挤压—摩擦式吸能锚杆研究

发布时间：2018-03-10 16:22

本文选题：冲击地压　切入点：吸能　出处：《辽宁工程技术大学》2015年硕士论文　论文类型：学位论文

【摘要】：锚杆支护是一种“主动”支护,是世界各国矿井中主要的支护形式。本文针对传统煤矿支护锚杆不具备吸能让位功能,利用数值模拟与试验研究交替结合的方法,研究挤压-摩擦式吸能锚杆(EEA)的力学性能。针对挤压-摩擦式吸能锚杆的结构形式：包括套筒、碟形锚杆托盘、六角衬里管及无纵肋螺纹钢树脂锚杆等构件在内的机械装置,研究了结构方案的可行性。利用数值模拟软件ANSYS/LS-DYNA建立了挤压-摩擦式吸能锚杆吸能构件的有限元模型,采用控制变量法,分别研究了各个构件不同尺寸对吸能效果的影响。研究发现六角衬里管壁厚、端头直径、摩擦柱台高度、挤压圆台高度均与呈正相关关系。基于数值模拟软件ANSYS/LS-DYNA研究了动载荷作用下配套使用的碟形托盘的力学特性,发现采用45#钢的碟形锚杆托盘对抗冲击荷载有一定优势,可作为挤压-摩擦式吸能锚杆配套使用的托盘；建立了挤压-摩擦式吸能锚杆的整体有限元模型,研究了它在质量块以一定速度撞击时的力学性能,结果表明,挤压-摩擦式吸能锚杆对抗冲击荷载有明显效果,并具有承受多次冲击的能力。加工了挤压-摩擦式吸能锚杆实验室拉伸试验模型,利用WAW-600C微机控制电液压伺服万能试验机研究了挤压-摩擦式吸能锚杆中锚杆杆体端头直径对吸能效果的影响。结果发现在28mm-29mm的范围时,端头直径对阻力值影响效果明显,试验结果与数值模拟的结果保持一致。因此,为保持较为平稳的阻力曲线,应选取强度较高的端头材料。挤压-摩擦式吸能锚杆的研制,通过传统锚杆与机械吸能装置的配合,克服了传统螺纹钢锚杆的延展性完全依赖于材料塑性变形的不足,实现了锚杆的高强度、可延伸的性能。
[Abstract]:Bolt support is a kind of "active" support, which is the main support form in mines all over the world. Aiming at the fact that the traditional coal mine bolting bolt does not have the function of energy absorption and displacement, the method of alternating combination of numerical simulation and experimental research is used in this paper. The mechanical properties of Extrusion-friction Energy absorbing Anchorage (EEAA) are studied. The structural forms of Extrusion-friction Energy Absorber Anchorage (EEAA) are studied. The mechanical devices include sleeve, disc bolt tray, hexagonal lining tube and non-longitudinal ribbed steel resin anchor, etc. The feasibility of the structural scheme is studied. The finite element model of the energy-absorbing member of the extrusion-friction type energy absorption bolt is established by using the numerical simulation software ANSYS/LS-DYNA, and the control variable method is adopted. The effects of different dimensions of each member on the energy absorption efficiency are studied respectively. It is found that the wall thickness of the hexagonal liner, the diameter of the end head, the height of the friction column, Based on the numerical simulation software ANSYS/LS-DYNA, the mechanical properties of the disc tray used under dynamic load are studied, and it is found that the disc anchor tray with 4steel has some advantages in resisting impact load. The whole finite element model of the extrusion-friction energy absorption anchor is established, and its mechanical properties under the impact of the mass block at a certain speed are studied. Extrusion-friction energy absorption anchor has obvious effect on resisting impact load and has the ability to withstand multiple shocks. The laboratory tensile test model of extrusion-friction energy absorption anchor is processed. The influence of the end diameter of the bolt body on the energy absorption effect is studied by WAW-600C microcomputer controlled electro-hydraulic servo universal testing machine. The results show that the effect of the end diameter on the resistance value is obvious in the range of 28mm-29mm. The experimental results are consistent with the results of numerical simulation. Therefore, in order to maintain a more stable resistance curve, a high strength end material should be selected. The development of extrusion-friction energy absorbing anchor rod is carried out through the cooperation of traditional anchor rod and mechanical energy absorption device. The ductility of the traditional rebar anchor is completely dependent on the plastic deformation of the material, and the high strength and extensible properties of the bolt are realized.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353

【参考文献】