Falling or sliding of loose blocks is one of the most common failure modes in a rock tunnel. For tunnels in hard and jointed rock, fibre-reinforced shotcrete (sprayed concrete) in combination with rock bolts is one of the most commonly used supports to prevent such failures. The structural behaviour, and especially the failure, of this type of rock support, is complex and involves several failure mechanisms; such as cracking of the shotcrete and interface failure along the shotcrete-rock, bolt-grout and rock-grout interface. Therefore, rock supports are normally designed using analytical solutions based on the independent failure modes. However, these failure modes are derived based on experimental testing and the assumption that no interaction between the failure modes occur. This assumption has not been verified. Therefore, this paper presents a numerical model capable of simulating the failure of a bolt-anchored and fibre-reinforced shotcrete lining. The model includes bond failure between shotcrete and rock, cracking of the shotcrete and pull-out failure of rock bolts. The structural behaviour for each failure mode and the complete structure have been verified against experiments from the literature. This shows that the model is capable of simulating the different phases of failure, and show good agreement with results from full-scale experimental tests from the literature. Furthermore, results from the numerical simulation confirms that the design of the shotcrete lining can be based on individual failure mechanisms. Moreover, it was shown that a design based on the residual strength of the fibre-reinforced shotcrete is conservative compared to a design based on the bond strength.

松动块体的掉落或滑动是岩石隧道中最常见的破坏模式之一。对于硬岩石和节理岩石中的隧道，纤维增强的喷射混凝土（喷浆混凝土）与锚杆的结合是防止此类破坏的最常用的支架之一。这种岩石支架的结构行为，尤其是破坏，是复杂的，并涉及多种破坏机制。例如喷射混凝土的开裂和沿喷射混凝土，螺栓灌浆和岩石灌浆界面的界面破坏。因此，通常采用基于独立破坏模式的分析解决方案来设计岩石支架。但是，这些故障模式是根据实验测试和故障模式之间不发生交互作用的假设得出的。该假设尚未得到验证。因此，本文提出了一种能够模拟锚固和纤维增强喷射混凝土衬砌破坏的数值模型。该模型包括喷射混凝土与岩石之间的粘结破坏，喷射混凝土的开裂和岩栓的拔出破坏。已针对文献中的实验验证了每种失效模式的结构行为和完整结构。这表明该模型能够模拟故障的不同阶段，并且与文献中的全面实验测试的结果显示出很好的一致性。此外，数值模拟的结果证实喷射混凝土衬砌的设计可以基于单独的破坏机制。此外，