Geomechanics and Engineering

  • 제15권1호
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  • Pages.621-630
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  • 2018
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Catastrophe analysis of active-passive mechanisms for shallow tunnels with settlement

  • Yang, X.L. (School of Civil Engineering, Central South University) ;
  • Wang, H.Y. (School of Civil Engineering, Central South University)
  • 투고 : 2017.04.14
  • 심사 : 2017.11.08
  • 발행 : 2018.05.20
⟨ 이전 논문 다음 논문 ⟩

초록

In the note a comprehensive and optimal passive-active mode for describing the limit failure of circular shallow tunnel with settlement is put forward to predict the catastrophic stability during the geotechnical construction. Since the surrounding soil mass around tunnel roof is not homogeneous, with tools of variation calculus, several different curve functions which depict several failure shapes in different soil layers are obtained using virtual work formulae. By making reference to the simple-form of Power-law failure criteria based on numerous experiments, a numerical procedure with consideration of combination of upper bound theorem and stochastic medium theory is applied to the optimal analysis of shallow-buried tunnel failure. With help of functional catastrophe theory, this work presented a more accurate and optimal failure profile compared with previous work. Lastly the note discusses different effects of parameters in new yield rule and soil mechanical coefficients on failure mechanisms. The scope of failure block becomes smaller with increase of the parameter A and the range of failure soil mass tends to decrease with decrease of unit weight of the soil and tunnel radius, which verifies the geomechanics and practical case in engineering.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation

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피인용 문헌

  1. Upper Bound Analysis of the Stability of 3D Slopes in the Saturated Soft Clay Subjected to Seismic Effect vol.9, pp.None, 2018, https://doi.org/10.3389/feart.2021.795854