本研究目的為利用湖口隧道監測資料及數值分析，探討採用新奧工法所施工之土壤隧道開挖行為，並研究可能造成過量變形之成因，以利未來在隧道工程上，對於沉陷量之控制與預測，能有更佳的成效。而所採用的二向度數值分析軟體則為Plaxis 8.6，以二向度平面應變來模擬三向度隧道開挖之行為，並導入stress reduction method來彌補以二向度模擬隧道開挖時，無法確實模擬的三向度拱效應行為，建立一個二向度的合理模擬模式。最後再經由與現地監測結果做ㄧ比較，探討其數值分析之合理性與差異性。研究結果顯示，從監測資料之整理發現，掘進開挖面所影響土體發生變形的範圍，約為開挖面前後2.5倍的隧道直徑；對於台階開挖面與仰拱開挖面之間距，也建議至少保持2.0公尺以上的距離，以確保實際施工之安全性。從數值分析之結果發現，採台階工法分段開挖之隧道，主要沉陷量皆發生於開挖上半斷面之階段，且約佔總沉陷量的85%。

The purpose of this study is to investigate the behavior of the soil tunnel, located in HOKOU, by the NATM using monitoring data and numerical analysis and find out why over-settlement during excavation is produced. The results can be used to predict and control the settlement of tunnel during excavation in the future. This study uses Plaxis 8.6, a plane strain finite element program, with the stress reduction method, to simulate the three-dimensional behavior of tunnel excavation. Compared with the in-situ measurement data, a reasonable simulation method is established. It is found from this study that range of the tunnel deformation induced by excavation is about 2.5 times tunnel diameter from the excavation face. A minimum of 2.0 m between the bench and invert excavation faces should be maintained to ensure the safety of tunnels during construction. It is found from the numerical analysis that the main settlement happened during tunnel heading excavation, which accounts for about 85% of the total settlement.

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