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There used to be igneous intrusions into coal measures and overlying strata in the Hanxing coalfield.
邯邢煤田煤系及其上覆地层中常有岩浆岩侵入体穿插.
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This paper introduces the moving law of overlying strata and top - coal in full - mechanizedbrawing coal model test.
介绍了模拟综放开采覆岩及顶煤的移动规律.
Influences of overlying strata failure height of different exploitation methods, programs and geography terms are analyzed.
分析了不同开采方法及开采程序、不同地质条件对覆岩破坏高度的影响.
上覆岩层???煤层或采掘空间之上的岩层。???
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