地層分類
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巖層名稱
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研磨性
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鉆頭胎體系列
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HRC55
|
HRC
45-50
|
HRC
40-45
|
HRC
35-40
|
HRC
30-35
|
HRC
25-30
|
HRC
20-25
|
HRC
15-20
|
HRC
10-15
|
HRC
5-10
|
HRC
0-0-5
|
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
|
11
|
軟
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泥巖、頁巖、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
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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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●
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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
|
●
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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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|
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硬
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玄武巖、片麻巖、花崗閃長巖、角巖、偉晶巖、輝綠巖。
|
強
|
|
|
|
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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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●
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●
|
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堅硬
|
堅硬花崗巖、英礫巖、石英巖、硬板巖、流紋巖等。
|
強
|
●
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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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●
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