In real engineering, with the gradual deterioration of mining geological conditions, the improvement of the bearing performance of fully grouted bolts is beneficial to better control of the roadway surrounding rock. For this purpose, based on the idea of steel fiber reinforced concrete, a systematic laboratory study was conducted to investigate the effect of steel fiber grout on the bearing performance of anchored specimens. Three steel fibers with different diameters (0.5, 1.0 and 1.5 mm) were selected. Fiber specimens and fiber-free specimens were prepared and a series of pull-out tests were conducted. The experimental results show that the steel fiber grout can effectively improve the bearing performance of the anchored specimens and enhance the anti-destructive ability of the anchored specimens. The steel fibers in the grout can enhance the mechanical interlocking effect, the dilatancy effect and the friction effect of the anchoring interface, thereby improving the ability of the anchored specimen to withstand additional loads. The reinforcement effect of steel fiber on the bearing performance of the anchored specimens presents an obvious diameter dependence. With the increase of the steel fiber diameter, the bearing properties of the anchored specimens tend to increase and the cumulative AE counts, cumulative AE hits, cumulative AE energy and AE events also increase. Moreover, the steel fiber grout can more fully mobilize the bearing performance of the anchoring interface, and the number of microcracks in the fiber specimens increases during the bearing process. This research results may provide a useful reference for the support design of fully grouted bolts.

在实际工程中，随着采矿地质条件的逐步恶化，全注浆锚杆承载性能的提高有利于更好地控制巷道围岩。为此，基于钢纤维增强混凝土的思想，进行了系统的实验室研究，以研究钢纤维灌浆对锚固试样的承载性能的影响。选择了三种直径（0.5、1.0和1.5 mm）不同的钢纤维。准备了纤维样品和无纤维样品，并进行了一系列的拉拔测试。实验结果表明，钢纤维灌浆可以有效提高锚固试样的承载性能，增强锚固试样的抗破坏能力。灌浆中的钢纤维可以增强机械互锁效果，膨胀效果和锚固界面的摩擦效果，从而提高锚固样品承受额外载荷的能力。钢纤维对锚固试样承载性能的增强作用具有明显的直径依赖性。随着钢纤维直径的增加，锚固样品的承载特性趋于增加，并且累积的AE数量，累积的AE碰撞，累积的AE能量和AE事件也增加。此外，钢纤维灌浆可以更充分地发挥锚固界面的承载性能，并且在承载过程中，纤维样本中的微裂纹数量会增加。