Services: Rock testing
Back to Search
Test Method Title
Drillability Test Suite
NTNUs 13A-98 Drillability Test Methods & SINTEFs Standards
Drilling Rate Index, Bit Wear Index, Cutter Life Index, Flakiness, Brittleness Value, Siever's J-Value, Abrasion Value, Abrasion Value Cutter Steel
Description of Test
The Drillability tests produce reliable predictions of TBM performance. The test method determines Drilling Rate Index, Bit Wear Index, Cutter Life Index. The indices are indirect measures for the drillability of rock in tunneling and rock excavations.
Preferred Test Sample Size
Rock core specimens
Number of Test Specimens
Test Specimen Size
15 - 20 kg preferred; minimum simple size 10kg of rock core
Drillability, NTNU, Drilling Rate Index, Bit Wear Index, Cutter Life Index
The trademarked acronyms and terms DRI™, BWI™, CLI™, SAT™, Drilling Rate Index™, Bit Wear Index™, Cutter Life Index™ and Soil Abrasion Test™ are unique for test results and calculated indices originating from NTNU/SINTEF and can only be obtained by testing samples at their reference laboratory in Trondheim, Norway.
For more information, contact GeoTesting Express: