Table 11 The test results of rock CERCHAR abrasion.

From: Adaptability evaluation model and experiment of full section SBM in deep strata based on AHP-fuzzy theory

Coring depth(m)

Lithologies

Test number

Observation angle(°)

Measured value(mm)

Average value(mm)

CAI(0.1mm)

Abrasion level

50

Sandstone

C-1

0

0.1220

0.1221

1.126

Medium

120

0.1198

240

0.1244

C-2

0

0.1407

0.1467

120

0.1484

240

0.1509

C-3

0

0.0657

0.0690

120

0.0732

240

0.0682

100

Carbonaceous shale

A-1

0

0.1282

0.1132

0.947

Slightly low

120

0.1031

240

0.1083

A-2

0

0.0532

0.0562

120

0.0596

240°

0.0559

A-3

0

0.1158

0.1148

120

0.1125

240

0.1161

150

Granodiorite

I-1

0

0.1469

0.1458

1.411

Medium

120

0.1436

240

0.1469

I-2

0

0.1438

0.1580

120

0.1591

240

0.1712

I-3

0

0.1000

0.1196

120

0.1294

240

0.1294