Author(s)

Nabi Nakhaei^*, Mohsen Jami, Homan Najafizade, Farhad Jahani Adimi, Seyed Hossein Mirzeinaly Yazdi, Mohsen Pourkermani, Nazanin Sarhadi

Department of Geology, Zahedan Branch, Islamic Azad University, Zahedan, Iran.

Effect of Explosion on underground structures where drilled on the stony materials can be affected by explosive strength and rock mass properties of tunnel. In this paper, it has been studied on effect of explosion of 10 tons TNT on the round tunnel (diameter: 10 m) in 25 m depth in the mass rocks (RMR > 90) to estimate stability of tunnel to construct underground structure. Regarding to the studied stones, geo-mechanical indices of rock mass have been found to use as strength criteria in UDEC. In the next step, tunnel in real dimensions and founded indices is modeled with UDEC and analyzed stably. Explosion wave indices are found by UFC Instruction and other experimental relations to administer force from explosion wave on the model. Finally, on the base of FISH, indices of explosion wave are administrated in UDEC and tunnel is analyzed dynamically. According to modeling in depth of 25 m, amount of displacement of drilled tunnel in mass rocks (RMR < 90) is very lower than standard criterion and the tunnel is very stable. Development of plastic zone, vertical and horizontal displacement of rock mass around the tunnel, speed variations and stress from explosion wave are modeled and recorded as the graphs and figures.

Underground Structure, Plastic Zone, Round Tunnel, UDEC Software, UFC Instruction

Nakhaei, N. , Jami, M. , Najafizade, H. , Adimi, F. , Yazdi, S. , Pourkermani, M. and Sarhadi, N. (2016) Numerical Modeling of Explosive Loading on Strong Rock Mass with Discontinuity System in Depth 25 m. Open Journal of Geology, 6, 117-130. doi: 10.4236/ojg.2016.63012.