在快速發展的現代城市中，深開挖工程是一個相當重要且複雜的三向度問題。因此，如何預防開挖引致之災害的發生應是重要的議題。本研究以ABAQUS耦合分析之成果做為基礎，經由土壤及結構物參數的擬合與律定後，再應用PLAXIS 3D與SAP2000進行開挖與鄰近結構物之解耦分析比較與探討，藉此來驗證解耦分析方法的合理性。接著應用解耦分析方法來探討不同結構物位置對於開挖行為和結構物反應之影響。
根據驗證分析的結果，解耦分析方法確實可以得到合理的三向度開挖之非線性行為與結構物非彈性的反應。研究結果也顯示，解耦分析方法提供了一個較為簡易且實用的分析方法。以解耦方法分析不同結構物位置對於開挖行為與結構物反應之結果顯示，地表沈陷量與牆土壁體變形量的趨勢確實會影響整體的結構物的行為。解耦分析方法所求得之結構物之角變量、側向應變及塑性鉸等，皆可提供建物損害評估之重要參考，值得進一步研究。

In a modern city of rapid development, the deep excavation is a very important and complex 3D engineering problem. Thus, how to prevent the occurrence of the disaster caused by the excavation should be an important issue. In this study, using the results of ABAQUS coupled analysis as a basis, the decoupled analytical method using PLAXIS 3D and SAP2000 is verified for its applicability of the excavation problem with the adjacent building. Soil parameters in the ABAQUS analysis are converted to equivalent parameters for PLAXIS 3D analysis to facilitate comprehensive comparison. Then, the decoupled method is used to analyze the excavation behavior and the responses of adjacent structures located at different locations.
According to the verification analysis, the decoupled analysis method can indeed obtain reasonable results of three dimensional at nonlinear behaviors of the excavation and in-elastic responses of the nearby structure. Decoupled analysis technique is also proven to be a relatively simple and practical method. Studies on the excavation and the adjacent building show that, the trend of the wall deflection and ground displacement can significant affect the adjacent structures behavior. The decoupled analysis can provide many useful excavation-induced structure responses such as angular distortion, lateral strain and plastic hinges. All of them can provide valuable indices to evaluate the building serviceability and thus warrant further study.

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