The Dynamic Response Of Curve Wall Loess Tunnel Under Explosion Action

With the rapid development of China economy and the Western development strategy continuously deepened, tunnels are widely applied in the western loess areas, for example railway and road tunnels, large underground pipelines and different underground caverns. These projects is not only subjected to the static load, but also bore accident or artificial explosion impact action.In recent years, terrorist attacks have often occurred, and caused the collapse and damage of many buildings and constructures (for example urban subways, underground tunnels and buried pipelines etc), and caused tremendous loss of human life and property, even produced inevitably impact influence on people's psychology. Therefore, the study on response and explosion-proof technology for these structures under the explosion action and impact action have been more and more concerned.According to the above conditions, by establishing finite element integral model of loess tunnel dynamic analysis, and comprehensively considering the solving method of nonlinear dynamic equation, and the selection of different material models, and the method of explosion shock wave input, the convergence and realizing factors of fluid-solid coupling effect, the numerical simulation for loess tunnels is realized by the explicit dynamic finite element program ANSYS/LS-DYNA, the curves of time-history includes displacement, speed, acceleration, press and strain are discussed. Furthermore, the dynamic response of loess tunnels under the explosion shock load is analyzed and studied systematically. Therefore, the mechanics laws and weak parts of loess tunnels, and the most likely failure of elements and nodes under the explosion shock action are obtained. So the reference foundation for antiknock design of tunnels, subways and large hinge projects are presented.