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2026 Vol.36, Issue 3 Preview Page

Research Article

Numerical Evaluation of Dynamic Behavior of Soft Soil Reinforced with Granular Compaction Piles

수치해석을 통한 쇄석다짐말뚝 보강 연약지반의 동적 거동 평가

Junghwan Lee1
,
Yihyuk Kwon2
,
Hyeok Seo3*
이 정환1
,
권 이혁2
,
서 혁3*
1Assistant Professor, Department of Civil & Environmental Engineering, Dongshin University
2Director, Civil Engineering Design Division, Wonwoo Technological Development Co., Ltd.
3Assistant Professor, Department of Civil & Environmental Engineering, Honam University
1동신대학교 토목환경공학과 조교수
2㈜원우기술개발 토목설계부 이사
3호남대학교 토목환경공학과 조교수
*Corresponding Author
30 September 2026. pp. 477-489
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Abstract

In this study, numerical analyses were performed to evaluate the seismic performance and dynamic behavior of soft ground reinforced with granular compaction piles (GCP). Based on the acceleration responses obtained from 1 g shaking table model tests (1/40 scale), 1D ground response analysis using DEEPSOIL was conducted to verify the dynamic response of the model ground. Subsequently, 2D nonlinear time history analyses were performed using MIDAS GTS NX on a prototype scale soft ground under various seismic motions, including short-period (Ofunato), long-period (Hachinohe), domestic recorded motions (Gyeongju, Pohang), and artificial waves. The 1D ground response analysis results showed spectral acceleration differences ranging from 5.76 to 29.90% compared to the laboratory tests, demonstrating consistent amplification tendencies across the frequency domain. From the 2D finite element analysis, the GCP-reinforced ground showed a significant reduction in peak ground acceleration (PGA) at the ground surface by 12.82 to 49.81% under natural earthquake motions. However, under the artificial wave with high-frequency and large amplitude characteristics, the surface PGA slightly increased by 2.37%, indicating that the reinforcement efficiency depends on the dominant frequency of input ground motions. These findings demonstrate the necessity of performing dynamic time history analysis that accounts for site-specific frequency characteristics when designing granular compaction piles.

Keywords
granular compaction pile
ground response analysis
time history analysis
peak ground acceleration
soft ground

본 연구에서는 쇄석다짐말뚝(GCP)으로 보강된 연약지반의 내진 성능 및 동적 거동 특성을 평가하기 위해 수치해석적 검증을 수행하였다. 상사법칙(1/40)을 적용한 1 g 진동대 실내모형실험의 가속도 응답 결과를 바탕으로 1차원 지반응답해석 프로그램인 DEEPSOIL을 활용하여 지반-지진파 응답 특성을 검증하였다. 이후 2차원 유한요소해석 프로그램(MIDAS GTS NX)을 이용하여 실제 현장 규모의 연약지반에 대해 단주기, 장주기, 국내 관측 지진파(경주, 포항) 및 인공지진파를 적용한 비선형 시간이력해석을 수행하였다. 1차원 지반응답해석 결과, 실내모형실험 대비 스펙트럼 가속도에서 5.76–29.90%의 차이를 보였으나 주파수 대역별 가속도 증폭 경향성은 매우 유사하게 나타났다. 2차원 시간이력해석 결과, 쇄석다짐말뚝으로 보강된 지반은 대부분의 실관측 지진파에서 최대지반가속도(PGA)가 지표 최상부 기준 12.82–49.81% 감소하여 뚜렷한 진동 저감 및 지반 보강 효과를 확인하였다. 반면 고주파수 및 대진폭 성분이 우세한 인공지진파의 경우 보강 후 지표 가속도가 약 2.37% 소폭 증가하여 입력지진파의 주파수 특성에 따라 보강 효율이 달라질 수 있음을 규명하였다. 따라서 연약지반 내 쇄석다짐말뚝 설계 시 입력지진파의 주파수 대역과 부지 고유 특성을 종합적으로 고려한 동적 해석이 수반되어야 함을 제시하였다.

키워드
쇄석다짐말뚝
지반응답해석
시간이력해석
최대지반가속도
연약지반
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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 : 36
  • No :3
  • Pages :477-489
  • Received Date : 2026-08-19
  • Revised Date : 2026-09-18
  • Accepted Date : 2026-09-21
  • DOI :https://doi.org/10.9720/kseg.2026.3.477
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