摘要:本文依托武汉地铁四号线一期武昌火车站站-梅苑小区站区间盾构隧道下穿武昌火车站国铁站场的工程实例，通过在地表线路和轨枕上布置沉降测点并跟踪施工进程进行监测，探讨地铁盾构隧道施工对地表线路变形的影响，以及盾构隧道下穿国铁线路股道可能出现的风险因素及影响，提出了相应的防护措施。本工程对地表线路和轨枕沉降进行跟踪监测，通过对监测数据的分析及时调整盾构掘进施工参数，保持盾构开挖面的稳定和管片脱出盾尾时及时采用同步注浆、二次注浆来填充盾尾建筑空隙等措施，以确保工程和铁路行车安全。监测结果表明：盾构隧道施工方案是合理可靠的，同时也通过对监测数据的分析，提出关于类似工程施工的一些建议。

Abstract: This paper introduces the engineering example of the first issue of Wuhan no.4 metro line of Wuchang railway station ~ Meiyuan district station which shield tunnel crossed the Wuchang railway station.By arranging observation points in the earths surface and sleeper on the settlement in the lines, the construction process can be monitored.The subway shield tunnel construction influence on surface deformation lines can be discussed, and the corresponding protective measures can be put forward which are caused by the shield tunnel crossing railway station and possible risk factors.In this paper, the project tracked and monitored on surface subsidence line and sleeper.With the monitoring data analysis and timely adjustment of shield tunneling construction parameters, to maintain the stability of the excavation face shield and prolapsed shield tail pipe, and take measures of synchronous grouting, secondary grouting to fill voids shield tail construction and other measures in time to ensure the safety of the projects and railway traffic.Monitoring results showed that shield tunnel construction scheme is reasonable and reliable.By the analysis of the monitoring data, some of the recommendations of the similar construction can be offered.