The Current Practices of Analysis of Tunnel Structure Under Blast Loading
摘要
Tunnels are critical component of rapid transit system of any country. The present study revisits the state-of-the-art review of the dynamic analysis of tunnels subjected to blast loading. The study focuses on a comprehensive review of existing methodologies, numerical models and experimental approaches employed in assessing response of these structures to blast events. It was observed that due to limitations in field tests for large-scale problems like tunnels, scale modeling techniques like centrifuge modeling are used for experimental studies. Many researchers recommended the explicit dynamic nonlinear finite element approaches as good alternative to experimental studies. The study of literature indicates that the researchers were carried out numerical simulation using well-known generalized finite element methods, i.e., LS-DYNA, Abaqus, Arbitrary Lagrangian Eulerian (ALE) method and smooth particles hydrodynamics (SPH) method. Many researchers adopted Drucker-Prager elasto-plastic model to represent soil, concrete damage model to represent concrete and Johnson–Cook model, plastic kinematic material model to represent steel under blast load effect for most of the numerical simulations. Discussion on various parametric studies to investigate effectiveness of different tunnel lining materials, soil-structure interaction and different charge weights is also made. The study summarizes the various research results and appends present state of knowledge for the tunnel structures exposed to blast loading.