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2026 Vol.36, Issue 2 Preview Page

Research Article

Behavioral Analysis of Retaining Walls in Colluvial and Talus Layers Based on Field Monitoring and Ground Properties

Talus를 포함한 붕적토층에 시공된 절토부옹벽의 지반 특성 및 계측 기반 거동 분석

Jaehyu Mun1
,
Hyeok Seo2
,
Daehyeon Kim3*
문 재휴1
,
서 혁2
,
김 대현3*
1Graduated Student, Department of Civil Engineering, Chosun University
2Assistant Professor, Department of Civil & Environmental Engineering, Honam University
3Professor, Department of Civil Engineering, Chosun University
1조선대학교 토목공학과 박사과정
2호남대학교 토목환경공학과 조교수
3조선대학교 토목공학과 교수
*Corresponding Author
30 June 2026. pp. 263-275
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Abstract

This study was conducted to investigate the causes of displacement in a cut-slope retaining wall constructed on colluvial soil layers containing Talus in the Yeosu area. To analyze the wall displacement mechanism occurring during the construction phase, a comprehensive geotechnical investigation was performed, including electrical resistivity surveys, groundwater flow direction and velocity tests, and monitoring of inclinometers and groundwater level gauges. The results indicated that groundwater stagnation occurred during rainfall at the interface between the highly permeable colluvial soil and the underlying low-permeability weathered soil. In particular, the rapid rise in groundwater level to the foundation depth (EL. 65–74 m) immediately following heavy rainfall (daily precipitation exceeding 55.3 mm) was analyzed as a major factor inducing displacement by increasing backfill water pressure. Inclinometer analysis revealed a maximum frontal displacement of 18.8 mm in the No.6+0.0 section, showing a close correlation with localized groundwater concentration due to topographical catchment characteristics. These findings suggest that fluctuations in groundwater levels, driven by the hydraulic properties of soil layers in complex grounds such as colluvial soil, can significantly impact structural stability. Therefore, it is essential to establish effective drainage systems, such as horizontal drains, along with stability reviews for each construction stage.

Keywords
colluvial soil
talus
groundwater level
field instrumentation
displacement of retaining wall

본 연구는 여수 지역의 Talus를 포함한 붕적토층에 시공된 절토부옹벽에서 발생한 변위의 원인을 규명하기 위해 수행되었다. 시공 단계에서 발생한 벽체 변위 메커니즘을 분석하고자 전기비저항 탐사, 유향·유속 시험, 지중경사계 및 지하수위계 계측을 포함한 종합적인 지반조사를 실시하였다. 분석 결과, 투수성이 높은 붕적토층과 하부의 저투수성 풍화토 경계면에서 강우 시 지하수 정체 현상이 발생하는 것으로 나타났다. 특히 일강수량 55.3 mm 이상의 집중호우 직후 지하수위가 옹벽 기초부 심도(EL.65–74 m)까지 급격히 상승하며 배면 수압을 증대시킨 것이 변위 발생을 유도하는 주요 원인으로 분석되었다. 지중경사계 분석 결과 No.6+0.0 구간에서 최대 18.8 mm의 전면 변위가 관측되었으며, 이는 지형적 집수 특성에 따른 국지적 지하수 집중 현상과 밀접한 상관관계를 보였다. 이러한 결과는 붕적토 등 복합 지반 내 옹벽 설계 시 지층의 수리적 특성에 따른 지하수위 변동이 구조물 안정성에 지대한 영향을 미칠 수 있음을 시사하며, 향후 시공 단계별 안정성 검토와 수평배수공 등 효율적인 배수 체계 수립이 필수적임을 보여준다.

키워드
붕적토층
애추
지하수위
현장계측
옹벽변위
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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 :2
  • Pages :263-275
  • Received Date : 2026-04-09
  • Revised Date : 2026-04-27
  • Accepted Date : 2026-04-28
  • DOI :https://doi.org/10.9720/kseg.2026.2.263
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