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Study on the influence of closely crossing tunnel on existing underground subway station by 3d-fem models

Sadaghiani, M. H ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1201/9780429424441-650
  3. Publisher: CRC Press/Balkema , 2019
  4. Abstract:
  5. The increase of underground space applications, as a solution for congested urban areas makes it inevitable to cross closely spaced underground structures. The analysis of new TBM EPB-bored tunnel under existing underground station was conducted by 3D finite element method. The influence of new tunneling was investigated on the deformation and moments of final lining of existing underground station. The effectiveness of interaction analysis depends on factors such as station overburden, existing station supporting stiffness and traffic loads. In this paper, a parametric study was conducted to study ground movements and lining moments. It is shown that moment increase is significant when the tunneling face is in the closest distance to existing underground station. The increase of circumferential moment was appeared in sides; therefore, more attention should be paid on station side walls. The comparison of controlling parameters shows that the deeper structures intensify interaction effects on station crown deformation and side walls moments. The effect of station liner stiffness was considered. The results showed that stiffer (i.e., thicker) final lining does not have notable influence on station deformations but it causes significant increase in side walls moment. Lastly, the influence of surface traffic loads has been investigated (i.e. traffic loads of 0, 20 kPa and 40 kPa). The results show that regional stress increase by traffic load should be considered. In conclusion, less overburden loads and traffic live loads reduce interaction unfavorable effects and stiffer station supporting system is not a practical solution to improve response of existing structures. © 2019 Taylor & Francis Group, London
  6. Keywords:
  7. Deformation ; Linings ; Office buildings ; Railroad stations ; Space applications ; Stiffness ; Underground structures ; 3-D finite element method ; Controlling parameters ; Interaction analysis ; Interaction effect ; Practical solutions ; Supporting systems ; Underground stations ; Underground subway stations ; Subway stations
  8. Source: World Tunnel Congress, WTC 2019 and the 45th General Assembly of the International Tunnelling and Underground Space Association, ITA-AITES 2019, 3 May 2019 through 9 May 2019 ; 2019 , Pages 6140-6150 ; 9781138388659 (ISBN)
  9. URL: https://www.taylorfrancis.com/chapters/study-influence-closely-crossing-tunnel-existing-underground-subway-station-3d-fem-models-sadaghiani-asgarpanah/e/10.1201/9780429424441-650