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中文摘要：
土壤的声学特性对地埋管道中超声导波传播有重要的影响.在空气和地埋情况下,通过典型波导（细钢杆）的超声导波检测试验的方法来测量土壤声学特性.基于超声波的衰减特性,通过将试验获得的杆中L（0,1）模态导波的衰减曲线,与理论衰减曲线进行比对的方法,得到土壤的声学特性参数-纵波和横波波速.在该土壤声学特性条件下,研究土壤对管道中超声导波传播影响.研究发现,此种土壤介质对管道中超声导波传播有很大影响,在低频处产生了新的轴对称模态：α1和α2.
英文摘要：
The acoustic properties of soil greatly affect the propagation of guided waves in buried pipelines. In order to ascertain the acoustic properties of soil, guided are detection experiments using a typical wave guide （a steel rod） are conducted in air and in soil. Based on the established attenuation characteristics of elastic waves, the attenuation curve for the L （0,1） mode is obtained. By comparing the experimental attenuation curve with theoretical curves, the acoustic properties of soil （velocities of longitude waves and transverse waves） are determined. The results are used to analyze guided waves propagating in a buffed pipeline. The soil has a great influence on the propagation of guided waves, and two new axisymmetric modes —— a1 and a1 occur at low frequencies.
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