Geomechanics and Engineering

  • 제26권3호
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  • Pages.227-234
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  • 2021
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Upper bound limit analysis of blow-out failure mode of excavation face of shield tunnel considering groundwater seepage

  • Huang, Fu (School of Civil Engineering, Changsha University of Science and Technology) ;
  • Wang, Di (School of Civil Engineering, Changsha University of Science and Technology) ;
  • Xiao, Nan (School of Civil Engineering, Changsha University of Science and Technology) ;
  • Ou, Ruo-Chen (School of Civil Engineering, Changsha University of Science and Technology)
  • 투고 : 2020.03.07
  • 심사 : 2021.08.03
  • 발행 : 2021.08.10
⟨ 이전 논문 다음 논문 ⟩

초록

The study of failure mode for the soil in front of a shield tunnel face is a key challenge for tunnel engineering, especially when drilling under the water table. This work aims to study face stability of a shield tunnel under the water table based on an blow-out failure mechanism in the framework of the upper bound theorem of limit analysis in conjunction with variational principle. The seepage force in the seepage field is derived, and seepage force is regarded as an external force which is introduced in the upper bound calculation. Based on the failure characteristic of the blow-out failure for the soil in front of a shield tunnel face, a upper bound failure mechanism is constructed. Using this mechanism, the equation of the failure surface is obtained and the shapes of the failure surfaces for different parameters are plotted. By studying the influence of various parameters on the shape of failure surfaces, the changing laws of the shape of the failure surface for different parameters are obtained.

키워드

과제정보

This study was supported by the National Natural Science Foundation of China (Grants No. 51878074 and 51908067), Natural Science Foundation of Hunan Province, China (Grant No. 2021JJ30714) and Innovation Driven Project of Central South University (No. 2019CX011). Their financial supports are greatly appreciated.

참고문헌

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