Application of unequal interval grey model in mining subsidence predictio

For problems that mining subsidence prediction by use of gray model was only for one point at present and lacked overall subsidence prediction of working face as well as checkout of prediction accuracy, mining subsidence data was taken as research object which was monitored by surface observation station on strike line and dip line of working face, and interval of adjacent monitoring time was taken as weight to establish an unequal interval grey model for predicting subsidence value of the surface observation station at the next moment, thus subsidence curves of the strike line and the dip line were gotten. A parameter calculating method based on probability integral method was used to verify prediction accuracy of overall subsidence of working face. The difference between parameters calculated by use of prediction data and the ones by use of actual data is small, which verifies feasibility of the unequal interval grey model applied in prediction of overall mining subsidence.