Study on the Prediction Correction of Blast Vibration Speed Under Vibration Reduction Measures for Tunnel Proximity Project
Accurate prediction of blasting vibration velocity is an important content to effectively control blasting hazards when tunnel and underground engineering are close to construction.In order to accurately predict the blasting vibration velocity of newly-built tunnel with vibration damping measures,the damping coefficient is introduced on the basis of the normative empirical formula to modify the prediction formula of blasting vibration velocity.Based on the blasting operation of Dongming Tunnel through an existing structure,field tests were carried out,combined with blasting vibration monitoring data,the blasting vibration formulas with different vibration damping measures were fitted by regression analysis method.The shock absorption coefficients φ1 and φ2 of the shock absorption hole method and the wire saw cutting method are obtained,indicating that the latter shock absorption effect is more remarkable;in terms of the blasting data of the underpass section,the error is reduced from 31.12%to 12.24%by comparing the use of modified blasting center distance fitting with unmodified cases,which shows that it is feasible to introduce damping coefficient into the prediction of blast velocity.It can provide a theoretical basis for determining the blasting safety allowable distance and predicting the blasting vibration velocity of the formal underpass section.
proximity tunnelprediction of blast velocityvibration reduction measuresequation correctiondamping coefficient
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