A Comparative Analysis of Grey Models for Displacement Prediction

Now there are many prediction models based on grey theory, however, the precision, adaptability and efficiency may be quietly different, so it is essential to choose a more suitable prediction model for the stability evaluation of tunnel surrounding rock-support system. In the paper, some typical grey prediction models were discussed and compared from aspects of precision, adaptability, computational workload. And a most efficient approach with smallest total error and better adaptability for non-equal interval sequence was found. Meanwhile, it was proved that the background value would be a vital factor in creating a grey model, and the prediction precision and adaptability of grey model can be highly improved through ameliorating background value.