... Efficiency of a tunnel boring machine (TBM) depends on its cutting performance, and instances of breakdowns reduce the machine availability while escalating the time and cost associated with the project. Cutting performance is governed by the replacement cycle of cutter-picks, since they endure...

... machines are commonly used for surface drilling, tunnel excavation, and underground mining. Drill-bit buttons need to be designed to increase the rock drilling efficiency. The optimal button arrangement of a drill bit and its operating condition were proposed to improve the drilling efficiency. A new...

... simulations, the characteristic slip-weakening distance, d c , is one of the most important input parameters. This study proposes a methodology to constrain d c of a large-scale fault in an underground mine, based on seismic efficiency η defined by ER (seismically radiated energy) / ΔW (potential energy...

... for the of the M-HT fracture, a method. Ac rton (Barto sting fractur o the equati tate. Howev ul measurem nd dips are s of the Ma ped, and the ults query. A cs of , (c) St ace of the com ty and effici ornet et al. ated in Fig 997), the m is about 15% cipal stresses also applied stress meas pre-existing gical...