中文摘要：

本文分析了高频纵向超声导波在埋置于水泥中的螺纹钢锚杆中的传播特性，提出了有效计算直径的概念，指出在频散曲线计算中，对于螺纹钢锚杆应按照有效计算直径进行计算。并且在实验室及现场检测中验证了这一观点，为螺纹钢锚杆导波检测的工程应用打下一定基础，可供类似工程借鉴。

英文摘要：

The propagation characteristics of high frequency longitudinal ultrasonic guided waves of bolt with thread which is embedded in grout are studied in the paper. The available computing diameter is introduced in the computing about the disperse curves of bolt with thread. The results of laboratry and field inspection indicate that the disperse curves of bolt with thread should adopt the available computing diameter, which lay the foundation for the inspection of bolt with thread using ultrasonic guided waves.