Computers and Concrete

  • 제20권4호
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  • Pages.429-437
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  • 2017
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  • 1598-8198(pISSN)
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  • 1598-818X(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Investigation of ratio of TBM disc spacing to penetration depth in rocks with different tensile strengths using PFC2D

  • Sarfarazi, Vahab (Department of Mining Engineering, Hamedan University of Technology) ;
  • Haeri, Hadi (Young Researchers and Elite Club, Bafgh Branch, Islamic Azad University) ;
  • Shemirani, Alireza Bagher (Department of Civil Engineering, Sadra Institute of Higher Education) ;
  • Hedayat, Ahmadreza (Department of Civil and Environmental Engineering, Colorado School of Mines) ;
  • Hosseini, Seyed Shahin (Department of Civil Engineering, Aria University of Sciences and Sustainability)
  • 투고 : 2016.05.21
  • 심사 : 2017.05.17
  • 발행 : 2017.10.25
⟨ 이전 논문 다음 논문 ⟩

초록

In this study, the effect of the tensile strength and ratio of disc spacing to penetration depth on the efficiency of tunnel boring machine (TBM) is investigated using Particle flow code (PFC) in two dimensions. Models with dimensions of $150{\times}70mm$ made of rocks with four different tensile strength values of 5 MPa, 10 MPa, 15 MPa and 20 MPa were separately analyzed and two "U" shape cutters with width of 10 mm were penetrated into the rock model by velocity rate of 0.1 mm/s. The spacing between cutters was also varied in this study. Failure patterns for 5 different penetration depths of 3 mm, 4 mm, 5 mm, 6 mm, and 7 mm were registered. Totally 100 indentation test were performed to study the optimal tool-rock interaction. An equation relating mechanical rock properties with geometric characteristics for the optimal TBM performance is proposed. The results of numerical simulations show that the effective rock-cutting condition corresponding to the minimum specific energy can be estimated by an optimized disc spacing to penetration depth, which, in fact, is found to be proportional to the rock's tensile strength.

키워드

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피인용 문헌

  1. Numerical and Experimental Studies on the Effects of the TBM Cutter Profile on Rock Cutting vol.26, pp.1, 2017, https://doi.org/10.1007/s12205-021-2111-5