| Jumbo as tunnel drilling and blasting construction method of main equipment, becomes more and more important in the tunnel construction, especially under complex geological conditions, drilling rig drilling efficiency, drilling quality directly determines the quality and progress of the tunnel construction. With the increase of rock hardness and drilling depth, drilling parameters of drilling jumbo eye equipment selection and matching of impact drilling is a key factor affecting the drilling efficiency, drilling parameters and matching with the rock breaking mechanism has a very close relationship. Therefore, has important theoretical significance and practical value for the study of rock breaking mechanism of drilling bit.This paper briefly introduces the structure principle of drilling rig, expounds the basic structure and working principle of the core mechanism of hydraulic rock drill, on this basis, the main performance parameters, test method of drilling jumbo drill core breaking mechanism of the hydraulic rock drill rock in the process of the performance and parameter selection are analyzed, analysis and control of and requirements for the construction quality of drilling rig drilling; Then, according to the physical and mechanical characteristics of rock structure, combined with the characteristics of drilling rig drilling equipment, analysis of the drilling rig drilling process and study the problems encountered in the drilling process; Finally, by using the theory of wave mechanics, dynamics of rock breaking process are analyzed, the damage constitutive model is established for single impact drill finite element of broken rock model with continuous rock damage, Using LY-DYNA module of ANSYS finite element software for dynamic simulation analysis, through the analysis of simulation results, to understand the whole process of rock failure in detail, the process of rock failure in drilling speed, drilling depth and force time curve, and also for different drilling parameters on rock breaking performance the parameters are simulated and analyzed, different performance parameters for rock drilling is discussed, by matching rock fragmentation mechanism under the action of various performance parameters of rock.This paper for jumbo bit breaking rock mechanism of the research for the future practical engineering application in drilling rig drilling equipment selection and parameter matching provides a theoretical guidance, and drill rig design and improvement to provide some reference for. |
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