联系三角形定向在地铁盾构隧道中的应用分析

针对盾构法施工地铁隧道竖井井口较大的特点，采用联系三角形定向法进行平面联系测量较容易布设成优化的三角形形状，通过精度评定及测量实例分析，从理论与实践上验证了该方法能够达到满足地铁贯通要求的定向精度，在竖井井口较深且具备布设条件时联系三角形定向可作为盾构隧道平面联系测量的首选方法。

Application and Analysis of Connection Triangle Orientation in Shield-driven Metro Tunnels

In shield-driven Metro tunnels, the shaft mouth is large. In plane connection survey, the method of connection triangle orientation is adopted and the connection triangle can be optimized easily. The accuracy assessment and survey case analysis demonstrate that the method of connection triangle orientation can meet the precision requirements of Metro tunnels both in theory and in practice. Where the shaft is deep and the connection triangle can be arranged, the method of connection triangle orientation can be adopted as the preferred method in the plane connection survey of shield-driven tunnels.