在深開挖研究中，黏土層對於工程的影響一直被視為重要課題之一，然而過去台灣的深開挖工程研究大多以大台北地區黏土層為背景，鮮少有針對高雄地區黏土層中之深開挖進行探討，然而隨著近年來高雄地區之發展，都市內的開發區域也漸漸向外擴增，含有較厚黏土層的深開挖工址也較常出現了，故本研究選擇一位於高雄市鳳山區之開挖作為研究案例，其開挖區內包含6公尺深黏土層，使用ABAQUS有限元素軟體作為分析工具，並以不同土壤模型與網格密度設定進行模擬分析，再與現地監測資料作比較。
研究結果顯示，以莫爾-庫倫模式(Mohr-Coulomb Model，MC)分析砂土層，並以Es1=2800N作為所有砂土層之彈性模數時，由於土壤勁度參數於數值模擬輸入為固定值，無法如土壤實際行為一般，依土壤應變大小而改變，可能導致較深度砂土層之土壤勁度被低估，使壁體變位分析過大，無法符合現地觀測情形。而黏土層改以修正劍橋模式(Modified Cam-Clay Model，MCC)作模擬時，由於本案例之開挖深度較淺，黏土未達到其降伏強度，故無法從數值模擬結果，顯現MCC模式於模擬黏土層之壁體變形時之優勢。此外，網格的不同假設，並未造成分析結果的明顯差異。

Impacts on engineering performances of deep excavations in clay indeed attract attentions. However, deep excavations in Taipei clay are mainly selected as the background in previous researches but not for Kaohsiung. However, due to the development of the city, more and more cases in Kaohsiung were found that excavations have to be conducted in clay too. Therefore, an excavation delivered in 6-m thick clay in Kaohsiung is selected for this study and the objective of this study is first to evaluate the performance of two constitutive models, Mohr - Coulomb model and Modified Cam-Clay model, for examing wall displacements induced by deep excavation in Kaohsiung clay. In addition, the effect of different grid density setting would be considered in this study. Then a three-dimensional finite element (FE) analysis is conducted. FE analysis results indicate that the use of the Mohr - Coulomb model with Es1=2800N in all sand layers cannot predict good wall defections It is likely that both models have constant soil stiffness, can’t have strain- dependent stiffness which is inconsistent with reality of the soil. It is anticipated to be the reason leading to the difference. The Modified Cam-Clay model which use to simulate the clay layers cannot perform better. Due to the shallow excavation depth of this case, the soil deformation is limited so the clay did not yield yet. The difference caused by different definition of yielding condition of two models thus can’t be seen. Furthermore, different assumptions of the grid do not cause significant differences in the analysis results.

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