由於潛盾隧道在施工期間對都會區的地面交通衝擊較少，目前已被廣泛使用在地下捷運系統之興建。本研究使用有限元素法，進行黏土層中併行潛盾隧道互制現象之相關研究。分析過程中是以SPECTROM-32有限元素程式為數值分析工具，應用平面應變架構之分析模式，採用八結點等參數元素，並考慮土壤為不排水狀況，使用莫耳－庫倫降伏準則來進行彈塑性分析；並配合離心模型試驗，以驗證此分析模式之適用性。 除了數值結果與離心模型試驗進行比較外，另外亦針對各項參數之影響進行研究，其中包括深徑比(C/D)與寬徑比(d/D)之影響、楊氏模數與不排水剪力強度之影響，藉由數值分析之參數控制，以補充試驗之不足。 Shield tunneling has been widely used to construct the subway in order to reduce interfering with the surface traffic. In this study, elastoplastic finite element method is applied to analyze the interaction on parallel shield tunnels in soft clay. Plane strain eight node isoparametric elements are adopted and Mohr-Coulomb criterion is used for simulating the elastoplastic stress-strain and undrained behavior of soil. Numerical analysis is carried out to investigate the distribution of settlement and moment of tunnel lining during the closure of tail voids. The numerical results using “SPECTROM-32” under plane strain condition were compared with the results from centrifuge model tests. In addition to the results compared with centrifuge model tests, this analysis and evaluations are also carried out following parametric study, which investigates the effect due to (C/D) ratio, (d/D) ratio, Young’s modulus and cohesion.
