Laboratory Model Tests on the Bearing Capacity and Lateral Deformation Behavior of Gravel Compaction Piles Considering High-Strength Geogrid Confinement

Junghwan Lee; Hyeok Seo

doi:10.9720/kseg.2025.4.775

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2025 Vol.35, Issue 4 Preview Page Next Page

Research Article

Laboratory Model Tests on the Bearing Capacity and Lateral Deformation Behavior of Gravel Compaction Piles Considering High-Strength Geogrid Confinement 실내모형시험을 통한 고강도 지오그리드 구속효과에 따른 쇄석다짐말뚝의 지지력 및 횡변형 거동

31 December 2025. pp. 775-785

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Abstract

We investigated the load-bearing capacity and deformation characteristics of soft ground reinforced with gravel compaction piles (GCPs) and geogrid reinforced gravel compaction piles (GRGCPs). Scaled laboratory tests were conducted on sandy (SP) and silty (ML) ground conditions, focusing on single and grouped pile arrangements. Load-settlement, horizontal displacement, and failure patterns were analyzed. The GRGCPs exhibited ~1.20–1.98 greater load-bearing capacity than the GCPs, and the grouped piles supported ~1.73–3.45 times higher loads than single piles. Furthermore, the confinement effect of the high-strength geogrid effectively reduced horizontal displacement and mitigated bulging failure. These findings demonstrate that the GRGCP method not only improves the load-bearing capacity, but also increases the lateral stability of soft ground.

Keywords

gravel compaction pile

geogrid reinforcement

soft ground, bearing capacity

deformation characteristics

laboratory model test

본 연구에서는 쇄석다짐말뚝(gravel compaction pile, GCP)과 고강도 지오그리드로 보강된 쇄석다짐말뚝(geogrid reinforced gravel compaction pile, GRGCP) 공법을 적용하여 연약지반의 지지력 및 변형 특성을 비교·분석하였다. 실내모형시험은 사질토(SP) 및 점성토(ML) 조건에서 수행되었으며, 단말뚝과 군말뚝을 대상으로 하중–침하 관계, 수평변위 및 파괴형상을 관찰하였다. 시험 결과, GRGCP는 GCP에 비해 약 1.20–1.98배 높은 하중 지지력을 보였으며, 군말뚝의 경우 단말뚝 대비 약 1.73–3.45배 큰 하중을 지지하는 것으로 나타났다. 또한 GRGCP는 지오그리드의 구속효과로 인해 수평변위가 감소하고, 횡방향 팽창(bulging) 파괴가 억제되는 경향을 보였다. 이상의 결과를 통해 GRGCP 공법은 연약지반의 지지력 향상뿐 아니라 횡방향 변형 저감에도 효과적인 공법임을 확인하였다.

키워드

쇄석다짐말뚝

지오그리드 보강

연약지반

지지력

변형특성

실내모형시험

References

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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 : 35
No :4
Pages :775-785
Received Date : 2025-11-05
Revised Date : 2025-12-24
Accepted Date : 2025-12-24
DOI :https://doi.org/10.9720/kseg.2025.4.775

The Journal of Engineering Geology ISSN:1226-5268(Print) 2287-7169(Online) 지질공학

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