Shanghai rising demand for large diameter tunnel,how to minimize the tunnel construc-tion the effects on the environment has become a hot research topic.Outside diameter of 13.95 m wel-come three road tunnel as an example,by empirical formula,and field measurement,research on tunnel subsidence under the condition of sensitive area and bad geological condition,caused by surface deforma-tion control of shield tunnel.Empirical formula and field observations show that the regional volume loss should be controlled within 0.2%,ensures maximum ground settlement is less than 10mm;Besides vol-ume loss in 0.81 % of the time,the settlement trough width coefficient of predicted values and measured values are not have good consistency,when I =Z0 to fitting the data obtained from the tunnel excavation process,the parameters within the range of 0.31 to 0.37,lower than the small and medium-sized tunnel suggest a value of 0.5,research results to provide a reference for the related engineering.%上海对于大直径隧道的需求不断增长，如何最大限度降低隧道施工对环境造成的影响已成为研究热点。以外直径为13.95 m 的迎宾三路隧道为例，采用经验公式计算，并进行现场实测，研究在隧道穿越沉降敏感区和不良地质条件的情况下，由盾构隧道引起的地表变形控制。经验公式和实地观察表明，该区域体积损失应被控制在0.2％以内，可保证地表最大沉降量不超过10 mm；除容积损失在0.81％的情况外，沉降槽宽度系数预测值与测量值不具有较好的一致性，当用 i ＝Z0去拟合隧道开挖过程中获得的数据，参数 a 在0.31～0.37区间，低于中小隧道建议值0.5，研究成果可供相关工程参考。
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