Research and application of roof anomaly prediction

Based on the long-term mining time of Jining No. 2 Coal Mine, a set of advanced judgment method for roof anomaly was proposed. This method no longer uses a single value as the critical value of the roof abscission, but calculates the normal reference value and abnormal reference value of the roof motion velocity in different regions. On this basis, the abnormal observation value of the roof is divided into single point and regional In this case, according to the development and change law of the abnormal approach value of the roof, different levels of treatment measures such as normal observation, enhanced observation, and reinforced support are determined. The practical application of Jining No. 2 Coal Mine proves that this method can be used to predict roof abnormalities 15 to 30 days in advance, which buys time for proactive measures to strengthen support.