Fully encapsulated rock bolts are widely used in keeping the stability of underground openings and slopes. However, bonding failure at the bolt/grout (B/G) interface still occurs. Thus, a theoretical solution was proposed to investigate the rock bolting performance. The coupling and decoupling behaviour of the B/G interface is simulated with a bonding-slipping formula. The feasibility of this bonding-slipping formula was confirmed with physical experiments on rock bolts. Then, the rock bolt loading procedures were analysed. The advantage of this theoretical model is that all input parameters can be directly acquired from the experimental pullout scenario. Three physical pullout experiments, including laboratory and field tests, were used to validate this theoretical modelling. After validation, the deduced theoretical model can calculate the rock bolting performance. Then, this model was adopted to perform the parameter analysis. The results reveal that the loading phases of the B/G interface are independent of the encapsulated length. With the increasing encapsulated length, the B/G interface encounters the elastic, elastic-debonding and debonding phases in order. Moreover, with the increasing grouting material modulus, the rock bolt shows more brittle performance.

全密封锚杆广泛用于保持地下洞口和边坡的稳定性。然而，螺栓/灌浆（B/G）界面处的粘合失败仍然发生。因此，提出了一种理论解决方案来研究岩石锚固性能。B/G 界面的耦合和解耦行为使用键滑公式进行模拟。岩栓物理实验证实了这种粘结滑移公式的可行性。然后，分析了锚杆加载过程。这种理论模型的优点是所有输入参数都可以直接从实验拔出场景中获取。三个物理拔出实验，包括实验室和现场测试，被用来验证这个理论模型。验证后，推导出的理论模型可以计算锚杆性能。然后，采用该模型进行参数分析。结果表明，B/G 界面的加载阶段与封装长度无关。随着封装长度的增加，B/G 界面依次遇到弹性、弹性脱粘和脱粘相。此外，随着灌浆材料模量的增加，锚杆表现出更脆的性能。