12％时,遇火会引起爆炸。故在瓦斯排放前,运用事故树分析的方法,采取了相应的有效对策,避免了在瓦斯排放过程中重大事故的发生。
I mine 255 on the air duct, dig in May 1989, the wind tunnel full-length 820m, section 10.4m ~ 2, the use of arched shed support. Transport Road at the time, cut eye has not yet started construction. Full negative pressure ventilation system is not formed, it will have to dig finished 255 on the air duct with airtight isolated. In early November 1990, the lower transport lane was opened and cut off. It had to be connected to the air passage. Since the upper air passage was sealed for 17 months, the gas concentration of up to 37% and the lowest oxygen content of 3% were detected. Biogas concentration of 5% to 16%, oxygen content higher than 12%, the case of fire can cause an explosion. Therefore, before the gas is discharged, the method of accident tree analysis is adopted and corresponding effective measures are taken to avoid the occurrence of major accidents during gas emission.