二向度分析屬於平面應變狀態，假設單元開挖長度為無限長，無法模擬三維
效應影響及反映真實開挖影響，本研究利用有限元素法進行三向度分析連續壁施
作，探討施作連續壁造成的地盤變位分析了解周圍的土壤應力變化，找出相對
較合理的分析過程，了解連續壁施作造成影響。以往研究常使用土壤組成律為莫
爾-庫倫(Mohr-Coulomb model)進行分析，此研究選用土壤組成律為土壤硬化模式
(Harding soil model)，可以相對反映土壤在解壓 /在壓時的真實行為。
以監測結果找出合理的數值模擬施作過程的其依據觀察地盤變位影響和應
力變化，找出施作過成中發生的影響因素。使用多項參數研究針對施作連續壁時
造成影響進行討論，找出其中重要議題，提供工程應用之參考。另外，在台北地
區開挖連續壁時經常發生槽溝崩塌意外，此研究利用強度折減法分析連續壁穩定
性，利用穩定液高度變化作為研究， 探討穩定液高度與地下水高度差造成槽溝穩
定性影響。

For two dimensional (2D) analysis or plain strain condition, assuming trench of unlimited length, cannot simulate (three dimension) 3D effect and reflect real excavation behavior. This research uses 3D finite element method to analyze cast diaphragm wall by 3D model. The objectives of this study are: (1) study the soil displacement in casting diaphragm wall, (2) understand the stress change around soil layers, and (3) find the suitable analysis procedure. In the past, many studies have used Mohr-Coulomb (M-C) model in their analysis, but this research uses Hardening Soil (HS) model because it can relatively reflect real soil behavior during loading/unloading process.
By observing soil movements and stress changes of numerical and monitoring results, the factors which can influence the numerical simulation are investigated. Then, this study find a reasonable simulation procedure of diaphragm wall installation for Taipei basin region. In addition, multiple trench parameters are also investigated to identify their effects. The obtained results can provide a good reference for engineering application. In Taipei, local trench collapse frequently occurs during trench excavation. Therefore, strength reduction method is applied to analyze trench stability while varying bentonite height level. The trench stability is then studied by comparing the difference in height between bentonite and ground water level.

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