Two numerical approaches of shock tube test : discrete model of PFC3D and continuous model of Abaqus

A shock tube experimental test is established to perform the simulation of soil ashlar belonging to shallow tunnel subjected to shock blast wave. In this work of thesis, a simple continuous numerical model of this shock tube is created using Abaqus, which consists of axial-symmetric soil specimen (1.42m long, 29.15m wide) and analytical rigid chamber (without thickness). Four kinds of material are considered: Elastic model, Porous elastic model, Drucker-Prager linear model, Drucker-Prager cap model. The sand-steel chamber’s friction influence is studied in detail both in static and dynamic conditions. The behaviors of the 4 materials are investigated in several cyclic static load conditions. The effects of friction and plasticity are analyzed within the results of Abaqus models. In another approach, a discrete numerical model of shock tube is created using PFC3D, which consists of rigid cylinder wall without thickness and large amounts of balls full filled inside walls. The model has 1.42m length and 29.15mm inter-radius. Four impulse waves of experimental tests are applied on the model. Furthermore, the results of these two models under the experimental impulse loads are analyzed and compared, to discuss the difference between these two approached.