研究结论:基于武汉地铁二号线江积区间的地质特征，建立了有限差分模型。对盾构始发阶段的施工过程，分6 步进行了模拟。对右线开挖30 m 后的竖向位移，取不同截面进行了分析。同时，分析了始发过程中数值模拟结果与现场监测数据的差异，并从差异中分析得到了二者共同的规律，如部分沉降曲线类似，可以为盾构始发的数值计算、工程分析与预测提供参考。
Abstract：Research purposes: Shield construction is one of the major methods for metro construction． The big difference exists in features between the start section and the standard section in shield construction，such as the reinforcement area in the end section． It is necessary to investigate the features of the numerical simulation and the field monitoring data to know the special laws that fit to the start section．
Research conclusions: The finite difference model was established on the base of the soil properties of Jiangji Section of Line 2 of Wuhan metro． The shield construction process of the start section was simulated by 6 steps． The vertical displacements after excavating 30 m of the right track were analyzed by sampling the different cross － section while the analysis was made for the difference between the numerical simulation result and the field monitored data about the start process to know the common points of them for providing the reference to the numerical calculation，engineering analysis and engineering prediction of the start section of shield construction．
Bao Yongliang， Zheng Qizhen， Tang Jianzhong．Technology for Originating Construction of Shield Tunnel in Soft Soil Stratum in Shanghai［J］． Journal of Railway Engineering Society，2010( 3) : 118 － 122．
Yuan Dajun，YinFan，Wang Huawei，etc． Study of Soil Disturbance Caused by Super － large Diameter Slurry Shield Tunnelling ［J］． Chinese Journal of Rock Mechanics and Engineering，2009( 10) : 2074 － 2080．
Wang Yuan，Liu Songyu，Tan Yuehu，etc． Analysis and Information Construction of Pukou Deep Foundation Pit of Nanjing Yangtze River Tunnel［J］．Chinese Journal of Geotechnical Engineering，2009( 11) :1784 － 1791．
2011, Vol. 28 
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