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1 引言长壁开采法在60年代引入澳大利亚,最近几年采用此方法愈来愈多。在新南威尔士矿井所生产的煤中50％以上来自长壁工作面。一些长壁工作面每天可产6000t煤。但是长壁工作面产量和效率的提高也增加了粉尘问题。在新南威尔士矿区的20个工作面中有8个采用长壁开采法,这些工作面通常不符合煤矿最大允许粉尘含量3mg/m~3的规定。在新南威尔士的3个矿井中所进行的现场调查结果表明,虽然采煤机是产生粉尘的主要来源,但是许多情况下,相当一部分粉尘是由
1 Introduction Longwall mining was introduced to Australia in the 1960s and has been used more and more in recent years. More than 50% of the coal produced in New South Wales mines comes from longwall work surfaces. Some long-wall face can produce 6000t coal a day. However, the increase in production and efficiency of longwall faces has also increased the dust problem. Eight of the 20 facets in the New South Wales mining area use longwall mining methods that normally do not meet the maximum allowable dust content of 3 mg / m3 for coal mines. Field surveys conducted at three mines in New South Wales show that while shearers are the main source of dust generation, in many cases a significant portion of the dust is caused by