Earth pressures acting on vertical circular shafts considering arching effects in c-${\phi}$ soils: I. Theory

c-${\phi}$ 지반에서의 아칭현상을 고려한 원형수직터널 토압: I. 이론

  • 김도훈 (고려대학교 건축사회환경공학부) ;
  • 이대수 (한국전력공사 전력연구원) ;
  • 김경렬 (한국전력공사 전력연구원) ;
  • 이용희 (한국전력공사 전력연구원) ;
  • 이인모 (고려대학교 건축사회환경공학부)
  • Published : 2009.06.30

Abstract

Several researches have been done to estimate the earth pressure on a vertical circular shaft considering three dimensional arching effect and verified them by conducting model tests. However, any equation suggested so far is not applicable in case of multi-layered soils and/or C-${\phi}$ soils. In this study, new equation for estimating the earth pressure acting on the vertical shaft in c-${\phi}$ soils is proposed. A parametric study is performed to investigate the significance of the cohesion when estimating the coefficient of earth pressure in C-${\phi}$ soils and estimating earth pressures in vertical shafts. A method which can estimate the earth pressure on vertical shafts in layered soils is also proposed by assuming a failure surface in layered soils and using the modified equation. This paper is Part I of companion papers focusing on the theoretical aspect of model developments; the experimental verification will be made in Part II.

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