8. Comparison of results and probable causes
Fig. 14 illustrates the comparison of predicted PPV by different predictors and by ANN with measured PPV in field. Here, ANN line is following the measured PPV line in very nice manner but other PPV predictors are unable to predict the PPV which is close to the observed values in the field. If the safe charge of explosive is calculated based on the above predictors, certainly one can face problem to control the ground vibration. It may be sometime under estimate or over estimate the explosive requirement. The use of any predictor without validation causes damage to the surround and hindrance to the mine smooth working.