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Paper Information

Journal:   AMIRKABIR   FALL 2007- WINTER 2008 , Volume 18 , Number 67-C; Page(s) 9 To 18.
 
Paper: 

EVALUATE OF LOAD ON TBM SHIELD AND SEGMENTS USING CONTINUUM-DISCOUNTINUM 3D NUMERICAL MODELING

 
 
Author(s):  SHARIFZADEH MOSTAFA, TORABI MASOUMI A.
 
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Abstract: 

Calculation of loads on TBM (Tunnel Boring Machine) shield is extremely important in TBM type selection and estimation of support system. Two main ground loading components on TBM consist of loading on TBM cutter head from the tunnel face and loading on the TBM shield from the tunnel surrounding rock mass. In weak rock masses, where convergence rate is high or TBM maintenance take long time, the ground convergence fills the gap between shield and surrounding rocks, which leads to TBM jamming or stoppage. Thus, TBM needs to overcome two forces excreted from ground. In this research, loads on TBM and tunnel lining segments are evaluated using three-dimensional continuum - discontinuum numerical analysis in Ghomrod tunnel. It is founded that; at first, continuum analysis results are different from discontinuum ones, which is due to heavily jointed rock masses condition. Secondly, calculated tunnel convergence with new information is higher than predicted convergence using preliminary data from geotechnical investigation (before tunnel excavation). Several records of TBM jamming confirm these results. Finally, load on tunnel lining cause to segments instability. Evident such as cracks on installed lining segments at tunnel walls verify the numerical analysis results.

 
Keyword(s): TBM, TUNNEL CONVERGENCE, CONTINUUM-DISCONTINUUM ANALYSIS, NUMERICAL MODE LING, LOAD ON SUPPORT
 
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