Along with mining depth becoming deep and coal output increasing, the gas discharge increased, and gas problem of primary mining in coal face becomes important.
随着采煤深度的下延和产量的加大，瓦斯涌出量逐步增加，采煤工作面初采期间的瓦斯问题越来越引起重视。
The paper also points out the measures for increasing coal output and the principle for determining reasonable caving interval.
提出了破坏“拱”平衡，增加顶煤放出率的措施和确定放煤步距的原则。
The operating cost is greatly reduced at the same time of increasing the output of coal powder.
在提高煤粉台时产量的同时，大幅度地降低运行成本。
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