| The the tunnel is widely used in the transport project in order to improve the design srandard and reduce energy consumption. While there are many tunneling construction method, but the mining method is still the main construction methods in the future for a long time because of technical and economic reasons. In construction of mining method, the blasting load will have negative effects on adjacent tunnel and tunnel itself. Especially there is a cavity in the surrounding rock, the behavior of tunnel will be more complex. This paper study on the influence on dynamic stability of adiacent tunnel and tunnel itself under the blasting load of the cavity with the FDM and wave theory. The main results in this paper is divided into five parts, they are as followed.(1) When the cavity located in behind of tunnel straight wall, the cavity only have a lager influence on the x vibration velocity of adjiacent straight wall. The cavity has amplification effect on velcocity. The amplification effect weakened with the increase of the distance between the wall and cavity.(2) The amplification effect on velcocity of cavity increases with the horizontal dimension and vertical dimension increases. And the vertical dimension more noticeable than horizontal dimension.(3) When the cavity located in behind of tunnel straight wall, The cavity only have a lager influence on the x vibration velocity of adjiacent straight wall.When the cavity located upon the vault. The cavity only have a lager influence on the y vibration of vault.(4) When the cavity located in the behind of adjacent tunnel back-blast side, The positions and sizes of cavity have on influence on the vibration velcvity.(5) When the cavity located between the two tunnels, The cavity has damping effect, would be favorable for the vrbration resistance. |
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