Research on Resistance Characteristics of Fire Zone of Mine Tunnel Fire and Construction of Calculation Model

Author:

Ni Minghao1,Zhao Xiaokun1,Wang Wencai2,Zhang Qiongyue3,Wang Hongwei1,Wang Jianing1

Affiliation:

1. School of Coal Engineering, Shanxi Datong University, Datong 037009, China

2. School of Mining and Coal, Inner Mongolia University of Science and Technology, Baotou 014010, China

3. School of Mechanical and Materials Engineering, North China University of Technology, Beijing 100144, China

Abstract

To investigate resistance change in the fire area of a roadway caused by roadway fires, a mathematical calculation model for thermal resistance is developed. Theoretical research is conducted to analyze the factors influencing resistance change through theoretical derivation, revealing that temperature is a key factor contributing to the change in thermal resistance. By leveraging the correlation between changes in CO concentration and temperature on the downwind side of the roadway within the fire zone, researchers developed mathematical models to predict temperature increases at various points downwind of the fire source. These models were then used to determine the mathematical relationship governing the change in thermal resistance. The accuracy of the numerical simulation software was validated using Fluent numerical simulation software and scaled-down model experiments. Full-scale numerical simulation experiments were conducted to investigate the fire characteristics of roadway fires and validate the thermal resistance mathematical model. The results indicate that the thermal resistance in the numerical simulation is 7.55 Pa at 20m from the fire source and 5.54 Pa at the end of the roadway. The decrease in resistance is linear. The minimum error between the thermal resistance calculated by the mathematical model and the gradient of the pressure drop in the numerical simulation is 0.03 Pa, approximately 2.3%. Furthermore, the fitting degree of the pressure drop in each section is as high as 97.7%. The calculation model demonstrates high accuracy and offers a theoretical foundation for investigating fire resistance in tunnel fire.

Funder

National Natural Science Foundation of China

Publisher

MDPI AG

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