深開挖工程施工時會造成地盤的位移，此位移又可分為沉陷(垂直向)及側向位移(水平向)，皆會對鄰近建築物造成影響。一般針對此類影響之分析大都採用自由場(greenfield)模式，以地表沉陷值作為鄰近建築物之沉陷值，此方法亦為國內一般設計分析時所採用。但建築物之基礎通常放置於地表下某一深度，針對埋置於地表下之基礎沉陷量及角變量 若僅以地表沉陷行為進行預測分析恐怕並不適當。除此之外，進行建物之安全評估時應考慮地盤側向位移造成的影響，也就是應該同時考量角變量以及側向應變 對鄰房造成之影響。有鑑於此，本研究之目的在於建立能夠合理預測地盤移動之簡化方法，分別對地盤沉陷及地盤側向位移之預測提出建議，並以自由場(greenfield)地盤反應來預測開挖引致鄰近獨立基礎建物之損害潛能。研究結果顯示，根據144組假設案例與台北國家企業中心之數值分析所建立的地盤位移預測法，能夠合理的預測地表下之地盤移動；針對鄰近開挖區之獨立基礎建物的損害評估，亦能得到相當合理之結果。

Most of design consultants in Taiwan use the greenfield condition to evaluate the damage potential of buildings affected by excavation. The ground surface settlement obtained from the greenfield condition is adopted as the building’s settlement. However, building foundations are generally constructed at certain depths rather than at the ground surface. Therefore, calculating a building’s settlement and an angular distortion with only considering the ground surface behavior is inadvisable. In addition, it is more rigorous to consider the angular distortion and the horizontal strain simultaneously for the evaluation building safety. The purpose of this study is to establish a simplified method for the prediction of ground movement, and the assessment of the damage potential of buildings adjacent to a braced excavation by the greenfield condition analyses. Based on the 144 sets of hypothetical cases and a well-documented deep excavation case namely, the Taipei National Enterprise Center (TNEC) excavation, the methods to predict the ground settlement and the lateral ground movement profiles at various depths were developed. The results showed that the proposed methods could predict the ground settlement and lateral ground movement profiles with a good accuracy. The proposed method also provided good results for evaluating the damage potential of buildings with spread footings adjacent to the excavation.

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