玻璃钢锚杆扭转性能及锚固参数研究

发布时间：2018-11-06 17:27

【摘要】：本文玻璃钢锚杆扭转性能及锚固参数研究为课题,以理论分析为主,研究玻璃钢锚杆的抗扭破坏规律及锚杆在弹性围岩体锚固长度的探究与分析,并对其进行现场试验的验证和数值模拟的分析验证,取得以下研究结论:1、在玻璃钢锚杆在玻璃钢锚杆在煤岩巷道的支护中,发现其抗扭性能相比与传统螺纹钢锚杆较差,当施加扭矩过大使其锚固性能失效,因此需要研究玻璃钢锚杆的破坏规律,基于玻璃钢锚杆理想化看作圆杆的状态下的假说,在建立玻璃钢锚杆的抗扭转力学模型的基础上,分析锚杆的抗扭力矩M与玻璃钢锚杆由于扭转而产生变形单位轴线长度的相对扭转角θ的关系及变化趋势,在经过对锚杆扭转破坏的研究中发现,在给玻璃钢锚杆施加扭矩为0-45N·m,玻璃钢锚杆扭转力矩M与单位轴线长度的相对扭转角0的关系式θ = 2M/(πGr4)。2、根据锚杆的受力特征,首先,建立了围岩—锚杆的力学模型,根据模型各种位移的分布,分析各种位移的之间的关系,从而得出支护前后的位移解析式。然后,对锚杆支护前后的各种能量关系进行分析,利用能量守恒原理,围岩在没有支护前所释放总能量,等于围岩在锚杆支护后各种能量的总量。最终,确定了锚杆锚固长度理论公式,分析研究了极限锚固长度的影响因素与规律。由于玻璃钢锚杆相比于传统的螺纹钢锚杆具有许多优点:质量轻、容易切割、不产生火花、成本低等,但是玻璃钢锚杆在实际应用中常发生锚固失效现象,研究锚杆锚固失效的原因和提高锚杆锚固能力是当前现场生产实践中需要迫切解决的重要课题。
[Abstract]:In this paper, the torsional properties and anchoring parameters of FRP anchor are studied. The torsional failure law of FRP anchor and the length of anchoring in elastic surrounding rock are studied based on theoretical analysis. The conclusions are as follows: 1. In the support of coal and rock roadway, it is found that the torsional resistance of FRP bolt is worse than that of traditional steel bolt. The failure rule of FRP anchor rod should be studied when the applied torque is too large. Based on the hypothesis that the FRP bolt is idealized as a circular rod, the torsional mechanical model of FRP bolt is established. The relationship between the torsional moment M of anchor rod and the relative torsional angle 胃 of the length of deformation unit axis caused by torsion of FRP anchor rod is analyzed, and the change trend is also analyzed. Through the research on the torsional failure of anchor rod, it is found that, The relationship between torsional moment M and relative torsion angle 0 of unit axis length is 胃 = 2M/ (蟺 Gr4). 2. According to the mechanical characteristics of the anchor, the relationship between torsional moment M and relative torsion angle 0 of unit axis length is obtained. 2. According to the mechanical characteristics of the anchor rod, the relationship between the torsion moment M and the relative torsion angle of unit axis length is obtained. The mechanical model of surrounding rock and bolt is established. According to the distribution of displacement in the model, the relationship between displacement is analyzed, and the analytical formula of displacement before and after supporting is obtained. Based on the principle of energy conservation, the total energy released by surrounding rock before and after bolting is equal to the total energy of surrounding rock after bolting. Finally, the theoretical formula of anchoring length is determined, and the influencing factors and rules of ultimate anchoring length are analyzed and studied. The FRP bolt has many advantages compared with the traditional rebar anchor, such as light weight, easy cutting, no sparking, low cost, etc. However, the Anchorage failure often occurs in the practical application of FRP anchor. It is an urgent task to study the reasons of bolt Anchorage failure and to improve the Anchorage ability of Anchorage rod in the field production practice.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD353.6

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