|
Abstract Vibration monitoring and acoustic detecting to rock slopes under blasting excavation at the altitude of 834.0–770.0 m on the left bank abutment slot of Baihetan hydropower project were carried out and the vibration attenuation of the first to the sixth bench was analyzed. The relationships between the peak particle velocity(PPV) and the damage depth at different distances to the blast center were obtained with the method of regression analysis. These relationships were applied to predict the damage depth of the seventh bench using the results of vibration monitoring. When the lithology of the slope was uniform and there was no large structural plane in the rock mass，the PPV at certain distance to the slope had a high correlation with damage depth. Predicting the damage zone using the correlations between vibration attenuation of pre-splitting blasting and damage depth of reserved rock mass was simple and convenient，thus greatly reducing the massive acoustic detection workload of rock slopes. Taking the geological conditions and physiognomy changes induced by excavation into consideration，other factors needed to be involved in regression analysis or acoustic detection points of key positions are supplemented to promote the prediction accuracy of damage depth.
|
|
|
|
|
|
2016, Vol. 35 
