Evaluation Of Cutter-head Performance Based On Cutter-head Load Model

Full face rock tunnel boring machine(TBM) has been widely used in hard rock tunnels, railways, mining and other projects. With China's large-scale infrastructure construction, TBM localization process faster and faster, however, there are few published papers in literatures for various reasons and the design criteria of a TBM under complex geological environment is not clear yet, therefore, to establish independent TBM related theoretical system design is becoming increasingly important. In this paper, a few research works about how to design a high efficient cutter-head and some criteria about cutter-head has been implemented in this paper based on the study at home and abroad.To deal with the complex relationship among geological parameters, cutter parameters, and operating parameters during tunneling processes, a cutter load model was established by using CSM(Colorado School of Mines) prediction model in this paper. And through this model to analyze the cutter size parameters, geological parameters, driving parameters affect the force of the cutters. The force on cutter increases with increasing UCS(uniaxial compressive strength) value.Established the cutter-head load model. The force distribution on the cutter-head was studied based on the cutter-head load model. FPI(field penetration index) and SE(special energy)is used to determine the effect of tunneling parameters on driving efficiency, that is, under the rated power allowed, large penetration of the excavation will help improve the efficiency of broken rock.Established the formula for cutter-head thrust and torque in different geological conditions. Cutter-head thrust and torque, to evaluate driving efficiency. Established the formula for calculating the cutter eccentricity, to evaluate load balanced of cutter-head. Established the formula for calculating thrust torque ripple under stratified geological conditions, to evaluate dynamic stability, based on the model, thrust fluctuations are calculates for spiral-shaped cutter-head and mi-shaped cutter-head.A fitting mathematical model of ZT(ratio of cutter-head torque and thrust) and penetration was established, and verified by TB880 E, the results of simulation and recorded data are similar, which shows that the method of simulation is feasible. A prediction model relationship hob driving torque and thrust ratio and the degree of penetration, to provide an effective reference tunneling construction parameters for the cutter. A new principle considering force distribution and cutter abrasion is used to solve the disc cutters' arrangement on cutter-head. When putting cutters at central, it is considered the limiting of the load and the largest rock breaking spacing, when arranging in the outer ring cutters abrasion is the main consideration, outer circle cutters spacing are smaller or arranged several cutters on one trace.