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http://dx.doi.org/10.12989/acd.2020.5.4.417

Numerical modelling of internal blast loading on a rock tunnel  

Zaid, Mohammad (Department of Civil Engineering, ZHCET, Aligarh Muslim University)
Sadique, Md. Rehan (Department of Civil Engineering, ZHCET, Aligarh Muslim University)
Publication Information
Advances in Computational Design / v.5, no.4, 2020 , pp. 417-443 More about this Journal
Abstract
Tunnels have been an integral part of human civilization. Due to complexity in its design and structure, the stability of underground structures under extreme loading conditions has utmost importance. Increased terrorism and geo-political conflicts have forced the engineers and researchers to study the response of underground structures, especially tunnels under blast loading. The present study has been carried out to seek the response of tunnel structures under blast load using the finite element technique. The tunnel has been considered in quartzite rock of northern India. The Mohr-Coulomb constitutive model has been adopted for the elastoplastic behaviour of rock. The rock model surrounding the tunnel has dimensions of 30 m x 30 m x 35 m. Both unlined and lined (concrete) tunnel has been studied. Concrete Damage Plasticity model has been considered for the concrete lining. Four different parameters (i.e., tunnel diameter, liners thickness, overburden depth and mass of explosive) have been varied to observe the behaviour under different condition. To carry out blast analysis, Coupled-Eulerian-Lagrangian (CEL) modelling has been adopted for modelling of TNT (Trinitrotoluene) and enclosed air. JWL (Jones-Wilkins-Lee) model has been considered for TNT explosive modelling. The paper concludes that deformations in lined tunnels follow a logarithmic pattern while in unlined tunnels an exponential pattern has been observed. The stability of the tunnel has increased with an increase in overburden depth in both lined and unlined tunnels. Furthermore, the tunnel lining thickness also has a significant effect on the stability of the tunnel, but in smaller diameter tunnel, the increase in tunnel lining thickness has not much significance. The deformations in the rock tunnel have been decreased with an increase in the diameter of the tunnel.
Keywords
blast load; Coupled-Eulerian-Lagrangian; rock tunnel; concrete liners; Jones-Wilkins-Lee;
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Times Cited By KSCI : 20  (Citation Analysis)
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