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MEASUREMENT OF SOIL ACOUSTIC PROPERTIES BASED ON TECHNIQUE OF GUIDED
WAVES
WU Bin MENG Tao HE Cunfu
IAO Jingpin
(College of Mechanical Engineering and Applied Electronic Technology, Beijing University of
Technology, Beijing 100022
)
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Abstract: 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 buried
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.
Key words: Soil Acoustic properties
Ultrasonic guided waves
CLC No: TB551
国家自然科学基金(10272007, 10372009)和北京市教委
(KM200310005012)资助项目. Received 20050920, received in revised form 20060606
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