The flexibility measures as well as the broken coal rejects and other soft bulk material set up on the top of the temporary support should be applied to reduce the impacts of the roof falling rocks.
必须采取柔性措施以及提前在临时支架上方堆积碎煤矸等松散材料降低冒落矸石冲击力；
The top 600 mm of the subgrade shall be formed using soft material.
顶部600毫米的路基，应使用软材料组成。
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