TBM Shield Selection Squeezing Ground, Case Study Part 2 Qomroud Tunel

Document Type : research - paper

Authors

1 MahabGhodss Consulting Engineering Company

2 Shahrood University of Technology

3 Science and Research Branch, Azad University

4 The University of Queensland, QLD 4069, Australia

5 University of New South Wales

Abstract

Qomroud tunnel with the total length of 35.7 kilometers is a part of large project which is under construction for transporting water from the Dez main stream to Qom city. Excavation analysis of the second lot of Qomroud tunnel, with the total length of 6+700 [i1] km, reveals that the occurrence of squeezing phenomenon is very probable in this specific part of tunnel. In order to select the best boring machine that suits the condition of tunneling in the second lot of Qomroud tunnel, this paper investigates the performance and efficiency of single and double shield tunnel boring machines (TBM) from the advance rate point of view and squeezing control parameters. To reach the objectives of the paper, NTH method is considered for estimating the advance rate parameter while tentative, semi tentative and theoretical- analytic methods are taken into account to evaluate the squeezing behavior of different geological features embedded in the tunnel’s length. Moreover, necessary over boring operation in different section of the tunnel is calculated using a numerical finite difference software (FLAC­2D) to overcome the convergence problem of the tunnel due to severe squeezing conditions. Results show that based on the dominant conditions, double-shield boring machine is more reliable and trustful in which it increases the tunneling efficiency and decreases the occurrence of jamming hazard.
 



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Keywords

Journal of Mining Engineering
Volume 7, Issue 17 - Serial Number 17
December 2013
Pages 93-106

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History

  • Receive Date: 09 September 2013
  • Accept Date: 09 September 2013

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