To investigate the process of the rock fragmentation process concerning anisotropy, insitu drilling tests were performed with a percussive rock drill commonly used in conventional tunnelling. Subsequently fracture patterns were analyzed underneath the drilling bit. Based on the gained results the drilling and cutting processes were simulated with the numerical code PFC 2D (Particle Flow Code 2D), which contains a discontinuum mechanical approach. For the indentation in different “virtual” rock types different shapes of rock cutting tools including button bits, disc cutters and roadheader picks were created. The aim of the thesis was to examine the fracture pattern in correlation with the simulated foliation and to investigate the influence of tool shape and design on the fracture propagation.
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To investigate the process of the rock fragmentation process concerning anisotropy, insitu drilling tests were performed with a percussive rock drill commonly used in conventional tunnelling. Subsequently fracture patterns were analyzed underneath the drilling bit. Based on the gained results the drilling and cutting processes were simulated with the numerical code PFC 2D (Particle Flow Code 2D), which contains a discontinuum mechanical approach. For the indentation in different “virtual” rock t...
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