【摘要】 随着地铁工程建设的大规模开展,柔性管线的安全评价是一项急待解决的关键技术问题。柔性管线安全评价应包括施工前预评价和施工中评价。文章针对单线隧道和双线隧道及管线与隧道走向垂直和平行的四种不同情形进行分析,先以管线接头转角为控制指标,进行施工前预评价;再以管线沉降为控制指标,进行施工中评价。然后基于不利因素的影响分析,利用增大系数Ki对柔性管线的安全评价公式进行修正。最后通过对具体工程实例进行安全评价,证明了此安全评价方法的实用性。更多还原

【Abstract】 Given the large-scale development of metro construction, the evaluation of the safety of flexible pipe-lines in the upper-lying stratum is one of the key concerns, requiring evaluation before construction and interimevaluation during construction. In this paper, four cases of a single-tube tunnel and a double-tube tunnel, being par-allel and perpendicular to the pipelines, respectively, are analyzed. First, the rotation angle of the pipe joints is usedas a control indicator to carry out the evaluation before construction, and then the settlement of the pipelines is tak-en as a control indicator to carry out the interim evaluation during construction. Based on an analysis of several ad-verse factors, the amplifying coefficient Ki is used to revise the safety evaluation formula for flexible pipelines. Final-ly, the safety evaluation for a specific project case is carried out to prove that this safety evaluation method is practi-cal and effective.更多还原