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在地下工程设计过程中,两座隧道线路交叉时,如何保证工程的安全性是目前山区隧道工程常遇到的问题,以某高速公路上跨铁路隧道为实例,用规程规定的方法核算新建隧道爆破施工对已建隧道的振动影响大小,然后采用有限元方法对施工过程进行三维数值模拟分析,结果表明,爆破振动对已建铁路隧道影响较小,新建隧道施工开挖对已建隧道力学性状影响有限。新建公路隧道开挖影响范围明显区域在其一倍洞径范围内,研究结果可为类似工程的选线和设计计算提供参考。
In the process of underground engineering design, how to ensure the safety of the project when crossing the two tunnels is a common problem encountered in the current mountainous tunnel project. Taking an example of a railway crossing a highway on a highway, the new tunnel The impact of blasting construction on the vibration of the tunnel has been established, and then the three-dimensional numerical simulation of the construction process using finite element method shows that the blasting vibration has little effect on the railway tunnel already built. Limited impact. The results show that the new area of tunnel excavation with obvious influence range of excavation within one times of its diameter can provide reference for route selection and design calculation of similar projects.