Besides geological features, engineering properties such as uniaxial compressive strength (UCS), Brazilian tensile strength (BTS), brittleness and abrasiveness of the rock have significant affect on cutability and excavability of rocks. In this study, relationships between some engineering properties of rock and the normal force acting on the disc cutter are investigated. The research was performed at Earth Mechanics Institute (EMI) in the Colorado School of Mines, USA. The study is conducted on metamorphic through magmatic originated rocks. These rocks are granitic orthogneiss, horn-bio orthogneiss, meta-dolerite, meta-andesite, granitic gneiss, para-gneiss, calc silicate. Total 10 different rock block and related cores were collected from tunnel sites. 10 linear cutting test (LCM), 5 UCS, 5 BTS, 3 punch penetration test (PI) that used for brittleness investigation, and 2 Cherchar abrasiveness test (CAI) were performed on the collected rock cores. According to the ASTM (American Standard for Testing Materials) standard, total 50 UCS, 50 BTS, and in industrial standard, total 30 punch penetration test and 20 CAI test were conducted to establish database that were used for investigating relations between rock properties and normal cutter force. As a result of research, it is concluded that the normal force is related to some rock properties including UCS, BTS, PI, and CAI. Finally, in order to estimate the normal cutter force, an empirical equation was developed as a function of some engineering properties of rock with correlation coefficient of 0.95.
|Original language||Multiple languages|
|Title of host publication||VIII. Regional Rock Mechanics Symposium, Istanbul Technical University,|
|Editors||M. Vardar et al|
|Place of Publication||Istanbul|
|Number of pages||8|
|Publication status||Published - 2006|