本研究蒐集台南市地區沉積地質之深開挖案例，彙整分析鑽探及監測等相關資料，探討台南地區的地表沉陷、擋土壁體變形與開挖深度之關係，並根據Peck、Clough and O’Rourke及Hsieh and Ou等法之預測地表沉陷曲線分佈經驗公式，以評估台南地區地表沉陷曲線預測之最適性。經統計分析結果顯示，擋土壁體最大側向變形量介於開挖深度之0.05%~0.2%之間。地表沉陷曲線預測部份，Peck法所得之曲線明顯高估地表沉陷甚多，而Hsieh and Ou法所推估之最大地表沉陷量約為壁體最大側向變形量的0.20~0.75倍範圍內，且在Clough and O’Rourke法之結果明顯忽略次要影響區沉陷量，大部份所推估之最大地表沉陷量約為壁體最大側向變形量的0.35~1.0倍範圍內。

This study used data from deep excavation cases of sedimentary geology, aggregate analysis of drilling and monitoring, and other relevant data in Tainan to find the relationship between ground settlement caused by deep excavation and retaining wall deformation. According to the studies of Peck (1969), Clough and O'Rourke (1990), and Hsieh and Ou (1998), in order to successfully predict ground settlement in Tainan, it is necessary to find Tainan’s ground settlement curve distribution. Statistical analysis showed that the maximum lateral yielding ranges from 0.05% to 0.2% of the excavation depth. Ground settlement distribution curve proposed by Peck (1969) overestimated the ground settlement in Tainan, while Ou and Hsieh’s method estimated a maximum value of ground settlement that is 0.2 to 0.75 times the maximum lateral displacement value. The results of Clough and O’Rourke’s method, on the other hand, ignored the settlement of the secondary influence zone, and the maximum ground settlement value ranged from 0.35 to 1.0 times the lateral yielding value.

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