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Research Article

Experimental Study on the Pullout Resistance Characteristics of Geogrid under Cyclic Loading

반복하중 효과로 인한 지오그리드의 인발저항 특성 평가에 관한 실험적 연구

Wooseok Shin1*
,
Jonghyun Kim1
,
Chungsik Yoo2
신 우석1*
,
김 종현1
,
유 충식2
1Member, Graudate Student, Dept. of Construction Systems Engineering, Sungkyunkwan University, Natural Science Campus, Cheoncheon-dong, Jangan-gu, Suwon-si, Gyeongg-do 16419, Republic of Korea
2Member, Professor, Dept. of Construction Systems Engineering, Sungkyunkwan University, Natural Science Campus, Cheoncheon-dong, Jangan-gu, Suwon-si, Gyeongg-do 16419, Republic of Korea
*Corresponding Author
30 March 2025. pp. 39-50
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Abstract

The retaining wall with reinforced soil is exposed to various types of loads, including static active earth pressure caused by the self-weight of the backfill soil, seismic loads due to earthquakes, vehicle/railroad loads, and cyclic loads induced by seasonal temperature changes causing contraction/expansion. To ensure the internal stability of the retaining wall, the pullout resistance of the installed geogrid must be secured. This study presents the pullout load test results for a geogrid installed in sandy soil under cyclic loading, either in displacement-controlled or load-controlled conditions. In the pullout tests, factors such as the frequency, amplitude, and number of cycles of the pullout load were varied to consider various cyclic loading characteristics. The trends in the maximum pullout resistance and the initial pullout stiffness were analyzed. The analysis showed that under displacement-controlled cyclic loading, as the amplitude increased, both the pullout resistance and stiffness significantly decreased, with the degree of decrease intensifying as the displacement amplitude increased. This trend was also observed in the analysis of changes in pullout stiffness under cyclic loading. On the other hand, under load-controlled cyclic loading, the pullout resistance and cumulative pullout displacement both tended to decrease as the frequency increased over a fixed period, while the pullout resistance decreased and the cumulative displacement increased as the amplitude increased.

Keywords
Geosynthetic
Cyclic loading
Pullout test
Geogrid
Geosynthetic-reinforced retaining wall

보강토 옹벽은 뒤채움 흙의 자중으로 발생하는 정적인 주동토압뿐만 아니라 지진으로 인한 지진하중, 차량/철도 하중 또는 계절별 온도변화에 기인한 수축/팽창으로 인한 반복하중 등 다양한 형태의 하중에 노출되며 옹벽의 내적 안정성 확보를 위해서는 포설된 지오그리드의 인발저항이 확보되어야 한다. 이에 본 연구에서는 변위제어 혹은 하중제어 형태로 반복작용이 작용하는 모래지반에 포설된 지오그리드에 대한 인발하중 시험 결과를 제시하였다. 인발시험에서는 인발하중의 주파수 및 진폭, 그리고 반복 횟수 등을 변화시켜 다양한 반복하중 특성을 고려하였으며 이에 따른 최대 인발저항력 및 일발 강성도 등의 변화 경향을 분석하였다. 분석 결과 변위제어 반복하중 작용 시에는 진폭의 증가함에 따라 인발저항과 강성도가 현저히 감소하는 것으로 분석되었으며 감소 정도는 변위 진폭이 증가하면서 감소하는 것으로 검토되었다. 이러한 경향은 반복하중 작용 시 인발 강성도 변화 경향 분석에서도 고찰되었다. 한편, 하중제어로 작용한 반복하중 작용 시 일정한 시간 동안 주파수가 증가할수록 인발저항력과 누적 인발변위는 모두 감소하는 경향을 보였으며, 진폭이 증가할수록 인발저항력은 감소하고 누적 인발변위는 증가하는 것으로 나타났다.

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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 24
  • No :1
  • Pages :39-50
  • Received Date : 2024-12-17
  • Revised Date : 2025-02-11
  • Accepted Date : 2025-02-12
  • DOI :https://doi.org/10.12814/jkgss.2025.24.1.039
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