Stability assessment of dual circular tunnels with different diameters along hoek-brown rock masses
Stability assessment of dual circular tunnels with different diameters along hoek-brown rock masses
This paper presents the stability of dual circular shaped tunnels with different diameters in rock masses under surcharge loading on the ground surface using Finite Element Limit Analysis (FELA). The length of the tunnel laid in the rock media is assumed to be enormously large as compared to its lateral dimensions such that the plane strain condition prevails for the current study. The rock mass is modeled as perfectly plastic material obeying the associated flow rule and governed by the non-linear Hoek-Brown failure criterion. In addition, the rock media is assumed to be homogenous and isotropic. For the current studied problem, the maximum value of the surcharge load is estimated for different values of overburden ratio using lower bound FELA. The obtained results are presented in the form of stability charts taking into consideration of different dimensionless parameters. Moreover, the results have been duly validated from the literature for circular tunnels with equal diameters in the rock mass.
Spandan Sahu; G. Tiwari; Jagdish Prasad Sahoo
10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)
10. Tunnelling and mining applications
https://doi.org/10.53243/NUMGE2023-417
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