...¢jyj íÃü 关键词：采矿工程；厚硬岩层；压缩量；交错布置 [gap=1774]Key words：mining engineering；hard-and-thick strata；compressed volume；staggered layout ...
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厚硬岩层
Hard rock
以上为机器翻译结果，长、整句建议使用 人工翻译 。
张双楼煤矿主采煤层为7煤和9煤，两层煤之间赋存唯一一层厚硬岩层，即9煤层的直接顶也是7煤层的直接底。
The hard-and-thick strata ACTS both as the floor of coal seam No. 7 and as the roof of coal seam No. 9 in Zhangshuanglou coal Mine; and coal seam No. 9 is also hard.
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