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以南京地铁4号线下穿仙宁铁路及宁芜铁路的工程为背景，通过数值模拟的方法，分析了盾构穿越时对既有铁路的影响。研究结果表明，在盾构推进期间，将地层损失率控制在8‰及以下的情况下，由沉降导致的轨道不平顺没有超过限值；但动力学仿真结果表明，原有轨道不平顺与之叠加后引起的列车运行安全指标超过限值，需要对列车进行限速以保证行车安全。“,”By means of numerical simulation, effect of construction when shield passing the existing railway lines is analyzed. The result shows that during shield advancing, under circumstances of ground loss rate controlled at lower than 8 ‰, track irregularities caused by settlement do not exceed limits, but dynamics simulation with original track irregularity exceeds limit safety indicators caused by superimposed train operation, there is a need for train speed restrictions in order to ensure train operation safety.