用于中小规格冲击钻及旋转勘探钻具，凿进软岩层、中硬岩层。
For small rotary rock drill bits and rotary prospecting bits to cut soft, medium-hard rock.
现场试验结果表明，PDC锚杆钻头是钻进中硬岩层的理想钻头。
The results of field tests proved that PDC anchor bit is ideal in mid hard rock drilling.
主tpy - 30型钻机是一种液压浅孔物探普查钻孔机，该机主要适用于土层，沙土层和中硬岩层中的钻进。
TPY-30 drilling machine is a type of shallow-hole drilling machine for exploration, it is suitable for drilling in soil, sand soil and medium harden rock drilling.
在软硬相间的层状岩体中地应力分布很不均匀，应力大小与岩层硬度具有正相关性，硬岩中的水平应力大于软岩的水平应力。
The stress distribution is far from uniform in this stratified rock, the horizontal stress magnitude in hard rock layers is significantly higher the that in soft layers.
在软硬相间的层状岩体中地应力分布很不均匀，应力大小与岩层硬度具有正相关性，硬岩中的水平应力大于软岩的水平应力。
The stress distribution is far from uniform in this stratified rock, the horizontal stress magnitude in hard rock layers is significantly higher the that in soft layers.
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