土中爆炸作用下箱涵动力响应的数值分析

he dynamic response of box culvert subjected to subsurface blast loading is related to propagation of shock wave in soil and interaction between soil and structures, and the converge difficult brought by large deformation is always a difficult problem in numerical analysis. A fully coupled numerical analysis technology is used to simulate the response of a large-scale box culvert under blasting load, in which SPH method is adopted to model the near field medium, while FEM is used to model the far field soil and reinforced concrete box culvert. The results show: The damage position and degree is closely related to charge relative position to box culvert. There is a obviously difference among stress and deformation of box culvert under different detonation. Especially at the center position of wall, there is a obviously effect of soil flow on reload and change of stress under different detonation. The final conclusion show that coupled SPH-FE analysis technology can satisfy calculation efficiency and engineering requirements.