都會區進行深開挖工程，常遇近接施工情況，既有地下結構物與擋土壁之間形成有限寬度的土體。國內外若干開挖經驗顯示，此種有限土體引致之土壓力較無限土體引致之土壓力為小。本研究針對有限土體土壓力之極限平衡法推導中摩擦力的考量加以修改，其中非凝聚性土壤的分析原本只求出無考慮牆摩擦的結果，現加以修改以摩擦角考慮牆摩擦並重新分析出結果。凝聚性土壤之分析原本只考慮牆摩擦的情形，本研究加以修正，同時考慮牆摩擦與鄰近結構體摩擦。有限土體土壓力數值驗證分析部分也針對分析模型之邊界做了修正，讓數值模擬的土體更接近實際情況。數值分析結果驗證了極限平衡法分析。
本研究所研擬之有限土體主動土壓力係數的折減方法因不同摩擦力的考慮情形，使應用上更為多元，使用者可依實際案例之需求作適當的折減。非凝聚性土壤以正規化之折減值Rd來求得折減後之主動土壓力係數即可應用於一維程式(RIDO程式)分析。凝聚性土壤的折減則是要先查得有限土體主動土壓力係數再代入一轉換式才能得到可以使用於一維程式分析的值。根據一個大型案例分別以兩個不同分析斷面進行應用性評估，將結果與監測資料比對發現不同有限土體寬度之壁體變位有明顯差異，本研究所建議的分析方法可提供深開挖設計參考。

In an urban region, the design of a deep excavation project commonly involves the existing of adjacent buildings. Former studies have indicated that the earth pressure induced by the finite soil body is smaller than that caused by infinite soil mass. Therefore, this study modifies the wall friction consideration in limit equilibrium method analysis of finite soil body earth pressure. The original analytical results of cohesionless soil had not taken the wall friction into account, this study uses the friction angle to consider the wall friction and analyze the results. The original analytical method of cohesive soil had only taken the wall friction into account, this study adds the consideration of both the wall friction and the adjacent buiding’s friction. The methods developed in this study had been numerically verified by finite element method. The boundary condition for finite element analysis was also modified in this study to better represent the field condition. The results of the limit equilibrium method are well validated by the results of finit element analysis.
The analytical methods proposed include seneral possible scenarios of wall friction consideration. So, engineers can choose the suitable one based on the situation of real case. For cohesionless soil, the lateral earth pressure of finite soil body can be determined by the normalized reduction factor Rd. For cohesive soil, the lateral earth pressure can be calculated using the equivalent coefficient of lateral earth pressure of finite soil mass and an equation to transform the coefficient into the value which can be used in 1-D analytical program (RIDO Program). This study also studied two different sections of a large-scale field case to verify these foregoing findings and evaluate its applicability. Both the analytical results and the measured values indicated that finite soil body does have significant effects on the wall displacements. Thus, the analytical methods developed in this study can be adopted for the design of deep excavation under such circumstance.

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