Geomechanics and Engineering

  • 제36권1호
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  • Pages.83-97
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  • 2024
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Prediction of the long-term deformation of high rockfill geostructures using a hybrid back-analysis method

  • Ming Xu (Department of Civil Engineering, Tsinghua University) ;
  • Dehai Jin (Department of Civil Engineering, Tsinghua University)
  • 투고 : 2023.03.09
  • 심사 : 2023.12.05
  • 발행 : 2024.01.10
⟨ 이전 논문 다음 논문 ⟩

초록

It is important to make reasonable prediction about the long-term deformation of high rockfill geostructures. However, the deformation is usually underestimated using the rockfill parameters obtained from laboratory tests due to different size effects, which make it necessary to identify parameters from in-situ monitoring data. This paper proposes a novel hybrid back-analysis method with a modified objective function defined for the time-dependent back-analysis problem. The method consists of two stages. In the first stage, an improved weighted average method is proposed to quickly narrow the search region; while in the second stage, an adaptive response surface method is proposed to iteratively search for the satisfactory solution, with a technique that can adaptively consider the translation, contraction or expansion of the exploration region. The accuracy and computational efficiency of the proposed hybrid back-analysis method is demonstrated by back-analyzing the long-term deformation of two high embankments constructed for airport runways, with the rockfills being modeled by a rheological model considering the influence of stress states on the creep behavior.

키워드

과제정보

The authors are grateful for the research support received from the National Natural Science Foundation of China (51978382) and the China 973 Program (2014CB047003).

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