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2025 Vol.41, Issue 6 Preview Page
Site Classification-Based Shear Wave Velocity Distribution and Depth-Dependent COV Models for Soils for Seismic Design

내진설계를 위한 지반분류별 전단파속도 분포 특성 및 깊이에 따른 전단파속도의 변동계수 모델식 제안

Hyun-Ju Oh1
,
Du-San Bae2
,
Hyung-Choon Park3*
오 현주1
,
배 두산2
,
박 형춘3*
1Member, Doctoral Student, Dept. of Civil Engineering, Chungnam National Univ.
2Member, Master’s Degree, Dept. of Civil Engineering, Chungnam National Univ.
3Member, Prof., Dept. of Civil Engineering, Chungnam National Univ.
1정회원, 충남대학교 토목공학과 박사과정
2정회원, 충남대학교 토목공학과 석사
3정회원, 충남대학교 토목공학과 교수
*Corresponding Author
31 December 2025. pp. 19-28
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Abstract

Soil shear wave velocity (Vs) profiles govern seismic wave amplification and attenuation and thus strongly influence seismic design. Due to time and cost constraints, practitioners often use the average of a limited number of Vs profiles, which neglects spatial variability. This uncertainty can be addressed using reliability-based probabilistic analysis that generates random Vs fields via statistical methods and applies Monte Carlo simulation or coefficient of variation (COV)-based evaluation. Using 160 downhole test datasets from site development in Sejong City, sites were classified by the average Vs of the upper soil layer (Vs, soil). The sites were classified into three soil profile types: S2 (55 cases), S3 (16 cases), and S4 (89 cases). For each class, 243 (S2), 193 (S3), and 243 (S4) possible Vs profiles were generated. The distribution characteristics of Vs were assessed for each soil classification, and depth-dependent COV models applicable to reliability-based seismic analyses are proposed.

Keywords
Random field
Reliability-based analysis
Shear wave velocity (Vs)
Soil profile type

지반의 전단파속도(Vs) 주상도는 내진설계에 있어 지진파의 증·감폭 특성을 결정짓는 핵심 요소이다. 그러나 시간·경제적 제약으로 인해 충분한 수의 지반조사를 수행하기 어려워, 실무에서는 제한된 횟수의 조사를 통해 얻은 전단파속도 주상도의 평균을 대표값으로 사용하게 된다. 이는 지반 물성치의 공간적 변동성을 고려하지 못해, 지진 시 실제 지반 거동과 해석 결과 사이에 차이를 유발할 수 있다. 이러한 불확실성은 확률론 기반의 신뢰성 해석을 통해 반영할 수 있으며, 통계적 방법을 활용해 전단파속도 랜덤 필드를 생성하고, 이를 바탕으로 몬테카를로 시뮬레이션이나 변동계수(COV)를 활용한 해석을 수행할 수 있다. 본 연구에서는 세종특별자치시 부지조성 단계에서 수행된 160개의 다운홀 시험 데이터를 활용하여, 토층 평균 전단파속도(Vs,soil)를 기준으로 S2 지반(55개), S3 지반(16개), S4 지반(89개)으로 분류하였다. 이후 각각에 대해 존재 가능한 전단파속도 주상도 243개(S2), 193개(S3), 243개(S4)를 생성하였으며, 이를 바탕으로 지반분류별 전단파속도 분포 특성을 평가하고, 깊이-전단파 속도 모델식을 제안하였으며, 신뢰성 기반 해석에 활용 가능한 깊이별 전단파속도 변동계수 모델식을 제안하였다.

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 41
  • No :6
  • Pages :19-28
  • Received Date : 2025-08-25
  • Revised Date : 2025-12-08
  • Accepted Date : 2025-12-09
  • DOI :https://doi.org/10.7843/kgs.2025.41.6.19
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