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Results of linear cutter experiments with disk cutters
Actual crater depth versus predicted crater depth from equation
2 other sections not shown
0.15 CRATER DEPTH 16 NORMAL FORCE 45 ENERGY based on equation Bonnet granite Observed boring rate Bureau Calculated data based cutter load cutterhead torque cutting edge data Calculated data DlSK energy and rock equation 15 equation 20 equation was developed error of estimate FORCE ON D1SK function of crater function of normal granite Observed data hard rocks increase input energy laboratory Lac du Bonnet linear cutter medium rocks multiple correlation multiple correlation coefficient normal cutter force normal cutting force Observed data Calculated optimum cutter spacing percent physical properties predicted crater volume predicted crater width prediction equation ratio of specific regression analysis rock compressive strength rock properties shear modulus Shore hardness Shore scleroscope hardness single crater width soft and medium soft rock specific energy standard error tangential cutter force tangential force tunnel boring machines unit length versus predicted crater volume of rock volume per unit