Abstract:

As the difficulty in the excavation of deep underground works under vibration effect increases, the safety and stability of the excavation of deep underground works become more and more important. In this paper, the stability of the excavation of deep tunnels under the action of the point vibration source and the seismic surface wave disturbance is calculated by means of numerical simulation, and the propagation and attenuation laws of source wave and its effect on the stability of underground works are analyzed. The research results show that: 1) The source wave spreads in the direction of roadway and spreads constantly around the roadway, and causes roof subsidence, side wall extrusion and floor heave; 2) The surrounding rocks of the roadway without supporting have been severely disturbed, as a result, the support for the excavation should be strengthened and flexible impactenergyabsorbinglayer should be installed so as to reduce the damage. The paper can provide reference for the control of the safety and stability of the excavation of similar deep underground works in the future.

Key words: seismic surface wave, deep tunnel, surrounding rock, DruckerPrager criterion