Indirect coupling method for structural analysis of refuge chamber

Lei Wang,Hang Ding,Cai Fu,Liangwen Fang,Yanting Wang,Jiwei Zhang,Zhaoyang Song,Song Zhang

doi:10.21595/jve.2020.21247

Lei Wang, Hang Ding + Show 6 more

Open Access

https://doi.org/10.21595/jve.2020.21247

Copy DOI

Abstract

Structural analysis is important in the design of a refuge chamber, which can ensure the structural safety of the refuge chamber in case of an explosion. In this paper, an indirect coupling method is utilized to calculate deformation of a refuge chamber under explosion, when gas explosion is simulated in a roadway model, and the pressure waves on different locations of chamber are extracted. The extracted pressure-time curves are applied to a detailed model of the refuge chamber to obtain deformation values. However, reliabilities and validities of the simulation results are not provided. Thereby, we conducted three groups of small-scale physical experiments for comparing the corresponding simulation results calculated by the indirect coupling method. Meanwhile, the theoretical values were obtained by the method of extracting the specific impulse. The results show that the simulation values fit well with the experimental and theoretical values. The process of applying a pressure-time curve to the model covers the specific impulse which acts on the prototype. This method can be used to calculate the deformation of complex equipment under explosion.

Highlights

Refuge chamber is lifesaving equipment for underground coal mines that bear the explosion shock wave and high-temperature environment for a certain time
1) An indirect coupling simulation method is utilized for analyzing the structure strength of a refuge chamber
An explosion is simulated in a roadway model, where the pressure-time curves on a simplified refuge chamber model are extracted and applied to a detailed model, which has the same materials and properties as the prototype chamber

Summary

Introduction

Refuge chamber is lifesaving equipment for underground coal mines that bear the explosion shock wave and high-temperature environment for a certain time. It is placed near the coal working face and can provide approximately 96 hours of breathable air, water, food, and supplies in an urgent event in which miners are unable to escape [1, 2]. It is very important for the refuge chamber to keep stable and safe performances under serious explosion accidents. In China, the front of the refuge chamber should resist at least 0.6 MPa within 300 ms [6]

Methods

Results

Conclusion