# Failure Mode Analysis and Dynamic Response of a Coal Mine Refuge Chamber with a Gas Explosion
## 1 Introduction
Even some refuge chamber doors were blasted away. It can be seen that antiknock performance of these refuge chambers actually did not meet safety requirements. One of the key reasons is that there is a large gap between refuge chamber numerical simulation and an actual refuge chamber in a gas explosion. In-depth research on the impact dynamic theory of gas explosion source, air and refuge chamber, the mutual interaction simulations within the mine tunnel space also been found to be deficient. It is pointed out that, in many cases, the explosive loading is simplified into the equivalent triangle wave loading in a finite element simulation [12]. The problems of this method are a too idealized treatment for explosive loading and ignoring the complicated fluid structure interaction between the gas explosion shockwave and the structure of the refuge chamber. In fact, the problems of expansion reflection and diffraction caused by the air blast wave cannot be neglected. The existing simplified equivalent triangle calculation method fails to consider the influence of these factors. In fact, it is necessary to study the flow field distribution around the cabin, which can affect the propagation of the shockwave in the mine tunnel [18]. Research shows that [19] the obstacles in the tunnel have an incentive effect on the propagation of the shockwave and aggravate the damage of the shockwave during the gas explosion. Therefore, obstacles in the tunnel should be reduced as far as possible. The damage extent of an explosion accident can be affected by development and change the characteristics of the flame and explosion shockwave in the process of explosion propagation. It is very significant to study the propagation law of a gas explosion shockwave in the underground tunnel. It is generally known that a gas explosion shockwave has very strong destruction effects on the refuge chamber structure. Once the structure is destroyed or severely deformed, the miners inside the refuge chamber may directly suffer the risk of repeat shockwaves, and it may result in a lot of toxic gas entering the cabin so that the refuge chamber will be invalid. Therefore, the refuge chamber must have a certain anti-explosion performance. At present, most research is focused on the safety of the cabin in an elastic state during a gas explosion. There are few deeper studies about cabin deformation failure modes and mechanisms. In this paper, based on the previous work, the underground mine tunnel model and the refuge chamber model were established using the finite element software ANSYS/LS-DYNA (LSTC, R7.0.0, Livermore, CA, USA, 2014). The propagation of methane/air mixture blast waves and the fluid-structure interactions were simulated by the Arbitrary Lagrange-Euler (ALE) method. The failure mode of the refuge chamber under the action of a strong shockwave was mainly focused and the deformation tendency of the key parts is obtained, which will provide a reliable reference for strengthening the antiknock performance of the refuge chamber in an actual complex explosive environment.