There is a certain angle between caving line and coal seam strike.
垮落线与煤层走向是一定角度。
In the light of analogue test in laboratory, the stability of roof of fully mechanized working face with top coal caving is studied during withdrawing support at stop line.
通过实验室相似模拟试验，对综放面收尾撤架空间的顶板稳定性进行了研究。
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