新型多臂凿岩台车钻头破岩机理仿真研究

发布时间：2018-10-20 10:02

【摘要】：凿岩台车作为隧道钻爆法施工的主导设备,在隧道施工中的作用越来越重要,特别是在复杂的地质条件下,凿岩台车的钻孔效率、成孔质量直接决定隧道施工的质量和工程进度。随着岩石硬度与钻进深度的不断增加,凿岩台车钻眼机具选配以及冲击凿岩时的凿岩参数匹配是影响钻进效率的关键因素,而凿岩参数的匹配与钻头破岩机理有着很密切的联系,因此,对于凿岩台车钻头破岩机理的研究具有重要的理论意义和工程实用价值。本文首先简要介绍了凿岩台车的结构原理,详细阐述了其核心机构液压凿岩机的基本结构与工作原理,在此基础上,对凿岩台车钻头破岩过程中的核心机构液压凿岩机的主要性能参数、测试方法以及性能参数的选择进行了重点分析,并且分析了凿岩台车施工钻孔质量的控制及要求;然后,根据岩石的物理力学特性,结合凿岩台车钻眼机具的结构特点,分析了凿岩台车钻眼钻进过程以及钻进过程中所遇到的问题;最后,本文利用波动力学理论,对钻头破岩过程中的动力学进行了分析,综合岩石连续损伤本构模型建立了钻头单次冲击破碎岩石的有限元模型,运用ANSYS有限元软件中的LY-DYNA模块进行了动力学仿真分析,通过仿真结果分析,了解了钻头破碎岩石的整个详细过程,得到了钻头破碎岩石过程中的钻头钻进速度、深度与凿岩反力的时程曲线,同时还针对不同性能凿岩参数对钻头破岩参数的影响进行了仿真分析,讨论了不同性能凿岩参数对于钻头破碎岩石的影响,得到了在不同性能凿岩参数匹配作用下岩石的破碎机理。本文针对凿岩台车钻头破岩机理的研究为今后实际工程应用中凿岩台车凿岩钻进机具的合理选择与参数匹配提供了理论指导,同时也为凿岩台车的设计与改进提供了一定的参考依据。
[Abstract]:As the leading equipment of tunnel drilling and blasting construction, drilling bench is playing a more and more important role in tunnel construction, especially in the complex geological conditions, the drilling efficiency of drilling abutment is more and more important. The quality of the hole directly determines the quality of the tunnel construction and the progress of the project. With the increasing of rock hardness and drilling depth, the selection of drilling tools and the matching of drilling parameters during impact drilling are the key factors affecting drilling efficiency. However, the matching of drilling parameters is closely related to the rock breaking mechanism of drill bit, so it is of great theoretical significance and practical value to study the rock breaking mechanism of drilling rig bit. In this paper, the structure principle of rock drilling platform is introduced briefly, and the basic structure and working principle of its core mechanism hydraulic rock drill are described in detail. The main performance parameters, test methods and selection of performance parameters of hydraulic rock drill, which is the core mechanism in the process of rock drill bit breaking, are analyzed emphatically, and the quality control and requirements of drilling hole in the construction of rock drilling platform are analyzed. According to the physical and mechanical characteristics of rock, combined with the structural characteristics of drilling rig, the drilling process of drilling rig and the problems encountered during drilling are analyzed. Finally, the theory of wave mechanics is used in this paper. The dynamics of rock breakage is analyzed. The finite element model of rock broken by single impact is established by synthesizing the constitutive model of rock continuous damage, and the dynamic simulation is carried out by using LY-DYNA module in ANSYS finite element software. Through the analysis of simulation results, the whole detailed process of rock breakage is understood, and the time history curves of bit drilling speed, depth and drilling reaction force are obtained. At the same time, the influence of different drilling parameters on the rock breaking parameters of bit is simulated and analyzed, and the influence of different drilling parameters on the broken rock of bit is discussed. The mechanism of rock fragmentation under the matching of drilling parameters with different performance is obtained. In this paper, the research on the rock breaking mechanism of drill bit of drilling rig provides theoretical guidance for the reasonable selection and parameter matching of drilling tools and parameters in practical engineering application in the future. At the same time, it also provides a certain reference for the design and improvement of rock drill.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.3

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