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Journal of the Korean Society of Hazard Mitigation 2014;14(1):145-154.
Published online February 28, 2014.
토목섬유 매트 파손이 방조제 내 준설성토에 미치는 영향
이충원, 장동수, 박성용, 김용성
Influence of Damaged Geosynthetic Mat to Dredged Sea Sand Fill inside a Tide Embankment
Chung-Won Lee, Dong-Su Chang, Sung-Yong Park, Yong-Seong Kim
Abstract
In order to investigate the behavior of dredged sea sand fill compacted inside tide embankments with damaged geosynthetic mat, centrifugal model tests were conducted with sea level variations. Results of vertical displacements, investigation by observation and excavation, and image analysis from the three centrifugal model tests considering particle size conditions of rubble mound and filter layers, and damage of geosynthetic mat were examined. The results demonstrate that the subsidence of the dredged sea sand fill inside tide embankments with the damaged geosynthetic mat was strongly affected by the loss of dredged sea sand into the filter layers for large filter particles and by a decrease in the bearing capacity of the filter layers for small filter particles.
Key Words: Sea level variation; Damaged geosynthetic mat; Loss of dredged sea sand; Centrifugal model test
요지
토목섬유 매트가 파손된 경우의 방조제 내측에 시공된 준설성토의 거동을 분석하기 위하여 조위승강을 고려한 원심모형실험을 실시하였다. 이를 위하여 모형방조제의 필터재층 및 사석의 입도조건, 토목섬유 매트의 파손여부를 고려하여 3개 Case의 원심모형실험을 수행하였으며, 각 Case에 대하여 연직변위의 계측, 관찰 및 굴착조사와 함께 화상해석을 실시하였다. 실험 결과, 토목섬유 매트의 파손을 전제로 필터재의 입경이 상대적으로 크면 준설해사의 유실이, 반대의 경우에는 필터재층의 지지력 감소가 준설성토의 주된 침하원인으로 판단되었다.
핵심용어: 조위승강; 토목섬유 매트 파손; 준설성토 유실; 원심모형실험
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