昆山地铁两井定向联系测量及贯通误差分析

Measurement and Error Analysis of Directional Connection Between Two Wells of Kunshan Metro

在地铁隧道施工中,常通过井上井下联系测量将地面控制网中的坐标、方位角及高程传递到井下,使地铁在施工建设阶段的测量工作在同一坐标系统中进行。论文以昆山地铁S1线为例,介绍两井几何定向的原理,探讨在竖井联系测量中,地面导线测量、定向投点、井下导线测量对地铁贯通误差的影响及精度分析,预估在拟定贯通相遇点处重要方向上累计可能达到的极值测量误差,用于指导施工实践。

In the construction of subway tunnel,coordinates,azimuth and elevation in the ground control network are often transferred to the underground through the contact measurement,so that the measurement work in the construction stage of subway can be carried out in the same coordinate system.Taking Kunshan Metro S1 line as an example,this paper introduces the principle of geometric orientation of two wells,and discusses the influence of ground traverse measurement,directional projection point and underground traverse measurement on subway crossing error and accuracy analysis in shaft connection survey,and estimate the accumulated possible extreme value measurement error in the important direction of the proposed encounter point to guide the construction practice.