.... The results are thrust- penetration curves (Figure 2) showing that up to a certain penetration rate only crushing occurs ( subcritical penetration ). From there the desired rock fragmentation process called chipping takes place (Frenzel et al., 2012). These two different fragmentation processes can...

... is a microcosm of the in-situ geology that makes up the surface mine in which the rotary blasthole drill is deployed. The performance metrics that are influenced by the in-situ geology are penetration rate (distance drilled per unit time), rotary torque and to a lesser extent rotary speed and vibration...

... along the TBM drive and neglect the uncertainties in parameters that occur. And so to improve the predictive capability of these models and to incorporate the above uncertainties, the penetration rate is modeled as a stochastic variable depending on the geotechnical and TBM parameters, its statistical...

... pit iron ore mine and assay results from more widely spaced exploration drill holes. The drill monitoring data are represented by a parameter we call the Adjusted Penetration Rate (APR) and we observe a strong correlation between APR and iron grade from the assays. Fusion allows a more detailed...

... excavatability drilling performance plinninger rock property penetration rate hardness consumption destruction work thuro drillability rock type tunnel tool wear foliation Drilling 1227 Thuro, K., Plinninger, R.J., Hard rock tunnel boring, cutting, drilling and blasting: rock parameters...

... as reported previously are as follows.(Equation in full paper) where p is the cutting depth and σ c is the rock strength. reservoir geomechanics particular reference diameter penetration rate cutter head Nishimatsu TBM specification tunnel diameter Reservoir Characterization cutter...

... Stiffness Index Alteration Parameter Upstream Oil & Gas drilling parameter recorder drilling operation rock-mass classification Quality classification percussion wave drilling bit penetration rate limestone Engineering recording drilling parameter limestone quality torque cavity thrust...

... structural geology cutter hard rock tunnel penetration rate Upstream Oil & Gas performance prediction laboratory Norwegian Institute Engineering prediction construction engineering Performance Estimation Reservoir Characterization miniature drill test drillability testing...

... cutter investigation borer strength Reservoir Characterization site investigation TBM penetration rate characteristic rock class Upstream Oil & Gas diameter double shield tbm excavation tunnel rock mass lithotype utilisation factor granite thrust Tunnelling by doubleshield TBM...

... for the connection of another segment piece. After a complete ring of segments has been jacked up, the chute and conveyer are reconnected and a new boring cycle commences. Upstream Oil & Gas shield type blind raise boring machine penetration rate blind raise boring machine cutter head modification...

... des bohrers und die Laenge der bohrerkante (-klinge) basiert ist. INTRODUCTION This report describes a method to estimate penetration rate in percussive drilling based on a simple laboratory test carried out on small rock samples. - The test is a reduced scale reproduction of the actual percussive...

... relationships between drilling variables. drilling operation information discontinuity penetration rate drill string borehole 3 laboratory torque fissure Upstream Oil & Gas borehole tsoutrelis packer Directional Drilling strength site investigation diamond drilling drilling variable...

... resultats sont compares à ceux chronometres. II en ressort que les taux de penetration peuvent être predits dans une certaine mesure par seulement quatre des cinq methodes etudiees. SUMMARY: The applicability of five methods of predicting penetration rates of full face boring machines to geological...

... SUMMARY: The main elements in an empirical model for predictions of net penetration rate and cutter costs for tunnel boring with disc cutters are presented. Systematic cost calculations based on this model allow comparisons between tunnel boring and conventional tunnelling...

... to estimate the penetration rate, respectively the economic range of TBM utilization. The test methods are briefly described and discussed, and test results are given. RESUME: On à tente, sur la base de quelques essais simples de mecanique des roches, de developper un système de pronostic d'utilisation...