The Vibrational Effect Study Of The Road Tunnel Under Explode Excavation

Considering the blast gas and the stress waves interaction, the blast loading calculating pattern is created based on the study of blast mechanism. The analytical numerical simulation and the finite element numerical simulation are used to calculate the vibrational effect in proceed of the road tunnel explode excavation. The main researches of this paper are as follows:1,By analyses the blast loading pattern and the attenuate relation and effect of the disperse dynamite package, the multi-hollow blast loading, and the blast loading pattern of the control blast are obtained. Additionally the blast loading of ChaoDongYan Tunnel is calculated.2,The ChaoDongYan flexibility modulus is calculated by defined trauma variable, the propagation of the stress waves in the tunnel country rock is simulated, the blast loading as input.3,The ChaoDongYan Tunnel finite element calculating model is created. The blast loading as input, the numerical simulation of the propagation of the stress waves in the tunnel country rock is making, and the load input is the blast loading.4,Comparing the results of the field test,analytical numerical simulation and finite element numerical simulation, the finite element numerical simulation can quite intuitivism simulate the propagation of close quarter stress waves, it is suitable that finite element simulation is used to simulate the propagation of close quarter stress waves. The analytical numerical simulation results can approximate the results of field test, also can directly solve the dynamical response arbitrarily every moment in the point that need to know, but the parameter is often difficult to definitize, the calculating results may have deviation, and can only apply to the calculation of stress waves out of a distance from the blasting source.