2024 KGS Fall Conference / Mar 21-22,Jeju,Korea
자갈도상 철도지반에서의 열화층 식별을 위한 GPR 시뮬레이션 프로그램 개발
Development of a GPR simulation program to identify fouled layer in ballast railway ground
Le, Dinh-Viet, Gyu Hyun Go*
Research objective
This study involves a developed Graphic User Interface (named as KIT-GPR) Program based on Finite Difference Time Domain (FDTD) of Ground Penetrating Radar (GPR) to detect the condition of railway ballast.
The program aims to provide accurate and reliable information about the ballast conditions, which is essential for maintaining the safety and efficiency of railway tracks.
Results of the KIT-GPR program were compared to gprMax software and measurement results of the ballast condition, showing compatibility and high accuracy.
![[Poster 2024 KGS Spring] 자갈도상 철도지반에서의 열화층 식별을 위한 GPR 시뮬레이션 프로그램 개발.png](https://static.wixstatic.com/media/d084f7_7f48fe583de240fdb96096a3b4885369~mv2.png/v1/fill/w_347,h_501,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/%5BPoster%202024%20KGS%20Spring%5D%20%EC%9E%90%EA%B0%88%EB%8F%84%EC%83%81%20%EC%B2%A0%EB%8F%84%EC%A7%80%EB%B0%98%EC%97%90%EC%84%9C%EC%9D%98%20%EC%97%B4%ED%99%94%EC%B8%B5%20%EC%8B%9D%EB%B3%84%EC%9D%84%20%EC%9C%84%ED%95%9C%20GPR%20%EC%8B%9C%EB%AE%AC%EB%A0%88%EC%9D%B4%EC%85%98%20%ED%94%84%EB%A1%9C%EA%B7%B8%EB%9E%A8%20%EA%B0%9C%EB%B0%9C.png)
2024 KGS Fall Conference / Mar 21-22,Jeju,Korea
국내 사질토의 부동수분 실험을 통한 경험적 모델식 산정
Empirical model based on unfrozen water content experiments of sandy soil in Korea
김희원, 고규현*
Research objective
지반의 동결과정을 모사하는 수치해석에서 부동수분은 주요 입력인자 중 하나로 평가되며, 신뢰성 있는 모델을 위해서는 다양한 조건에서 부동수분의 거동을 평가하는 것이 중요하다. 최근 해저지반, 암염층 등 지반의 간극수에 염분이 존재하는 시공 현장 범위가 늘어나면서, 기존의 담수조건에서 산정된 부동수분곡선으로는 염수지반의 동결과정을 모사하기에 정확성이 부족하다는 한계가 있다.
본 연구에서는 국내 사질토의 부동수분 실험을 수행하고, 이를 바탕으로 예측식을 구하는 것을 목표로 한다. 간극비와 간극수의 염분농도를 달리하여 실내실험을 수행하였으며, 이후 실험결과와 가장 적합한 모델을 선정하였다. 이후 모델 속 매개변수를 간극비, 간극수 염분농도의 함수로 대체하여 기존의 모델 식을 보다 사용하기 간편하도록 수정하였다.
![[Poster 2024 KGS Spring] 국내 사질토의 부동수분 실험을 통한 경험적 모델식 산정.png](https://static.wixstatic.com/media/d084f7_c9d7c529706649b697d9a21eb0acc4e2~mv2.png/v1/fill/w_90,h_127,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/%5BPoster%202024%20KGS%20Spring%5D%20%EA%B5%AD%EB%82%B4%20%EC%82%AC%EC%A7%88%ED%86%A0%EC%9D%98%20%EB%B6%80%EB%8F%99%EC%88%98%EB%B6%84%20%EC%8B%A4%ED%97%98%EC%9D%84%20%ED%86%B5%ED%95%9C%20%EA%B2%BD%ED%97%98%EC%A0%81%20%EB%AA%A8%EB%8D%B8%EC%8B%9D%20%EC%82%B0%EC%A0%95.png)
2024 KGS Fall Conference / Mar 21-22,Jeju,Korea
암석 형상 효과를 고려한 무작위 토양-암반 혼합 경사면 안정성 평가
Evaluation of Random Soil-Rock Mixture slope stability considering rock shape
Van-Hoa Cao, Gyu-Hyun Go*
Research objective
The slope composed of a mixture of soil and rock (SRM) is prevalent in mountainous regions, exhibiting complex mechanical behavior. Consequently, investigating the stability of such soil-rock mixture slopes is crucial to improve our ability to predict and prevent landslide disasters.
This study established a random Soil-Rock Mixture slope model based on random sequential addition (RSA). Besides, the strength reduction technique to calculate the safety factor of the soil-rock mixture slope using the finite element method in ABAQUS software was implemented. The influence of rock shape on slope stability and the complexity of the failure surface was discussed.
![[Poster 2024 KGS Spring] 암석 형상 효과를 고려한 무작위 토양-암반 혼합 경사면 안정성 평가.png](https://static.wixstatic.com/media/d084f7_e1c73152e45d44e8be70155a9d1a305f~mv2.png/v1/fill/w_347,h_501,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/%5BPoster%202024%20KGS%20Spring%5D%20%EC%95%94%EC%84%9D%20%ED%98%95%EC%83%81%20%ED%9A%A8%EA%B3%BC%EB%A5%BC%20%EA%B3%A0%EB%A0%A4%ED%95%9C%20%EB%AC%B4%EC%9E%91%EC%9C%84%20%ED%86%A0%EC%96%91-%EC%95%94%EB%B0%98%20%ED%98%BC%ED%95%A9%20%EA%B2%BD%EC%82%AC%EB%A9%B4%20%EC%95%88%EC%A0%95%EC%84%B1%20%ED%8F%89%EA%B0%80.png)
2024 CMS ANNUAL CONFERENCES / 3-6 June,
Comprehensive Simulation and Assessment of Swelling Behavior in Korean Bentonite Buffer Blocks Across Diverse Initial Dry Density Conditions
Gyu-Hyun Go
Research objective
This research employs numerical analysis within COMSOL Multiphysics to evaluate the swelling characteristics of Korean compacted bentonite buffer block. Utilizing a nonlinear elasticity model, the study simulates swelling pressure experiments and validates the outcomes against actual measurements. The analysis incorporates isotropic constraints and water injection pressure to replicate experimental conditions accurately. The model effectively could simulate swelling deformations during saturation, establishing a correlation between higher dry density and increased swelling pressure.
link to full poster