本研究依據兩個開挖案例建立假設模型，改變影響有限土體效應之因子，探討其對開挖行為之影響及作用機制。然後依據一維分析軟體TORSA3研擬有限土體效應之一維簡化分析法，並將其結果和二維PLAXIS分析結果進行比較探討。
研究結果顯示，有限土體效應隨著鄰房深度比Ha/He之提高而上升。深度比較低的情況下，有限土體效應並不顯著，直到約達0.6~0.8有限土體效應才會有顯著的發展。在鄰近結構地下深度足夠之情形下，鄰房距牆比L/He愈小，有限土體效應愈顯著。有限土體效應開始顯著發展是由於結構物座落在土壤主要位移區，因而抑制了土壓力及擋土壁變位。鄰近結構體寬度W也會影響有限土體效應之發展。在寬度比 W/He <1.0的情況之下，由於結構體本身側向勁度較為不足，有限土體效應無法有效發揮並抑制壁體變形。在寬度比大於1.0後，有限土體效應就逐漸顯現出來。本研究建議之TORSA3一維簡化分析法能合理反應出有限土體情形下的開挖行為，但僅適用於距牆比L/He≤0.7 ，Ha/He> 0.6的情形。

Based on two excavation cases, a series of hypothetical cases were analyzed to study the influence factors of limited soil space conditions on deep excavation. Then, a simplified analytical method was developed using 1D program TORSA3. The results were compared with 2D analytical results obtained from PLAXIS 2D.
Analytical results showed that the effect of limited soil space conditions increases when the ratio of the building depth to the excavation depth (Ha/He) increases. The effect of limited soil space conditions was not obvious until the value reached 0.6~0.8, then the effect gradually developed when Ha/He became larger. If the depth of the underground structure is deep enough, the effect of limited soil space conditions increases when the ratio of the building distance to the excavation depth (L/He) becomes smaller. The effect becomes significant when the underground structure is located in the primary soil deformation zone, resulting in the reduction of the lateral earth pressure and the displacement of the diaphragm wall. On the other hand, the width of adjacent building is also a significant factor to affect the excavation behavior. When the ratio of the building width to the excavation depth (W/He) is smaller than 1.0, the lateral rigidity of the structure is too low to facilitate the development of the limited soil space conditions and the reduction in the wall displacement. After the value of W/He is larger than 1.0 the effect of limited soil space conditions gradually appears. The simplified analytical method using 1D program TORSA3 which is proposed in this study can reasonably simulate the excavation behavior under limited soil space conditions. However, this simplified method is only suitable for the conditions of L/He≤0.7 and Ha/He>0.6.

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