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在城市轨道交通建设过程中,如何确保隧道正确贯通是土建施工测量面临的重要问题。目前越来越多的轨道交通工程建设受地表沉降影响,在地面沉降比较大的地区,地面沉降已成为高程贯通误差的重要影响因素。本文结合北京地面沉降特点,分析了地面沉降对高程贯通测量误差的影响,采取了相应的测量措施,并在北京地铁8号线二期进行了实践,结果表明该措施切实可行。
In the process of urban rail transit construction, how to ensure the correct tunneling is an important issue for civil construction survey. At present, more and more rail transit projects are impacted by surface subsidence. In areas where ground subsidence is relatively large, land subsidence has become an important factor affecting the elevation through error. Based on the characteristics of land subsidence in Beijing, the paper analyzes the influence of land subsidence on the measurement error of elevation and adopts corresponding measures. The practice is carried out in the second phase of Beijing Metro Line 8. The results show that the measure is feasible.