基于三维整体平差的隧道贯通精度探讨

Improvement of tunnel holing-through accuracy based on 3D total adjustment

地铁隧道的贯通精度受多种因素影响,其中地下测量的极限误差较大,传统采用导线测量和精密陀螺仪定向较多。本文借鉴高铁建设使用的CPⅢ测量方法,利用隧道自动全站仪测量数据,利用三维平差方法对隧道导向精度进行研究,重点分析地下控制点、联系观测点、隧道直径和观测精度对导向精度的影响,以及如何通过适当的方法来提高精度。

Subway tunnel holing-through accuracy is affected by many factors, including the underground measurement which is one of the main sources of error and often uses traditional wire measurement and precision gyro orientation. The author selected the measurement data of automatic total station in the tunnel, and discussed the tunnel guiding accuracy using 3D adjustment methods. The paper focused on the effects of underground control points, public observation points, tunnel diameter and observation accuracy on guiding accuracy, moreover, proposed some methods to improve the accuracy.