不同坐标系差异对特长隧道施工精度的影响分析

为解决在施工过程中建立两期平面控制网引起的中线匹配性以及放样位置一致性问题,以某铁路特长隧道铺设无砟轨道的工程实践为例,采用坐标系间差异的相对关系分析法、不同坐标系中线放样位置一致性分析法、不同坐标系下理论中线差异分析法进行施工影响程度分析,得出独立系理论中线与施工采用的线路系理论中线在该隧道没有明显差异的结论,仍采用线路系理论中线施工和铺轨,取得较好的实践效果。

Analysis of Impacts of Different Coordinate Systems on Extra-long Tunnel Construction Accuracy

In order to solve the problem of central line incompatibility and layout inconsistency caused by the establishment of two construction plane control networks during construction,this paper employs relative relation analysis between different coordinate systems,alignment analysis of central line layout in two different coordinate systems,theoretical central line analysis in different coordinate systems to access construction impacts based on the ballastless track in an extra-long railway tunnel. The results show that there is no significant difference between the independent coordinate system theoretical central line and the line coordinate system theoretical central line,and the application of the line coordinate system theoretical central line in line construction and track laying is practical and effective.