All Issue

2025 Vol.41, Issue 5 Preview Page
Stability of Soundproof Wall Foundations and the Reinforcement Effect of Micropiles

방음벽 기초의 안정성 및 마이크로파일 보강효과

Sung-Wook Choi1
,
Young-Min Kim2
,
Kang-Il Lee3*
최 성욱1
,
김 영민2
,
이 강일3*
1Member, Ph.D., Dept. of Civil Engineering and Environment Engineering, Daejin Univ.
2Member, Ph.D. Student, Dept. of Smart City and Construction Convergence Engineering, Daejin Univ.
3Member, Prof., Dept. of Smart Construction and Environmental Engineering, Daejin Univ.
1정회원, 대진대학교 토목환경공학과 박사
2정회원, 대진대학교 스마트시티건설융합공학과 박사과정
3정회원, 대진대학교 스마트건설환경공학과 교수
*Corresponding Author
31 October 2025. pp. 21-29
PDF XML Citation
Abstract

This study numerically examines the stability of soundproof wall foundations on sloped ground and evaluates the reinforcement effect of micropiles in situations where stability is compromised. Analysis using the strength reduction method revealed that front slopes steeper than 1:1.5 (approximately 33.3°) jeopardize foundation stability. The effectiveness of micropile reinforcement was assessed in terms of reductions in settlement and lateral displacement relative to pile length (L). The results indicated that significant displacement reduction occurred when the ratio of pile length to diameter (L/D) ≤ 30, with an optimal reinforcement range identified as 15 ≤ L/D ≤ 30, taking economic efficiency into account.

Keywords
Installation depth
Micropile
Soundproof wall foundation

본 연구는 방음벽 기초가 설치되는 사면의 앞굽 경사에 따른 기초의 안정성을 수치해석을 통해 분석하고, 안정성이 확보되지 않는 조건에서 마이크로파일의 보강 효과를 정량적으로 평가하였다. 강도감소법을 이용한 사면안정 해석 결과, 앞굽 경사가 1:1.5(약 33.3°)를 초과할 경우 기초 안정성이 확보되지 않았으며, 이에 마이크로파일을 설치하여 파일 설치 길이(L)에 따른 기초의 침하 및 수평변위 저감 효과를 분석하였다. 그 결과, 파일 설치 길이에 따른 변위 감소율은 L/D ≤ 30 범위 내에서 뚜렷하게 나타났으며, 경제적 측면을 고려할 때 15 ≤ L/D ≤ 30이 적정한 보강 길이로 판단된다.

References
1

Bruce, D.A. and Juran, I. (1997), “Drilled and Grouted Micropiles: State-of-Practice Review, Volume III – Construction, QA/QC, and Testing”, U.S. Department of Transportation, Federal Highway Administration, Publication No. FHWA-RD-96-018, pp.1-162.

2

FHWA (2005), “Micropile Design and Construction”, United States Department of Transportation, No. FHWA NHI-05-039, pp.5-1~5-18.

3

Huh, I.G., Hwang, T.H., Lee, S.R., Shin, J.H., and Kwon, O.Y. (2008), “Reduction of Differential Settlements due to Deep Excavation Using the Micro-piling Method”, Journal of the Korean Geotechnical Society, Vol.24, No.10, pp.71-81.

10.7843/KGS.2008.24.10.71
4

Hwang, T.H. and Kwon, O.Y. (2011), “Installation Methods of Micro-piles according to Pile Length Ratio and Location of Bedrock Layer”, Journal of the Korean Geotechnical Society, Vol.27, No.4, pp.5-20.

10.7843/kgs.2011.27.4.005
5

Jang, C.H., Kim, M.Y., and Hwang, T.H. (2024), “Reinforcing Effect of Micropiles According to the Cohesive Characteristics of the Soil Layer Beneath Foundations”, Journal of the Korean Geotechnical Society, Vol.40, No.2, pp.41-53.

10.7843/KGS.2024.40.2.41
6

KEC (2009), “Road Design Manual, Volume 2: Earthworks and Drainage”, Korea Expressway Corporation, Document No. AN01145-000145-12.

7

KR (2012), “Working Stress Design Method”, KR-Network, Korea, pp.5-6.

8

Lee, T.H. and Im, J.C. (2006), “An Experimental Study on the Reinforcement Effect of Installed Micropile under Footing on Dense Sand”, Journal of the Korean Society of Civil Engineers, Vol.26, No.3C, pp.191-200.

9

MOLIT (2020), “Design Standard for Cut-and-Fill Slopes (KDS 11 70 05:2020)”, Design Standards for Construction Works, Korea, August 18, 2020.

10.1177/036063252005001107
10

MLTM (2010), “Standard Drawings for Soundproof Wall Foundations”, Document No. 11-1611000-001395-01.

11

Narsavage, P. (2022), “Task 6 – Noise Barrier Foundation Design Final Report”, E.L. Robinson Engineering, prepared for the Ohio Department of Transportation and the U.S. Department of Transportation, Federal Highway Administration, Agreement No. 34652, July 2022, pp.1-8, https://doi.org/10.13140/RG.2.2.16833.88162.

10.13140/RG.2.2.16833.88162
12

WSDOT (2013), “Geotechnical Design Manual – Chapter 17: Foundation Design for Signals, Signs, Noise Barriers, Culverts, and Buildings”, Geotechnical Design Manual, Vol. M 46-03.08, Washington State Department of Transportation, Olympia, WA, pp.17-1~17-32.

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 :5
  • Pages :21-29
  • Received Date : 2025-07-25
  • Revised Date : 2025-09-01
  • Accepted Date : 2025-09-02
  • DOI :https://doi.org/10.7843/kgs.2025.41.5.21
Journal Informaiton Journal of the Korean Geotechnical Society Journal of the Korean Geotechnical Society
Archives
: Vol.23~28 (2007~2012)
  • NRF
  • KOFST
  • KISTI Current Status
  • KISTI Cited-by
  • crosscheck
  • orcid
  • open access
  • ccl
Journal Informaiton Journal Informaiton - close