Dominant rock properties affecting the performance of conical picks and the comparison of some experimental and theoretical results


Bilgin N., DEMIRCIN M., Copur H. , BALCI C. , TUNCDEMIR H. , AKCIN N.

INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES, cilt.43, ss.139-156, 2006 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 43 Konu: 1
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1016/j.ijrmms.2005.04.009
  • Dergi Adı: INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
  • Sayfa Sayıları: ss.139-156

Özet

Conical picks are the essential cutting tools used especially on roadheaders, continuous miners and shearers and their cutting performance affects directly the efficiency and the cost of rock/mineral excavation. In this study, in order to better understand the effects of dominant rock properties on cutter performance, 22 different rock specimens having compressive strength values varying from 10 to 170 MPa are first subjected to a wide range of mechanical tests. Then, laboratory full-scale linear cutting tests with different depth of cut and cutter spacing values are realized on large blocks of rock specimens using one type of conical pick. Specific energy, cutting and normal force values for relieved and unrelieved cutting modes are recorded using a triaxial force dynamometer with capacity of 50 tonnes and a data acquisition system. Cutter force and specific energy values are correlated with rock properties and theoretical force and specific energy values obtained from widely used theoretical approaches.