隧道工程在進行開挖時，對於路面交通的影響頗大，因此在開挖時，若採用潛盾工法將會減少對路面交通之影響。本研究使用有限元素法，針對潛盾隧道開挖，所造成之地表沉陷進行分析。本文分別對於單隧道與雙隧道進行探討；單隧道是採三向度的分析，分析內容為潛盾開挖對地表沉陷之影響，並就其深徑比（C/D）、未襯砌長度、與隧道直徑比（P/D）等參數之影響進行研究；而雙隧道方面則是採二向度平面應變分析，觀察雙隧道中之新挖隧道，在盾尾間隙閉合時，所造成地表沉陷的影響。 本研究之分析係以ABAQUS有限元素分析程式作為數值計算工具。並將數值分析結果與離心試驗結果比較，藉由對照離心試驗以驗證數值分析模型的正確性。 Tunneling affects the traffic over the ground significantly .In order to reduce the influence under construction of tunneling , we can used shield machine tunneling method comprehensively . In this study , finite element method is applied to analyze the influence on surface settlement caused by shield tunneling in soft clay. In this research , we study single and dual tunneling problems separately .Under three-dimension condition , single tunneling problems investigate the effect of surface settlement due to shield tunneling , (C/D) ratio ,and (P/D) ratio . Under two-dimension condition , dual tunneling problem investigate the effect of surface settlement due to shield tunneling ,and (C/D) ratio . The numerical results using code ABAQUS were compared with the results from centrifuge model tests.
