玻璃钢锚杆在煤岩体支护中的扭转破坏
Torsion Failure of Glass Fiber Reinforced Plastic Bolt in Coal Rock Mass
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摘要: 玻璃钢锚杆在煤岩巷道的支护中，其抗扭性能相比传统螺纹钢锚杆较差，当施加扭矩过大使其锚固性能失效，从而需要用预紧力表达玻璃钢锚杆变形所产生的单位轴线长度的相对扭角θ；基于玻璃钢锚杆理想化看做圆杆状态下的假说，建立了力学模型，分析了扭转力矩M与玻璃钢锚杆变形产生单位轴线长度的相对扭角θ的关系及变化趋势，同时采用FLAC3D模拟了玻璃钢锚杆在施加预紧力的过程中是慢慢屈服到突然整体失稳过程，与现场实验结果基本一致。结果表明：玻璃钢锚杆在施加力矩0～45 N·m时，M与θ可以建立较为简单的数学表达式，在一定的范围内，采用扭转力矩预测和量化了锚杆扭转变形量可以作为一种较准确且易行的施工判断方式。Abstract: In the coal mass support with glass fiber reinforced plastic bolt, its anti-torsion performance compared with the traditional screw steel bolt is poor; oversize torque causes the failure of anchorage performance, so the relative torsional angle θ of unit axis length generated by FRP bolt deformation needs to be expressed by pre-tightening force. Based on the assumption that the glass fiber reinforced plastic anchor rod is considered as the state of the round rod, and the relationship and the variation trend of the torsional moment M and the axial length of glass fiber reinforced plastic anchor rod deformation are established. Results show that when FRP bolt applied torque 0 N·m to 45 N·m, M and θ can establish a relatively simple mathematical expressions; within a certain range, using torsional moment to predict and quantify the bolt torsion deformation can be used as a more accurate and easy construction judgment way.
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