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煤层的顶底板岩层分为伪顶、直接顶和( )

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2021-09-02 15:22
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老顶

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按顶板与煤层相对位置及垮落难易程度,可将煤层顶板分为伪顶、()、和老顶。
煤层开采引起回采空间周围岩层应力重新分布,还会向底板深部传递,在底板岩层一定范围内( )
煤层的顶底板岩层分为伪顶、直接顶和( )
在缓倾斜特厚煤层中,沿煤层底板布置一个长壁工作面用综合机械化方式进行回采,并辅以矿山压力的作用或以人工松动方法,使工作面上方的顶煤破碎,在工作面支架后方(或上方)放落,并运出工作面。这种采煤方法称为。
伪顶是指直接覆盖在煤层之上的()。
每个煤层都可分出伪顶、直接顶、老顶。()
煤层的顶板根据是否容易垮落和距离煤层远近分为伪顶、()和基本顶。
什么叫煤层的顶底板?
煤层煤样采取范围包括伪顶和()。
伪顶是指直接覆盖在煤层之上的薄层岩层。
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赋存在煤层之上的邻近岩层叫煤层的底板。()
直接接触煤层底板的岩层叫煤层直接底。
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