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Numerical Analysis of Load Reduction for Underground Arch Structures with Soft Zone Using Expanded PolyStyrene Geofoam

EPS Geofoam을 이용한 Soft Zone 적용방법에 따른 지중아치구조물의 하중저감에 관한 해석 연구

  • Kim, Soo-Ha (Department of Civil Engineering, Sangmyung University) ;
  • Park, Jong-Sup (Department of Civil Engineering, Sangmyung University) ;
  • Kang, Jun-Suk (Department of Landscape Architecture and Rural System Engineering, Seoul National University)
  • 김수하 (상명대학교 건설시스템공학과) ;
  • 박종섭 (상명대학교 건설시스템공학과) ;
  • 강준석 (서울대학교 조경지역시스템공학부)
  • Received : 2018.07.04
  • Accepted : 2018.10.05
  • Published : 2018.10.31

Abstract

As the demand for underground space increases, many researchers have been studying the load reduction method using high compressible materials to solve for the stability problem of the overhead load and for the increase of the earth pressure which decreases the function of the underground structure. This paper determines the optimum soft zone and the effect of the using EPS Geofoam as a load reduction material to arch structures. A finite element analysis program, ABAQUS, is used to analyze the soil-structure interaction and the behavior of buried arch structures considering different four EPS Geofoam forms to confirm the most conservative shape. The optimum cross-sectional shape was determined by comparing the results of earth pressure reduction rate in accordance with the change of span-rise ratio and span length of the arch structure. It was confirmed that the earth pressure generated in the arch structure using the optimal soft zone selected by the numerical analysis was reduced by an average of 78%. In this study, the effect of EPS Geofoam on soil pressure reduction and its applicability to underground arch structures will provide an economical and conservative way to design underground structures and will help to increase the usability of deep underground space.

Keywords

Arch Structure;EPS Geofoam;Reduction of Earth Pressure;Soft Zone;Soil-Structure Interaction

Acknowledgement

Supported by : 국토교통과학기술진흥원

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