Assessment of optimal tunnel boring machine (TBM) excavation method by analyzing stability of tunnels in squeezing rock conditions (Case Study: Chamshir Tunnel)

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Sabet Navid; Gharouni Nik Moreteza; Alizadeh Galdiani Milad; Mosayebi Seyed Ali

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Journal Paper

Paper Information

Journal: International Journal of Railway Research Year:2023 | Volume:10 | Issue:2 Page(s): 94-105

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Title

Assessment of optimal tunnel boring machine (TBM) excavation method by analyzing stability of tunnels in squeezing rock conditions (Case Study: Chamshir Tunnel)

Author(s)

Sabet Navid | Gharouni Nik Moreteza | Alizadeh Galdiani Milad | Mosayebi Seyed Ali | Issue Writer Certificate

Keywords

squeezing ground

tunneling

mechanized drilling

Soil Mechanics

TBM

Abstract

The implementation of infrastructure projects in the transportation industry is always considered one of the most expensive projects for the development of countries, and tunnels also account for a significant portion of these costs. One of the important issues in tunneling is the behavior that the earth exhibits in squeezing conditions. In the squeezing ground, the stones move into the tunnel and cause problems in the maintenance and continuation of the tunnel construction. For tunneling in squeezing rock, it is necessary to first know the type of phenomenon and its intensity carefully and then design the required drilling method and maintenance system according to the available information. This article aims to identify the squeezing tunnel and its behavior through numerical analysis and modeling of the Chamshir tunnel. According to the conditions of the mechanized drilling machine, including the instability of the working front, the relative flexibility of the machine in changing the drilling diameter, the supply of force propulsion, and machine extension control, the best mechanized drilling equipment should be selected, and its driving force should be determined in such a way as to prevent the TBM from getting stuck inside the tunnel.

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