동적수치해석을 이용한 액상화 기초지반 위 철도제방의 제방높이와 입력주파수에 따른 침하량 평가

다국어 초록 (Multilingual Abstract)

This study quantitatively evaluates the effects of embankment height and input excitation frequency on crest settlement—a key damage indicator—for railway embankments founded on liquefiable ground. Dynamic numerical analyses were conducted using FLAC2D, based on the cross-section adopted in a previous 1-g shaking table test. The parametric study considered four embankment heights (0, 2, 4, and 6 m) and three input frequencies (0.8, 2.5, and 5.0 Hz). To simulate liquefaction in the foundation soil, the PM4Sand constitutive model was employed within an effective-stress framework. Model validity was first examined by comparing computed time histories of excess pore-water pressure, acceleration, and settlement with experimental results, and by confirming qualitative agreement with observed settlement trends across different embankment heights. The results show that crest settlement does not increase monotonically with embankment height; instead, it reaches a maximum and then decreases beyond a critical range. The largest settlement occurs when the embankment height is approximately 15~25% of the liquefiable layer thickness. This behavior reflects the competition between increased overburden pressure, which enhances liquefaction resistance beneath the embankment, and amplified lateral spreading, which increases permanent deformation. Although excitation frequency influences settlement, its effect is smaller than that of embankment height.

목차 (Table of Contents)

• / A B S T R A C T /
• 1. 서 론
• 2. 동적수치해석 개요 및 해석모델의 검증
• 2.1 동적수치해석 개요
• 2.2 동적수치해석 모델의 검증
• 3. 제방높이 및 주파수 변화에 따른 철도제방의침하 거동
• 3.1 제방높이 변화에 따른 철도제방의 침하량 분석
• 3.2 입력주파수 변화에 따른 철도제방의 침하량 분석
• 4. 결 론
• / 감사의 글 /
• / REFERENCES /