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2022 Vol.32, Issue 4 Preview Page

Research Article

Estimation of the Depth of Embedded Sheet Piles Using Two Types of Geophysical Loggings

다종 물리검층을 통한 시트파일 근입 심도 추정 연구

Sungpil Hwang1
,
Wooseok Kim1*
,
Jaehyeung Jeoung2
,
Kiju Kim3
,
Byungsuk Park1
,
Chulhee Lee4
황 성필1
,
김 우석1*
,
정 재형2
,
김 기주3
,
박 병석1
,
이 철희4
1Senior Researcher, Department of Geotechnical Engineering Research, KICT
2Research Fellow, Department of Geotechnical Engineering Research, KICT
3CEO, BEarth, Inc.
4CEO, ASIAGEO Co., Ltd.
1한국건설기술연구원 지반연구본부 수석연구원
2한국건설기술연구원 지반연구본부 연구위원
3(주)비어스 대표이사
4(주)아시아지오 대표이사
*Corresponding Author
31 December 2022. pp. 525-534
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Abstract

This investigation used two different geophysical logging techniques to confirm the depth to which a sheet pile was driven. Depth was estimated through analysis of the movement speed and three-component movement directions of a P-wave transmitted through the ground. It was also estimated by pole-pole and pole-dipole methods using electrical data logging to measure apparent resistivity. The two methods’ respective results were 9.0 m (±1.5 m) and 7.5 m. As field ground conditions will include mixtures of various materials, electrical data logging is judged to be suitable for assessing depth due to its low signal-to-noise ratio.

Keywords
down hole test
P-wave
electric logging
depth of embedded pile
geophysical logging

지반 내부에 설치된 시트파일(sheet pile)의 근입 심도 확인을 위해 두 종류의 탐사기법을 활용하여 조사를 수행하였다. 탄성파탐사 원리를 활용하여 지반을 통해 전달되는 P파의 이동 속도 및 3성분 운동방향 분석을 통해 근입 심도를 추정하였다. 또한 시추공내의 전극배열에 따른 겉보기 비저항을 측정하는 전기 검층의 원리를 활용하여 단극-단극(pole-pole) 방법과 단극-쌍극(pole-dipole) 방법으로 각각 분석하여 근입 심도를 추정하였다. 그 결과, P파 검층에서 근입 심도는 9.0 m (±1.5 m), 전기검층에서 근입 심도는 7.5 m로 확인되었다. 다양한 물질들이 지반 내부에 존재하는 현장의 특성 상 전기탐사의 노이즈가 적어 탐사에 적합한 것으로 판단된다.

키워드
탄성파탐사
P파
전기검층
파일근입 심도
물리검층
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 32
  • No :4
  • Pages :525-534
  • Received Date : 2022-11-18
  • Accepted Date : 2022-11-28
  • DOI :https://doi.org/10.9720/kseg.2022.4.525
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