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1引言某南方公路隧道二期工程是在与既有隧道南侧中心线间距较近的情况下,新开挖一条平行隧道。新建隧道全长2.270km,最大开挖宽度11.28m,最大开挖高度8.34m,为双车道公路隧道。隧道中心线间距25.00m,净间距小于13.5m,为小净间距公路隧道①。考虑到新建隧道在开挖过程中,爆破地震会对既有隧道产生一定程度的影响,为确保既有隧道及其运营安全,进行了既有隧道爆破开挖过程的动力测试与分析。
1 Introduction The second phase of a southern highway tunnel is to excavate a new parallel tunnel under the condition that the centerline of the south side of the existing tunnel is close to the center line. The new tunnel has a total length of 2.270km, a maximum excavation width of 11.28m and a maximum excavation height of 8.34m, which is a two-lane road tunnel. Tunnel centerline spacing 25.00m, the net spacing of less than 13.5m, a small clear-cut highway tunnel ①. Taking into account the new tunnel excavation process, blasting earthquake will affect the existing tunnel to some extent, in order to ensure the safety of the existing tunnel and its operation, the existing tunnel blasting excavation process of dynamic testing and analysis.