Numerical Modeling of Underground Explosion and Response of Buried Structures using Coupled Eulerian-Lagrangian Method

In the present study, underground explosion and its iteraction with buried structures are modeled using Coupled Eulerian-Lagrangian Method (CEL). Modeling of explosive and its surrounding soil with Lagrangian approach is impossible due to large deformations and distortions which occure in soil. In order to develop a comprehensive model, the advantages of the Eulerian and Lagrangian approaches should be combined. The Eulerian approach is used for explosive and its surrounding medium to estimate near-field response such as dimensions of crater; and Lagrangian approach is used for far-field response of the blast such as pressure on buried structures. JWL equation of state is supposed for explosive behavior. Finally, the effect of different parameters of explosive (mass), soil (density, elastic modulus, internal friction angle, and cohesion) and buried structure (geometry and material) on the response of the medium are investigated.