An investigation in squeezing potential in the second segment of Azad tunnel

Document Type : Original Article

Authors

1 M.Sc In Engineering Geology

2 Mashhad Univ. Geology Department

3 Mashhad Ghods Consulting Engineering

Abstract

Quick estimation of possible problems is very important for tunnel excavation through anisotropic and low strength rock masses like shale and schist. This paper deals with the squeezing problem in the second segment of Azad tunnel in KordestanProvince which passes through phyllite and slate weak rock masses with squeezing potential. For this purpose four experimental methods were used. According to the obtained results, squeezing value and strain of tunnel wall in the critical section with maximum overburden (760 m) was determined and then support pressure has been calculated by using Hoek & Marinos equation. At final, the results of above experimental methods has been used for estimating of starting squeezing depth nomination in this segment of tunnel, and this depth has been estimated 180 m.

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References

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Scientific Quarterly Journal of Iranian Association of Engineering Geology
Volume 1, Number 3 & 4
March 2008
Pages 15-24

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History

  • Receive Date: 28 November 2007
  • Revise Date: 19 March 2008
  • Accept Date: 21 January 2009

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