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Research Article

Numerical Simulation of Tunnel Collapse due to Explosions Using ANSYS Autodyn

ANSYS Autodyn을 활용한 폭발로 인한 터널 붕괴 시뮬레이션

Young Hak Lee1
,
Dae-Jin Kim1*
이 영학1
,
김 대진1*
1Professor, Department of Architectural Engineering, Kyung Hee University, Yongin, 17014, Rep. of Korea
1경희대학교 건축공학과 교수
*Corresponding Author
30 November 2024. pp. 30-37
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Abstract

This study utilizes ANSYS Autodyn, a widely used and well-validated commercial hydrocode, to investigate the effects of various geometrical and material parameters on tunnel collapse resulting from explosions. The numerical model features a tunnel portal slope composed of rock and a half-circular tunnel with vertical walls. To simulate an infinite domain, transmit and roller boundary conditions are applied at the boundaries of the analysis domain. The mechanical properties of the rock are modeled using the RHT concrete model, while the JWL equation of state is employed to accurately represent TNT. Key parameters analyzed include the strength of the rock, the mass of TNT, and its location. The results indicate that the mass of collapsed rock increases with greater TNT mass or decreased rock strength. Additionally, the location of the TNT has a significant impact on the extent of collapse when placed near the tunnel entrance, with its influence diminishing as the distance from the entrance increases.

Keywords
ANSYS Autodyn
RHT concrete material model
tunnel collapse
explosion
erosion

본 연구는 폭발로 인한 터널 붕괴에 미치는 다양한 기하학적 및 재료적 파라메터의 영향을 조사하기 위해 널리 사용되고 신뢰성이 검증된 상용 유체코드인 ANSYS Autodyn을 사용하였다. 수치 모델은 암석으로 이루어진 터널 포털 경사면과 수직 벽을 가진 반원형 터널로 해석 영역을 정의하였다. 영역의 무한한 크기를 시뮬레이션하기 위해 경계에 전송 및 롤러 경계 조건을 적용하였다. 암석의 기계적 특성은 RHT 콘크리트 모델을 사용하여 모델링하였으며, TNT를 정확하게 표현하기 위해 JWL 상태 방정식을 활용하였다. 분석된 주요 파라메터로 암석의 강도, TNT의 질량 및 위치가 포함되었다. 결과는 붕괴된 암반량이 TNT의 질량 증가나 암석 강도의 감소에 따라 증가함을 나타내었다. 또한, TNT가 터널 입구 근처에 배치되었을 때 그 위치가 붕괴된 암반량에 상당한 영향을 미치며, 입구로부터 거리가 멀어질수록 그 영향이 감소함을 알 수 있었다.

키워드
ANSYS Autodyn
RHT 콘크리트 재료모델
터널 붕괴
폭발
침식
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Information
  • Publisher :Korea Protective Facility Institute
  • Publisher(Ko) :한국방호시설학회
  • Journal Title :Protective Facility
  • Journal Title(Ko) :방호시설
  • Volume : 1
  • No :1
  • Pages :30-37
  • Received Date : 2024-11-05
  • Accepted Date : 2024-11-12
  • DOI :https://doi.org/10.23310/PF.2024.1.1.030
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