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2023 Vol.33, Issue 2 Preview Page

Research Article

Earthquake Amplification for Various Multi-Layer Ground Models

다양한 다층 지반모형에 대한 지진동 증폭

Sugeun Jeong1
,
Hoyeon Kim1
,
Daeheyon Kim2*
정 수근1
,
김 호연1
,
김 대현2*
1Ph.D. Student, Department of Civil Engineering, Chosun University
2Professor, Department of Civil Engineering, Chosun University
1조선대학교 토목공학과 박사과정
2조선대학교 토목공학과 교수
*Corresponding Author
30 June 2023. pp. 293-305
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Abstract

Three ground models are analyzed using a 1g shaking table and laminar shear box (LSB) to investigate the impact of the ground structure on seismic wave amplification during earthquakes. Multi-layer horizontal, embankment, and basin ground models are selected for this investigation, with each model being divided into dense and loose ground layers, Accelerometers are installed during the construction of each ground model to capture any seismic wave amplification owing th the propagation of an artificial seismic wave, sine wave sweep, and 10-Hz sine wave through a given ground model. The amplification of the tested seismic waves is analyzed using the observed peak ground acceleration and spectrum acceleration. The observed acceleration amplification in the multi-layer horizontal ground model is significantly higher the seismic waves that propagated across the dense ground-loose ground boundary compared with those that only propagated through the dense ground. Furthermore, the observed acceleration amplification gradually increases in the central part of the multi-layer embankment and basin models for the seismic waves that propagated across the dense ground-loose ground boundary.

Keywords
1g shaking table
amplification phenomenon
multilayered ground
PGA
spectrum acceleration

지진이 발생할 때 대한 지진동 증폭 현상을 확인하기 위해 1g 진동대와 연성토조(Laminar Shear Box, LSB)를 이용하여 모형지반을 조성하였고, 3가지 모델에 대하여 지진동 증폭현상에 대하여 확인하였다. 3가지의 모형지반을 선정하였으며 모든 모형지반에서 조밀한 층과 느슨한 층으로 나누었고, 지반모형의 경우는 다층 수평지반, 다층 제방지반, 다층 분지지반모형으로 선정하였다. 각 지반모형을 제작하며 가속도계 매설을 진행하였으며, 인공지진파, Sinesweep파와 Sine 10 Hz의 지진파를 통하여 증폭현상을 확인하였다. 최대지반가속도(Peak ground acclelration, PGA)와 응답스펙트럼 가속도(Spectrum acceleration, SA)를 통해 지진동 증폭현상을 확인하였다. 수평 다층지반에서 조밀한 지반을 통과 후 느슨한 지반에서 가속도 증폭이 조밀한 지반에 비해 크게 발생하는 것을 확인할 수 있었으며, 다른 두 모형지반에서는 층의 경계면을 통과 후 점차 중심부에서 가속도 증폭이 더 크게 발생하는 것을 확인할 수 있었다.

키워드
1g 진동대
증폭 현상
다층 수평지반
최대지반가속도
스펙트럼가속도
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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 : 33
  • No :2
  • Pages :293-305
  • Received Date : 2023-05-22
  • Revised Date : 2023-06-29
  • Accepted Date : 2023-06-29
  • DOI :https://doi.org/10.9720/kseg.2023.2.293
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