NUMERICAL SIMULATION OF BLAST WAVE PROPAGATION IN LAYERED SOIL FEATURING SOIL-STRUCTURE INTERACTION

Abstract eng:
In recent decades, the blast load impact on structures has acquired considerable attention due to magnified threats from various man-made activities. Understanding the shock wave propagation in soil and its interaction with structure are crucial in a blast scenario. In a surface or sub-surface blast, the shock wave mechanics and its subsequent impact on underground or above ground structures are extremely complex. This paper scrutinizes the problem of an underground explosion initiated by penetrated missile and thereby focuses on the characteristics of shock wave propagation and pressure attenuation in the surrounding soil. Analyzing empirical data for the same reflects different attenuation factor for different type of soil. Numerical simulations of blast wave propagation in soil and the effect of soil-structure interaction are implemented in a computationally efficient way using an advanced finite element analysis tool (LS-DYNA). Constitutive material models are used to simulate the non-linear behavior and damage profile in concrete and soil. Observations on the numerical model reveal a close tally with theoretical calculations in predicting shock wave characteristics in an undisturbed wave propagation. Numerical analysis is essential to study the exact conditions prevalent during a sub-surface blast. The above mentioned condition has been theoretically tested for a surface blast and results compared to confirm sub-surface blast having much greater impact at a longer distance. An attempt has been made to capture the Transmission and Reflection phenomena related to pressure wave propagation at the interfaces of multi layered media that is actually evident in the case of blast wave passing through layered soil. Preliminary study on wave propagation in rock media highlighting the difference in behavior of the shock waves in soil and rock is presented and discussed as well.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket