Numerical Evaluation of Dynamic Response of Blasting Excavation to Underpass Existing Tunnel
Based on the engineering background of Xinlin tunnel passing through the diversion hydro-power station,the blasting vibration response law of Xinlin tunnel passing through the diversion tun-nel was analyzed by ANSYS/LS-DYNA finite element software,and the reliability of the model was verified by combining with the field measured data.The vibration response of existing tunnel section caused by different excavation advancing distances was analyzed,then the damage limit value of exist-ing tunnel was put forward and the damage range of tunnel was determined.In view of the problems existing in practical engineering,considering the safe operation of existing tunnels and ensuring the stability of surrounding rocks,37 working conditions were simulated,and the optimized blasting scheme was suggested.
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