過去對於大地工程問題的數值分析，在輸入參數的決定上缺少一個實用的參考依據，而工程上對於實際案例的分析，為求簡化問題，參數的決定亦往往過於粗糙。因此，本研究的主要研究目的在於彙整並評估土壤及岩石各項參數的經驗公式及建議值，並討論其對於一般大地工程問題方面的數值分析的影響，期能透過一個簡易求得輸入參數的系統，以有效模擬現地發生的工程問題及災害情形。

　　本研究首先針對各項參數就以往文獻的經驗資料作一彙整的工作，此工作著重於土壤強度參數的經驗公式(楊氏模數、剪力模數)，所有的經驗資料依不同的試驗種類及適用土壤型態作區分，並提供初步使用的建議。另外，本研究亦藉由三軸試驗結果，來討論粒狀土壤的膨脹行為對於工程問題的影響。

為針對上述彙整及試驗的工作結果做一評估，本研究運用PLAXIS有限元素分析方法，進行三個實際案例分析，包括邊坡、深開挖及碼頭的工程行為分析；數值模擬的結果顯示，與實際上工程常用的分析方法及常用的應用軟體比較，本研究所建議選取適當的土層經驗公式可以得到較佳的分析結果。

This research was an effort to evaluate the influence of empirical soil properties in geotechnical analysis. Empirical equations and suggested values from previous literatures were synthesized. The main purpose of this task focused on the strength properties like Young’s modulus and shear modulus of soils and rocks. All empirical data were synthesized according to different field and laboratory tests and various soil types. Recommendations based on the experience of the synthesis work were outlined for preliminary determination of appropriate empirical parameters.

Dilative behavior of granular was seldom considered in engineering practice. Besides, less research were carried out to investigate dilation angle of granular soils at low confining pressure range. Therefore, in this research, triaxial tests were performed on several types of sand in Taiwan. Test results were obtained to compare with previous research. Suggested values of dilation angle of different granular soils based on analysis results were then indicated.

Three in situ cases were introduced to evaluate empirical soil information described above. A finite element method based computer program PLAXIS were also applied to case studies. Compared to general engineering analysis methods, this research performed better analysis results with the consideration of appropriate empirical soil properties. Recommendations were also established for further seismic analysis.

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