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目前对工程中大量出现的既有山岭隧道上方挖方等近接工程施工的影响研究尚鲜见报道。在建永吉高速公路洞上河高架桥与焦柳铁路洞上河隧道并行,其9#~11#墩距离既有隧道水平距离25~30m不等。为确保桥桩施工中既有隧道的运营安全,制定了临近隧道的桥桩水磨钻施工方案,并对桥桩水磨钻施工对既有隧道的影响进行了数值模拟分析,分析表明:采用水磨钻法人工挖孔桩施工引起的既有隧道距桩基距离最近的右侧拱腰处振动峰值位移4.7mm,振动峰值速度2.85mm/s,因此施工带来的振动对既有铁路隧道影响不大。
At present, there are few reports on the impact of excavation and other near-existing projects on the existing mountain tunnels, which have appeared in large quantities in the project. The viaduct of Dongjianye River on Jiangyi-Jiqi Expressway is in parallel with the tunnel on the tunnel above Jiao-Liu Railway, and the distance from 9 # to 11 # pier is 25 ~ 30m away from the existing tunnel. In order to ensure the operation safety of the existing tunnel during the construction of bridge piles, a bridge drilled construction scheme was put forward and the effect of the bridge drilled construction on the existing tunnels was numerically simulated. The results show that: The vibration peak displacement of the right arch and waist with the distance between the existing tunnel and pile foundation caused by the construction of artificial digging hole pile is 4.7mm and the peak vibration velocity is 2.85mm / s, so the vibration brought by the construction has little effect on the existing railway tunnel .