铁路隧道下穿公路引起的路面沉降规律和控制基准研究

Study of road surface settlement rule and controlled criterion for railway tunnel undercrossing highway

目前,铁路隧道下穿公路引起的施工沉降规律和控制基准研究都是以某具体工程为背景制定的,缺乏统一的控制基准。从公路纵坡、横坡、平整度及工程结构稳定本身的需要出发,通过比较分析,提出了采用平整度要求控制施工路面不均匀沉降;在考虑路基高度、隧道尺寸、埋深、地质和施工方法影响条件下,通过FLAC数值计算软件对单双线铁路隧道下穿公路的数值模拟,分析路面沉降规律,得到了沉降槽宽度系数和最大沉降量的预测模型;结合平整度要求及沉降槽宽度系数预测模型制定了铁路隧道下穿公路引起的路面沉降控制基准。通过大量工程实例来验证了提出的沉降控制基准的合理性,其结果可为铁路隧道下穿其他建筑物引起的地表沉降控制基准的制定提供参考。

At present,there is no unified surface settlement rule and controlled criterion for the settlement induced by railway tunnel undercrossing highway,which is researched only based on an actual project.From the aspects of longitudinal-transverse slope,smoothness,and requirements for stability of highway,the requirements for smoothness are adopted to control road surface uneven settlement during construction.According to embankment height,tunnel size,depth,geology,construction method,construction process of single and dual-lane railway tunnels undercrossing highway is simulated by FLAC software.The rule of road surface settlement is studied.In addition,the width coefficient of settling tank and prediction model for the largest settlement are obtained.Based on them,pavement surface settlement controlled criterion is established for railway tunnel undercrossing highway.At the same time,the rationality of controlled criterion is verified through several case studies.The results can provide reference for establishment of pavement surface settlement controlled criterion for railway tunnel undercrossing surface buildings.