The interaction between close tunnels has important role to the stability of the adjacent tunnels, especially, when the road tunnel is developing to the large span region, the significance of the interaction between adjacent tunnels is more outstanding. Because the blast working is the main method for general road tunnels to construct, which is the cause that makes the interaction between close tunnels is significantly different from the static load acted on the tunnel. This paper use the midas GTS to analyze the interaction between large span road tunnels acted by the self-weight and blast load under the different locations in the vertical plane, and have got the conclusions that the interaction between adjacent tunnels and the transportation feature of dynamic displacement and velocity in the surrounding rock and the shotconcrete lining.%双洞近距公路隧道之间的相互影响对公路隧道的稳定性有着很重要的作用,特别是随着公路隧道向大跨方向的发展,使得近距公路隧道的相互影响更加明显和重要.由于现阶段一般公路隧道的修建仍然采用爆破法施工,这使得大跨公路隧道在爆破时程荷载作用下,爆破施工隧道对邻近隧道的影响明显区别于在静力作用下的影响.采用midas GTS有限元软件,对在重力和爆破荷载共同作用下的大跨双洞公里隧道进行了动态荷载作用下的相互影响研究,得出采用爆破施工的条件下,在不同布置情况下的双洞大跨公路隧道的相互影响特征,得出隧道围岩和邻近隧道衬砌中的位移和震速随时间的变化情况.
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