Considering Creep Parameters of Rock Mass to Evaluate the Necessity Thrust for Excavation in Squeezi

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Considering Creep Parameters of Rock Mass to Evaluate the Necessity Thrust for Excavation in Squeezing Ground

Original Article, D56
Mahdevari S, Bagherpour R.
J. Civil Eng. Urban. 4(4): 370-377. 2014

ABSTRACT: There are a lot of complex problems involving a number of conflicting factors when planning a TBM drive in a squeezing ground. In this respect, numerical analyses represent a helpful decision aid. In this research, Beheshtabad water conveyance tunnel is introduced. Then, the geomechanical rock mass characteristics including time dependent parameters are determined for the 19th zone of Beheshtabad tunnel. Afterwards, the approaches to thrust evaluation and mitigation measures for thrust reduction are reviewed. Then the numerical simulation layout and the achieved results are investigated. According to these results, double and single shield Tunnel Boring Machines (TBM) might be utilized if 55 mm and 20 mm of over-boring in radius could be performed in the A&B and C geological units, respectively. Furthermore, over-boring quantity and shield length affect necessity thrust for excavation more than advance rate and the effectiveness of advance rate increment as a mitigation measure to thrust reduction is decreased by increasing the advance rate.
Keywords: Beheshtabad tunnel, Creep, TBM, Thrust, 3D numerical simulation

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