Abstract
In order to evaluate the stability of deep surrounding rock, all of the affecting factors should be theoretically identified. However, some factors have slight impacts on the stability of deep surrounding rock compared with others. To conduct an effective risk assessment, key factors should be first extracted. The analytic hierarchy process (AHP) and grey relation analysis (GRA) methods are integrated to determine the key factors. First, the AHP method is applied to sort the factors by calculating the weights of them. Seven out of fifteen factors are extracted as the key factors, which account for 80% of the weights. Further, the GCA method is used to validate the effects of these key factors by analyzing the correlation between the performance of each factor and that of the reference. Considering the influence of these key factors and experts’ judgements, the multilevel fuzzy comprehensive evaluation method is adopted to obtain the risk level of the deep surrounding rock stability. Finally, the risk assessment of the deep surrounding rock in the E-Zhuang coal mine of Chinese Xinwen Mining Area illustrates the operability of the proposed method.
Highlights
The geological environment of coal mine is complex and its ecological environment is fragile
Once the whole rock mass is destroyed, the instability of the surrounding rock could lead to a series of environmental disasters, such as collapse and roof separation, which result in great harm to the geological environment
The particular environment of the mine and these disasters indicate that the stability of the deep surrounding rock of the coal roadway is an urgent problem for safe mining
Summary
The geological environment of coal mine is complex and its ecological environment is fragile. The particular environment of the mine and these disasters indicate that the stability of the deep surrounding rock of the coal roadway is an urgent problem for safe mining. It is of great significance to evaluate the stability of deep surrounding rock, which is related to the safety of people’s lives and property, and to an urgent problem of safety in mining and environmental protection. Res. Public Health 2019, 16, 2802 disasters have indicated that the stability of the deep surrounding rock in the coal roadway is an urgent problem for safe mining. The stability of the deep surrounding rock is affected by geological features, but environmental factors and engineering factors. The novelty of this paper is to identify and verify the key factors of the deep surrounding rock stability and to establish a model for a comprehensive risk assessment.
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