Rock quality is a critical design parameter of rock bolts. However, rock weathering deteriorates rock quality and adversely affects the performance of rock bolts. The objective of this study was to investigate variations in the velocity and predominant frequency of guided waves in rock bolts subjected to rock weathering. In experiments, chemical and mechanical weathering on 10 rock specimens was achieved with salty water and a slake durability test, respectively. The measured properties of weathered rock specimens were used in a numerical simulation model. Numerical studies on rock bolt surrounded by weathered rock mass were performed to simulate guided waves in the rock bolt. The results show that the group velocity and predominant frequency of the rock bolt decreased the weathering progressed. The grey relational grade value and importance score based on the random forest algorithm indicate that the group velocity and predominant frequency are significant factors sensitive to rock weathering. This study demonstrates that the group velocity and predominant frequency of guided waves can be useful tools for predicting rock weathering surrounding rock bolts.

岩石质量是岩石锚杆的关键设计参数。然而，岩石风化会降低岩石质量并对岩石锚杆的性能产生不利影响。本研究的目的是调查岩石风化作用下锚杆中导波的速度和主频率的变化。在实验中，10 个岩石标本的化学和机械风化分别通过咸水和熟化耐久性试验实现。风化岩石试样的测量特性用于数值模拟模型。对被风化岩体包围的锚杆进行了数值研究，以模拟锚杆中的导波。结果表明，随着风化的进行，锚杆的群速度和主频降低。基于随机森林算法的灰色关联等级值和重要性得分表明群速度和优势频率是岩石风化敏感的重要因素。这项研究表明，导波的群速度和主导频率可以成为预测岩石风化围岩锚杆的有用工具。