Parametric Sensitivity Analysis and Uncertainty Quantification for Cast Iron–Lined Tunnels Embedded in Soil and Rock under Internal Blast Loading

The backbone of any modern urban infrastructure, tunnels are susceptible to terrorist threats. An explosion inside a tunnel may lead to failure of the structure and also substantial socioeconomic losses. In this study, tunnels subjected to internal blast loading have been analyzed using an explicit dynamic finite-element analysis procedure. The tunnel lining is considered to be made of cast iron, which is modeled with a damage criterion incorporating the failure of cast iron. The stress-strain response of soil and rock are simulated using the Drucker-Prager plasticity criterion. The deflection and stresses developed in the tunnel were studied. Parametric sensitivity analyses are performed by varying the peak blast pressure, thickness of tunnel lining, yield strength of soil and rock, angle of internal friction, dilation angle, modulus of elasticity of soil and rock, and yield strength and failure strain of the cast-iron lining. From the results, it is observed that the thickness of tunnel lining, peak blast pressure in the tunnel, and the elastic modulii of soil and rock affect the blast response of tunnels most severely, whereas results are less sensitive to dilation angle of soil and rock. Quantification of parametric uncertainty in tunnel displacement and stress-strain response has been carried out through Monte Carlo simulations, considering normal and uniform distributions of material parameters. It is observed that parametric uncertainty does significantly affect the response of tunnels under blast loading.

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  • English

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  • Accession Number: 01608053
  • Record Type: Publication
  • Files: TRIS, ASCE
  • Created Date: Jun 14 2016 3:03PM