Research on Influence Law of Explosion Load on New Subway Cross-structure

Abstract In order to reveal the influence law of explosion load when new subway under-crossing existing subway, the research with the method of combining theoretical calculation and numerical simulation was developed. With theoretical calculation method, the reasonable structural parameters and material parameters were chose, then the equivalent static load of under-crossing structure was obtained at the condition of explosion wave. By using the ANASYS/LS-DYNA software, the propagation law of explosion wave and the load change law of structure were simulated in four different models. Through comparison analysis, it showed the theoretical calculation method and numerical simulation method were rational, and the influence that existing subway on new under-crossing subway was only about the explosion wave propagation velocity except the explosion wave form and amplitude value, and the influence that new under-crossing subway on existing subway about explosion wave was very small. It provided a theoretical basis for design and construction for new under-crossing subway.