한국지반공학회:학술대회논문집 (Proceedings of the Korean Geotechical Society Conference)
- 한국지반공학회 2008년도 춘계 학술발표회 초청강연 및 논문집
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- Pages.1278-1289
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- 2008
역해석 수법과 현장계측에 의한 비선형 구성법칙 결정에 관한 기초적인 연구
Preliminary Study for Estimation of Nonlinear Constitutive Laws by using Back Analysis and Field Measurement
- 이재호 (경북대학교 토목공학과) ;
- 아쿠타가와 신니치 (일본 고베대학교 토목공학과) ;
- 김영수 (경북대학교 토목공학과) ;
- 사쿠라이 순슈케 (일본 건설공학연구소) ;
- 김광일 (경북대학교 토목공학과) ;
- 김낙영 (한국도로공사, 도로교통기술원)
- Lee, Jae-Ho (Dept. of Civil Engineering, KyungPook National University) ;
- Akutagawa, Shinichi (Dept. of Architecture and Civil Engineering, Kobe University) ;
- Kim, Young-Su (Dept. of Civil Engineering, Kyungpook National University) ;
- Sakurai, Shunsuke (Construction Engineering, Res. inst.) ;
- Jin, Guang-Ri (Dept. of Civil Engineering, Kyungpook National University) ;
- Kim, Nag-Young (Research & Development center, Korea Expressway Corporation)
- 발행 : 2008.03.28
초록
Currently in increasing number of urban tunnels with small overburden are excavated according to the principle of the New Austrian Tunneling Method (NATM). Successful design, construction and maintenance of NATM tunnel in urban area demands prediction, control and monitoring of surface settlement, gradient and ground displacement with high accuracy. Use of measured displacement for parameter determination has been researched over the years, and one geotechnical engineering principle has been formed as back analysis. In this paper, back analysis of a ground deformational behavior involving nonlinear behavior is discussed. It is of primary importance to make reliable prediction of deformational behavior for shallow tunnels in soft ground. However, predictions made often prove to be incorrect due to complexity of constitutive law and other relevant factors. Back analysis therefore becomes more important, for it may be used to interpret measured displacement to derive nonlinear material characteristics. The paper shows some example in which a deformational mechanism is studied in the light of inhomogeneous distrubution of Young's module, from which a logic is derived to identify two different types of nonlinear constitutive relationships.