Investigation of the waveguide properties of a borehole and their use for acoustic measurements in situ
A method of measurement of the velocity of a shear wave travelling in the vicinity of a borehole, using its waveguide properties, is both analyzed and verified. In particular, by this method, the shear wave velocity is determined from the velocity of the so-called tube wave which corresponds to the...
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| Format: | Article |
| Language: | English |
| Published: |
Institute of Fundamental Technological Research Polish Academy of Sciences
2016-03-01
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| Series: | Archives of Acoustics |
| Online Access: | https://acoustics.ippt.pan.pl/index.php/aa/article/view/3275 |
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| Summary: | A method of measurement of the velocity of a shear wave travelling in the vicinity of a borehole, using its waveguide properties, is both analyzed and verified. In particular, by this method, the shear wave velocity is determined from the velocity of the so-called tube wave which corresponds to the zero frequency limit of the lowest radial mode of propagation in the fluid filling the borehole. Investigations of the necessary conditions to obtain a tube wave and of its propagation were performed on a laboratory model of a borehole and in boreholes in situ. The results obtained show the possibility of a practical use of the method investigated for the determination of the mean velocities of shear waves in the rock mass surrounding the borehole. |
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| ISSN: | 0137-5075 2300-262X |