基于点位固定和方位修正的地铁长距离隧道基线测设和贯通误差预计方法

Base on the Measurement of the Baseline and the Breakthrough Error of the Metro Long Distance Tunnel Based on the Fixed Point and Azimuth Correction

以东莞市轨道交通R2线工程西平站-蛤地站右线隧道为例,长距离隧道中部二次始发基线的控制点点位固定为前提,结合隧道导线测量二次始发基线的方位角修正,从理论上证明了此方法对于间接缩短隧道贯通距离、提高隧道控制点点位精度和横向贯通精度有显著的效果。

In this paper, taking Dongguan rail transit line project of Xiping railway Station to R2 clam stand right line tunnel as an ex- ample, long distance tunnel middle two originating baseline control bit fixed as the premise, combined with the tunnel traverse two o- riginating baseline azimuth correction, the method for shortening the distance from the tunnel through indirect proof theory and improve the tunnel control point position precision and lateral penetrating accuracy has a significant effect.