潜盾隧道施工所引起地表沉陷之影响因素很多，其中以潜盾隧道直径大小，隧道施工质量有关之土层漏失率，土层工程性质及潜盾隧道埋深等影响最大。针对上述影响因素，采用数值模拟方式逐项探讨各项因素对于潜盾隧道施工所引起地表沉陷之影响。由于各相关因素系属同时间发生，就逻辑而言可采用乘法原理表示各相关因素之共同组合效应。因此各相关影响因素经逐项探讨后，综合整理归纳提出潜盾隧道施工所引起地表沉陷之预测公式。经与Peck教授公式及实际监测值比较，验证此预测公式之可信度后提供工程界参考。

The key factors that affect the ground settlement caused by shield tunnel are diameter, ground loss, engineering properties of soil and buried depth of shield tunnel. By means of the numerical analyses, this paper integrates all of these key factors into a simple formula. In addition, soil condition profoundly rules the ground settlement and thus, a modified factor in terms of soil condition multiplies by the proposed formula to be available for varied ground conditions. To verify the accuracy of the formula, the predicted results are compared with the monitored results obtained from Taipei and Kaoshiung MRT shield tunnels. It is expected that the proposed formula is able to serve as a basis for engineering practices.