本研究使用實際案例進行有限土體開挖分析，藉由分析結果精進一維簡化分析法並驗證其可行性。現地監測結果和PLAXIS-2D分析結果皆顯示此案例之自由場壁體變位大於鄰房場，證實有限土體效應確實存在。接著，以二維分析結果為基礎，將鄰房擋土牆之影響納入原本的一維簡化分析法中進行精進。結果顯示在鄰房基礎深度比(Ha/He)為0.5~1.2時需要考量鄰房擋土牆存在，且在有考量的情況下一維有限土體影響深度Hm=min(1.2He,1.55Ha)。此外，分析結果也顯示鄰房基礎深度比(Ha/He)超過1.5之後，有限土體效應比已達到穩定狀態。因此，鄰房基礎深度比若超過1.5，有限土體效應比只需要考量至鄰房基礎深度比為1.5即可。
最後，本研究使用實際開挖案例進行精進後之一維簡化法的分析，藉此驗證一維簡化分析法與黏土層設計圖表之可行性。結果顯示利用TORSA3一維簡化分析法能合理反應出有限土體情況下的開挖行為，且一維與二維分析結果相似。

This study conducts excavation analyses under limited soil space conditions using real excavation cases. Then, this study improves the one-dimensional simplified analysis method and verifies its feasibility. Both monitoring results and numerical results using PLAXIS-2D show that the diaphragm wall displacement of the green field side is larger than that of the adjacent building side. The analysis results and the monitoring results confirmed the existence of finite soil effects. Then, the influence of the retaining wall of the adjacent building is incorporated into the original one-dimensional simplified analysis method for consideration based on the results of the two-dimensional analysis. The results show that when the adjacent building foundation depth ratio (Ha/He) is 0.5~1.2, it is necessary to consider the existence of the adjacent building retaining wall, and the one-dimensional finite soil influence depth Hm=min(1.2He, 1.55 Ha). In addition, the results also show that when the adjacent building foundation depth ratio(Ha/He) exceeds 1.5, the finite soil effect reaches a stable state. Therefore, if the adjacent building foundation depth ratio exceeds 1.5, the finite soil effect ratio only needs to be considered to the adjacent building foundation depth ratio is 1.5.
Finally, this study uses real excavation cases to conduct the one-dimensional simplified analysis. The results verify the feasibility of one-dimensional simplified analysis method and the designed chart for clay. The results show that the one-dimensional simplified analysis method of TORSA3 can reasonably reflect the excavation behavior under limited soil conditions, and the results of one-dimensional and two-dimensional analyses are similar.

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