Improvement and application of mine shaft safety evaluation system

In order to furtherly improve the evaluation system of the mine shaft, based on the mine main shaft, mine auxiliary shaft, east ventilation shaft and west ve ntilation shaft in Xinglongzhuang Mine as the examples, the improved experiment fitting method and the multi statistic distance judgement method were applied to evaluate the stability conditions of the four mine shafts on December,2015. The results showed that based on the water table dropping and the strata compression value as t he evaluation factors, the west ventilation shaft had a possibility of cracking, the stability of the mine main shaft had an uncertainty and the mine auxiliary shaft and the e ast ventilation shaft had a small possibility of the cracking. In order to furtherly determine the stability of the mine main shaft and to increase the accuracy of the evaluat ion, there were eight main factors affected to the stability of the mine shaft liner taken as the judgement factors. There were 11 selected known results of Xinglongzhuan g Mine samples applied to establish a mathematic model. The min distance judgement method was applied to the further evaluation of the predicted samples. The possi bility of the cracking on the mine main shaft was found on December,2015. The danger degree of the four mine shaft broken was in a sequence from large to small and they were the west ventilation shaft, mine main shaft, auxiliary shaft, east ventilation shaft.