本研究以實際開挖案例為依據，應用PLAXIS 3D程式探討開挖引致之三維有限土體效應。分析結果顯示開挖時鄰房側確實會呈現有限土體效應，此結果與二維分析結果及監測值都相同。接著，本研究以此驗證後之實際案例之三維模型和參數為基礎，進行一系列假設案例數值分析。假設案例之三維分析結果得知，隨著鄰房長度的增加有限土體效應則愈來愈顯著，當鄰房長度增加至0.9倍開挖寬度時，有限土體效應則接近於完全發揮。
本研究為探討三維有限土體效應之影響範圍，以雙曲線模式回歸假設案例分析結果，並藉由Tangent Intersection 方法量化三維有限土體效應之影響範圍。研究結果顯示：(1) 鄰房長度比(L_b\L_e)<0.1，可視為自由場，無需考慮有限土體效應分析。(2) 0.1≤(L_b\L_e)<0.9，需考慮三維有限土體效應。 (3) (L_b\L_e)≥0.9，有限土體效應可充分發揮。本研究建立了一個新參數∝及簡易公式來量化三維有限土體效應。最後，根據本研究訂定之三維效應影響範圍及量化公式建立二種方法精進有限土體一維簡化分析法，提供使用者在使用一維簡化分析法也能考量三維有限土體效應。

Based on an actual excavation case, the PLAXIS 3D program is used to study the three-dimensional finite soil effects caused by the excavation. The analysis results show that the adjacent building side will indeed exhibit the finite soil effects during the excavation. Both the two-dimensional analysis and the field monitoring results show the same trends. Then, based on this verified 3D model and parameters of the actual case, a series of hypothetical cases are developed and analyzed. Analytical results show that the finite soil effects become more and more significant as the length of the adjacent building increases. When the length of the adjacent building increases to about 0.9 times as the excavation width, the finite soil effect is almost fully mobilized.
In order to evaluate the influence area of the three-dimensional finite soil effect, this study uses the hyperbolic model to regress the analysis results of the hypothetical case study and quantifies the influence area by the method of Tangent Intersection. The studying results indicates: (1) Ratio of the adjacent building length (L_b\L_e) <0.1, behave as the free field and no need to consider the finite soil effect. (2) 0.1≤ (L_b\L_e) <0.9, need to consider the three-dimensional finite soil effects. (3) (L_b\L_e) ≥0.9, fully mobilize the finite soil effect. This research defined a new parameter ∝ and derived a simple formula to quantify the three-dimensional limited soil effects. Lastly, this research proposed two methods to improve the one-dimensional simplified analysis method, the users are now able to consider the three-dimensional limited soil effects while doing the one-dimensional simplified analysis.

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