過去多以經驗公式計算土壤楊氏模數，其中經驗公式皆由土壤基本性質參數組成。然而，土壤基本性質參數係由現地鑽探取樣後，經由室內試驗所得到之參數。但土壤於鑽探取樣時，常受到擾動地影響，導致試驗結果準確度降低，因此必須收集許多鑽孔資料進行判斷。本研究使用PLAXIS中之Soil test進行土壤參數的優化，再與經驗公式計算的土壤楊氏模數比較，以便於日後快速地求取土壤楊氏模數。再者，本研究考慮土壤小應變行為，使用了PLAXIS中之HSS model。由於HSS model須額外輸入小應變參數，如初始剪力模數(G0^ref)及初始剪力模數衰退至70%時所對應之剪應變(γ0.7)。首先，針對HSS model進行一系列的參數研究。最後，對G0^ref和γ0.7做出合理的假設，並提出預測深開挖變形的方法。結果透過五個座落於軟弱黏土中之深開挖案例得到驗證。

In the past, empirical formulas were commonly used to calculate the soil stiffness parameters, which are based on the basic soil properties. However, the parameters of basic soil properties obtained by the laboratory tests after sampling may not be able to represent actual conditions because soil samples from boring are often disturbed. In this study, Soil test in PLAXIS was performed to optimize the soil parameters and then compares them with the soil stiffness parameters calculated by empirical formulae, which could obtain the soil stiffness parameters more quickly and accurately. Furthermore, the hardening soil small-strain (HSS) model in PLAXIS was adopted for the deep excavation analysis, which could consider a small-strain behavior of soil. Compared with the HS model, the HSS model requires additional two parameters, such as initial shear modulus (G0^ref) and the shear strain level at which the shear modulus is reduced to about 70% of initial shear modulus (γ0.7). A series of parametric studies were initially conducted to study the characteristics of the HSS model. Finally, a reasonable estimation of the G0^ref and γ0.7 was proposed to predict the deformation in deep excavations. The results were validated by five excavation case histories in soft clay.

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