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2013, 7(1): 1707-1724 Back to browse issues page
Estimation of required thrust for tunnel excavation using 3D numerical modeling- Beheshtabad water transmission tunnel as a Case Study
H Sadeghi, S Mahdevari *1
1- , smahdevari@cc.it.ac.ir
Abstract:   (4865 Views)
One of the major challenges in tunneling is the excavation in regions with high potential of squeezing and in the case of application of full face boring machines evaluation of the required thrust in these regions is inevitable. The Beheshtabad water conveyance tunnel with 65 km in length is considered for transferring one billion cubic meter of water annually to the central part of Iran.  According to geological investigation there is a high potential of squeezing in the 19th section of tunnel. In this article, the thrust evaluation methods are investigated and the required penetration force is calculated. Then the numerical procedure applicable to thrust evaluation in the 19th section is discussed and the results are analyzed.  In addition, the required thrust to overcome shield skin frictional resistance using Ramoni's method (2010) is computed and the outputs are compared to numerical ones. As a result of numerical simulation, in order to utilize double shield TBM for the sections of 29030-31600 km and 34900-37490 km, it is required to overcut 3 cm for the favorable geomechanical locations and 10 cm for the unfavorable geomechanical conditions. Decision on the application of full face boring machines in the section of 31600-34900 km could be made providing long term parameters of host rock were determined via performing additional in situ tests in the exploration gallery.  
Keywords: Keyword Beheshtabad tunnel, Squeezing, Thrust, Mechanized excavation, Numerical modeling
Full-Text [PDF 429 kb]   (1464 Downloads)    
Type of Study: s | Subject: En. Geology
Accepted: 2016/10/5 | Published: 2016/10/5
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Sadeghi H, Mahdevari S. Estimation of required thrust for tunnel excavation using 3D numerical modeling- Beheshtabad water transmission tunnel as a Case Study. Journal of Engineering Geology. 2013; 7 (1) :1707-1724
URL: http://jeg.khu.ac.ir/article-1-386-en.html


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Volume 7, Issue 1 (8-2013) Back to browse issues page
نشریه زمین شناسی مهندسی Journal of Engineering Geology
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