硬质围岩
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middle hard wall-rock 中硬围岩
hard wall-rock construction 硬质围岩施工
hard wall-rock
以上为机器翻译结果，长、整句建议使用 人工翻译 。
After several years to jumbolter research, the hard rocks always present in the soft ones in the wall rock procedure using jumbolter, which results in changing the boring tool during the procedure.
经过几年对锚杆钻机的跟踪研究，发现锚杆钻机在围岩作业中常遇到软岩中有硬岩夹层的现象，造成施工过程经常更换钻具的问题。
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