在城市隧道建设中,开挖可能导致邻近地下管线的变形,甚至破坏,但现行规范尚未提出具体评价方法。基于普遍认可的隧道开挖引起的地层位移公式,提出了柔性接头管线受隧道施工影响的安全性评价方法,并给出了算例。该方法考虑了管线变形后的正态曲线形态及管线与隧道的位置关系,涉及的参数较少,易于工程应用;适用于地层和管线资料不够详细的情况或在精细化计算前,对柔性接头管线安全性的预估,对于科学地提出具体隧道施工的环境监测报警值有一定的参考价值。

Urban tunneling could cause deformation or even damage of underground pipeline. But there is no method in existing specifications to evaluate the damage. In this article, we propose a safety assessment method for the deformation of flexible pipeline joint induced by tunneling based on the popular soil displacement formula, and give a calculation example in details. This method is easily applicable to engineering by taking into consideration the position relation between pipeline and tunnel and the normal curve shape of deformed pipeline, with few parameters required. It is suitable for cases with no sufficient strata and pipeline data or before fine computation when safety estimation is needed. It could also offer reference for the warning value of environmental monitoring around the tunnel.