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锚杆、锚索的锚固树脂易受岩层断裂引起的冲击载荷影响,研究锚固树脂的动力学特性对提高锚杆、锚索的抗冲击性能具有重要的指导意义。为进行分离式霍普金森压杆实验,首先采用弹性波检测仪测定了分离式霍普金森压杆装置的入射杆(透射杆)、锚固树脂的波速;然后理论分析了锚固树脂在入射杆、透射杆的夹持下的波动特征,得到了基于入射杆、透射杆动态信号的锚固树脂两端动态应力计算式,最后利用分离式霍普金森压杆装置进行了不同长度的锚固树脂试样的动力加载实验。结果表明:长度大于100 mm的锚固树脂具有波动衰减特性、应力不均匀性和破坏模式长度效应;试样长度越长,侧向自由面的反射越强,在有轴向压力情况下的压曲、拉断效应越明显,且其受损破坏强度越低。
The anchoring resin of anchors and anchors is easily affected by the impact load caused by fracture of rock strata. Studying the dynamic characteristics of anchoring resin has important guiding significance for improving the impact resistance of anchors and anchors. In order to carry out the split Hopkinson pressure bar test, firstly, the wave velocity of the incident rod (transmission rod) and the anchoring resin of the split Hopkinson pressure bar device was measured by using the elastic wave detector; then the effect of the anchoring resin on the incident rod, The dynamic characteristics of the anchoring resin based on the dynamic signals of the incident rod and the transmission rod are obtained. The dynamic stress of the anchoring resin is obtained by the split Hopkinson pressure bar device. Power loading experiment. The results show that the anchoring resin with the length greater than 100 mm has the characteristics of wave attenuation, stress nonuniformity and failure mode length. The longer the sample length, the stronger the reflection of the lateral free surface, the buckling under the axial pressure , Pull off the effect of the more obvious, and the lower the damage damage intensity.