Prediction of vibration waveforms and the determination of influence zones under the action of tunnel cutting blasting
To study the impact of cut hole blasting on existing buildings on the surface of the tunnel during tunneling,a surface particle vibration waveform prediction function was constructed,and a method of dividing the affected area based on the vibration waveform theory was proposed.First,starting from the theory of ground vibration waveform caused by the equivalent spherical charge blasting in a semi-infinite elastic medium,considering the characteristics of ground vibration in the actual medium,combining the Sadolfsky formula and the frequency prediction formula similar to its form,the fitting coefficient and equivalent the coefficients in the source intensity function are connected to construct a surface vibration waveform function suitable for actual engineering;Then the correctness of the surface particle vibration waveform function is verified through on-site monitoring data;Finally,the peak vibration velocity and cumulative displacement of the particle are used as the control standards.Divide the area of influence.According to the calculation results,appropriate controlled blasting measures should be taken when the horizontal distance between the tunnel face and the protected object is D=50 m.
tunnel blastingvibrationwaveform predictioninfluence zone
万方数据
维普
