| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程系 === 104 === For diminishing the influence of swelling during saturation in the triaxial test, the difference between cell pressure and back pressure should be equal to the residual effective stress of soil sample. According to the literatures, the stiffness of soil reduced if the swelling during saturation occurred. In order to ascertain more realistic soil parameters, the K0 consolidated undrained triaxial compression and extension (CK0U_AC, CK0U_AE) test with three unloading-reloading steps were performed. One set of test consist of three different vertical consolidation stress (σ'vc). In this study, the normalized undrained shear strength and stiffness parameters of normally consolidated Taipei silty clay were investigated such as Su/σ'vc, Eui/σ'vc, Eu50/σ'vc, Eur/σ'vc, Eui/Su, Eu50/Su and Eur/Su. The experimental results of CK0U_AC and CK0U_AE showed the value of Eui/σ'vc was close to each other with range from 527 to 572. The value of Eur/σ'vc of CK0U_AC and CK0U_AE was also similar when the stress level was almost the same. Thus, the Eur seemed that has the normalized beha-vior to σ'vc. The average of Eui/Su and Eur/Su on the CK0U_AC test were 1816 and 281 respectively.
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