适用于轻型回转钻机钻进软岩、中硬岩、硬岩等各类地层，钻头采用多点破碎，效率较高。

For soft rock, the hard rock, hard rock and other strata, multi-point drill bit broken efficient.

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首次在硬岩矿山采空区评价中引入综合模糊评价理论，建立了采空区灾害危险度多因子评价模型。

Fuzzy integrated assessing theory was used in hard rock mine goaf for the first time and multifactor assessing model for goaf hazard degree was also constituted.

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而合理的硬岩巷道中深孔掘进爆破参数则一直是需要研究解决的技术难题。

But appropriate the blasting parameters of medium deep blasting in hard rock tunnel is always a technical problem need to be solved.

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