Abstract

During the past decade, gas explosions have been one of the most serious types of disasters in China, threatening the lives of miners and causing significant losses in terms of national property. This article, by constructing the fuzzy fault tree model of gas explosion on the coalface and heading face, deduces the minimum cut sets and minimum path of the fault tree, analyzes the importance of the fault tree structure, and obtains the ratio of gas explosion. The results show that the isolation of gas and heat sources is the most effective way to prevent gas explosion. In addition, a close detection of gas concentration and appropriate treatment can also avoid explosive accidents by reducing the ratio of explosion to below 0.059%, which is the critical value of explosion. The probability of gas explosion occurred in coal working face is about 0%–2.055%, and the most likely probability is 0.059%. However, the probability of gas explosion occurred in heading face is about 0%–8.543%, and the most probability likely to occur is 0.772% which is larger than that in coal working face. The fuzzy fault tree can not only be applied in the analysis of the coal mining gas explosion, but it also provides the theoretical basis for the precaution and prevention of coal mining accidents.

Highlights

  • In 1962, fault tree analysis (FTA) has been extensively employed as a powerful technique in risk analysis studies at Bell Telephone Laboratories in the United States.[1]

  • Despite many publications on FTA, few studies have been devoted to the fuzzy fault tree analysis (FFTA) technique for underground coal mine methane explosion

  • There are eight sets of fault tree with minimum path sets, which show that there are eight ways to prevent from gas explosion in coal face

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Summary

Introduction

In 1962, fault tree analysis (FTA) has been extensively employed as a powerful technique in risk analysis studies at Bell Telephone Laboratories in the United States.[1]. Despite many publications on FTA, few studies have been devoted to the fuzzy fault tree analysis (FFTA) technique for underground coal mine methane explosion. In this study the fault tree of coal working face and heading face was used to analyze the influential factors and processes of coal mine gas explosion. The probability of coal working face and heading face gas explosion disaster was obtained via the theory and method of fuzzy mathematics to help decision makers determine where and whether to take preventive action on methane explosions in the safety management process of underground coal mines. The calculation formula of fault tree and gate is Representation method of fuzzy number 3s. In this method, s represents the standard deviation of all probability values of the expert decision group.

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