Blast-resistant Analysis for a Tunnel Passing Beneath Taipei Shongsan Airport–a Parametric Study

Abstract

This paper covers the blast-resistant analysis for a tunnel passing beneath Taipei Shongsan airport. It briefly discusses the overall analysis process to obtain the maximum lining thrust caused by a bomb explosion for use in the structural lining design. Because there have not been any established common standards or practices governing the design of such a structure, a series of parametric studies have been carried out in order to evaluate the significance and sensitivity of several parameters on the lining thrust. The parameters evaluated are: intensity of blast loading, size of crater, dynamic undrained shear strength, dynamic Young's modulus, and soil-damping ratio. It was concluded that a designer should adopt dynamic soil parameters, obtained from good ground investigation and soil testing, as favorable dynamic soil properties can result in a more economical analysis. For parameters (e.g. bomb type) that are beyond the control of the designer, an additional protective layer over the tunnel structure may be considered in order to minimize the impact of the explosion, instead of designing a more costly rigid structure.

Numerical analysis of internal blast effects on underground tunnel in soils

“…It can be expected that the lining stresses would be increased with an increase in the weight of explosive, and this has been verified by a number of researchers (Gui & Chien, 2006;Liu, 2009). Considering the potential risk of terrorist attack on the subway system, uncertainty does exist in the determination of the location of charge.…”

“…The subjects of these previous studies are both underground structures in rock mass, which are more resistant to internal blast loading than underground structures in soils (Liu, 2009). Lu, Wang, and Chong (2005) and Gui and Chien (2006), using FEM, analyse the blast Downloaded by [McMaster University] at 00:54 30 September 2015 which is very efficient to follow moving boundary. However, Lagrange algorithm would terminate if there is mesh distortion, that is, it cannot be used in large deformation problems such as structures subjected to blast or shock load.…”

Uncertainty Modelling and Limit State Reliability of Tunnel Supports Under Seismic Effects

“…The case study chosen concerns a tunnel of 6 m diameter and overburden depth between 21.0 and 25.3 m [11].…”

Dynamic Analysis of Twin Tunnel Subjected to Internal Blast Loading

“…Coupled fluid-solid interaction was considered in their study, however, the nonlinearity and failure behavior of rock and concrete as well as the interaction between different solid media were not simulated. Lu [21], Gui and Chien [13] and Liu [20] used finite element (FE) procedure to perform blast analysis of tunnels in soil subjected to external blast loading and reported stresses and deformation in tunnel. However, they did not consider high strain rate behavior of soil.…”