地層分類(lèi)
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巖層名稱(chēng)
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研磨性
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鉆頭胎體系列
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HRC55
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HRC
45-50
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HRC
40-45
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HRC
35-40
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HRC
30-35
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HRC
25-30
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HRC
20-25
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HRC
15-20
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HRC
10-15
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HRC
5-10
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HRC
0-0-5
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1
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2
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3
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4
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5
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6
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7
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8
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9
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10
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11
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軟
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泥巖、頁(yè)巖、很軟的砂巖、泥炭巖、泥質(zhì)巖、火山巖、凝灰?guī)r等。
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強(qiáng)
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●
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●
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●
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●
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中
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●
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●
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●
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●
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弱
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●
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●
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●
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●
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中硬
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石灰?guī)r、流紋巖、安山巖、大理巖、 硬砂巖、褐鐵礦、白云母、片巖等。
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強(qiáng)
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●
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●
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●
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●
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●
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●
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中
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●
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●
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●
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●
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弱
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●
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●
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●
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●
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硬
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玄武巖、片麻巖、花崗閃長(zhǎng)巖、角巖、偉晶巖、輝綠巖。
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強(qiáng)
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|
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●
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●
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●
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●
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●
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中
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●
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●
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●
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●
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弱
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●
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●
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●
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●
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堅(jiān)硬
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堅(jiān)硬花崗巖、英礫巖、石英巖、硬板巖、流紋巖等。
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強(qiáng)
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●
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●
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●
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●
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●
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●
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●
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中
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●
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●
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●
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●
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●
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●
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弱
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●
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●
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●
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