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一是煤层赋存与开采条件简单,自然灾害威胁小。美国现有煤矿1600余处,其中的900多处井工煤矿基本为低瓦斯矿井,开采深度一般在200-3 00米,不存在煤与瓦斯突出危险,自然发火及水害的威胁小。2014年,美国煤矿生产煤炭10亿吨,事故死亡16人,百万吨死亡率0.016。同时美国煤矿采取对地质条件复杂、灾害严重、现有技术
First, the occurrence and mining conditions of coal seam are simple and the threat of natural disasters is small. There are more than 1,600 coal mines in the United States, of which more than 900 wells are basically low-gas mines with a depth of 200-300 m. There is no danger of coal and gas outburst, and the risk of natural fire and water damage is small. In 2014, the U.S. coal mines produced 1 billion tons of coal, with 16 fatalities and a million-tonne fatality rate of 0.016. At the same time, coal mines in the United States have taken on the complex geological conditions, serious disasters, the existing technology