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A study on the Factors Affected on the P- and S-wave Velocity Measurement of the Acrylic and Stainless Steel Core

아크릴 및 스테인리스강 시험편의 P-, S-파 속도 산출에 미친 영향 요인 고찰

  • Lee, Sang-Kyu (Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Lee, Tae-Jong (Korea Institute of Geoscience and Mineral Resources (KIGAM))
  • Received : 2011.09.26
  • Accepted : 2011.10.30
  • Published : 2011.11.30

Abstract

A total of 864 measurements for P- and S- wave velocity of acrylic and stainless steel core samples have been performed with respect to their lengths and axial load applied. S-wave velocity measurement was much harder than P-wave velocity, so that it showed higher deviation in measured S-wave velocity with respect to repeated measurement, length of the cores, and the axial load applied. Velocity measurements for acrylic cores showed more stable and less than half of the variation between the measurements than the stainless steel cores. This seems to be come from better coupling between the transducers and acrylic cores than stainless cores, and from larger value of the first arrival time in a similar system noise environments. From the analysis of the 864 measurements, it is recommended that the length of the core be 60 ~ 90 mm, axial load between 20 kg (27.7 $N/cm^2$) and 30 kg (41.6 $N/cm^2$) for measurement of wave velocity of the acrylic and stainless steel cores. Especially for measuring S-wave velocity of stainless steel core, core length should be less than 50 mm, otherwise it will be affected by mode conversion or others. These results can be used in measurement and correction for system delay in wave velocity measurement for rock cores.

Acknowledgement

Grant : 저온 지열 열병합 발전에 활용가능한 심부 지열수자원 확보기술 개발

Supported by : 한국지질자원연구원

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