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The effect of formation of spherical underground cavity on ground surface settlement : Numerical analysis using 3D DEM

구형지하공동 형성이 지표침하에 미치는 영향에 대한 3차원 개별요소해석

Sang-Hyun Lee1
,
Hang-Lo Lee1
,
Ki-Il Song2*
이 상현1
,
이 항로1
,
송 기일2*
1Department of Civil Engineering, Inha University, Graduate Student
2Department of Civil Engineering, Inha University, Associate Professor, Corresponding author
1인하대학교 토목공학, 석사과정
2인하대학교 토목공학, 부교수
*교신저자. *Corresponding Author. 
31 March 2016. pp. 129-142
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Abstract

The underground cavity known as one of the reasons of ground surface settlement is a discontinuous character. Therefore, it is limited to analyze with continuum analysis. In this research, The spherical underground cavity affecting the ground surface settlement is studied with Discrete Element Method. Ground properties, depth and diameter of the spherical underground cavity are chosen as factors of the spherical underground cavity and the effect of the each factor variations on the ground surface settlement is analyzed. Relative depth to the diameter of the spherical underground cavity is also studied. The result of the research suggests the basis of underground cavity collapse prediction and standard of support.

Keywords
Discrete element method
Particle flow code
Spherical underground cavity
Ground surface settlement

지표침하를 발생시키는 다양한 원인 중에 하나로 알려진 지하에서 발생되는 공동은 지반의 불연속적 특징이다. 그러므로 기존의 연속체해석으로 분석하기에는 한계가 있을 것으로 판단된다. 본 연구에서는 지표침하를 발생시키는 구형지하공동에 대해서 개별요소법을 활용하여 분석하였다. 지표침하에 영향을 미치는 구형지하공동의 특성인자로서 지반의 물성치, 구형지하공동의 심도 및 크기를 선택하였고, 각 특성인자들의 값의 변화가 지표침하에 미치는 영향에 대해 분석하였다. 또한 지하공동의 직경에 대한 상대적 깊이와 지표침하의 관계를 분석하였고, 이를 통해 지하공동의 붕괴 예측 및 보강유무를 결정하기 위한 근간을 제시하였다.

키워드
개별요소법
입자유동해석
구형지하공동
지표침하
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Information
  • Publisher :Korean Tunneling and Underground Space Association
  • Publisher(Ko) :한국터널지하공간학회
  • Journal Title :Journal of Korean Tunnelling and Underground Space Association
  • Journal Title(Ko) :한국터널지하공간학회 논문집
  • Volume : 18
  • No :2
  • Pages :129-142
  • Received Date : 2016-01-20
  • Revised Date : 2016-03-09
  • Accepted Date : 2016-03-21
  • DOI :https://doi.org/10.9711/KTAJ.2016.18.2.129
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