주변 흙의 특성이 물이 찬 매립된 배관에서 전파되는 기본 유도 종파 모드 감쇠에 미치는 영향
Effect of Surrounding Soil Properties on the Attenuation of the First Guided Longitudinal Wave Mode Propagating in Water-filled, Buried Pipes
0
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
This study presents the attenuation characteristics of the first guided longitudinal wave mode propagating in water-filled, buried steel pipes in order to investigate the effects of soil saturation and compaction on the attenuation patterns. For numerical calculation of attenuation, 10different combinations of S-wave velocity, P-wave velocity, and soil densities were considered. From the attenuation dispersion curves, which were obtained using Disperse software, we determined that the attenuation decreases as saturation increases, whereas it increases as compaction increases. Over the frequency range from 0.2 to 0.4 MHz, the first longitudinal wave mode has attenuations that are relatively lower than for other ranges,is faster than the first flexural wave mode, and is sensitive to defects aligned in the axial direction. Hence, the first longitudinal wave mode over the mentioned frequency range would be the proper choice for long-range buried pipelines that transport water.
Abstract
This study presents the attenuation characteristics of the first guided longitudinal wave mode propagating in water-filled, buried steel pipes in order to investigate the effects of soil saturation and compaction on the attenuation patterns. For numerical calculation of attenuation, 10different combinations of S-wave velocity, P-wave velocity, and soil densities were considered. From the attenuation dispersion curves, which were obtained using Disperse software, we determined that the attenuation decreases as saturation increases, whereas it increases as compaction increases. Over the frequency range from 0.2 to 0.4 MHz, the first longitudinal wave mode has attenuations that are relatively lower than for other ranges,is faster than the first flexural wave mode, and is sensitive to defects aligned in the axial direction. Hence, the first longitudinal wave mode over the mentioned frequency range would be the proper choice for long-range buried pipelines that transport water.
참고문헌 (9)
- 이주원, "매립된 파이프에서 유도초음파의 종파 모드 특성", 한국전산구조공학회 정기학술대회, pp.674~677 (2010), 한국전산구조공학회
- Adamo, F, "Soil Moisture Assessment by Means of Compressional and Shear Wave Velocities: Theoretical Analysis and Experimental Setup", Measurement, 43, pp.344~352 (2010)
- Das,B.M, "Principles of Geotechnical Engineering", pp.2002, Brooks
- Fratta, D, "Combined TDR and P-Wave Velocity Measurements for the Determination of In Situ Soil Density-Experimental Study", Geotechnical Testing Journal, 28(6), pp.1~11 (2005)
- Kwun, H, "Torsional Guided-Wave Attenuation in Coal-Tar-Enamel- Coated, Buried Piping", NDT&E International, 37, pp.663~665 (2004)
- 이주원, "Mode Selection of Leaky Lamb Waves in Steel Plate", 한국해양공학회지, 22(1), pp.6~12 (2008), 한국해양공학회
- Long, R, "Attenuation Characteristics of the Fundamental Modes that Propagating in Buried Iron Water Pipes", Ultrasonics, 41, pp.509~519 (2003)
- Lu, Z, "Effects of Compaction on the Acoustic Velocity in Soils", Soil Science Society of America Journal, 68, pp.7~16 (2004)
- 나원배, "Attenuation of Fundamental Longitudinal Cylindrical Guided Wave Propagating in Liquid-Filled Steel Pipes", 한국해양공학회지, 19(5), pp.26~33 (2005), 한국해양공학회