Analysis and Prediction on the Blasting-induced Peak Particle Velocity in Tunnel Construction
By recording the blasting parameters for each blasting operation and monitoring the induced vibration waveform,an analysis is conducted to analyze the distribution characteristics of the peak particle velocity within the tunnel,and models predicting the peak particle velocity are also established.The vertical peak particle velocity is significantly different than the other two directions,and the average and max values are noticeably larger.The distributions of peak particle velocity from the vault and baseboard are similar,while the peak particle velocity from the hance and side wall could be considered as following the same distribution.The average and max values of the peak particle velocity from the vault and baseboard are significantly larger than that from the hance and side wall.In terms of the goodness of fitting R2 on the test set,the R2 of the established Sadaovsk empirical formula of the vault-baseboard and hance-side wall are 0.64 and 0.78,respectively.The R2 of the established XGBoost model of the vault-baseboard and hance-side wall are 0.93 and 0.91,respectively,which outperforms the Sadaovsk empirical formula as its R2improves 45.3%and 16.7%.These results show that the XGBoost model is capable as a high precision prediction model,and could be applied to the working filed.
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