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Through the theoretically analyzing of the foundation of outburst prediction indexes and the existing prediction data of coal mine, a mathematics model was established with the dimension theories by considering with weights of dominant factors for ascertaining sensitive factors of coal seam. The established model and grey relevancy analysis were successfully verified in four coal mine of Pingdingshan...
There are many uncertainties which have the characteristics of high investment and high risk in coal-bed methane underbalanced drilling. If the potential risk and its state can be predicted in advance, the probability of risk occurrence will be reduced to the minimum extend. On the basis of risk identification of coal-bed methane underbalanced drilling, it concludes that the drilling risks mainly...
In order to reduce dust concentration and prevent gas accumulation in the underground of coal mine, coal seam water infusion and gas drainage are fundamental measures. Present hole sealing methods are just for one purpose, which makes both too many holes quantities and waste of sealing materials. A new hole packer of center-through rubber self-expandable hole packer by water pressure was developed...
Based on systematic collection of the hydrogeological data of coal mine, we analyzed the factors affecting water inrush from coal floor and determined the major factors. We used the fuzzy clustering method to evaluate the water inrush risk from coal floor in order to solve the evaluating limitation of water inrush risk from coal floor by the water inrush coefficient method. The fuzzy clustering method...
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