| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程技術研究所 === 86 === A series of true triaxial tests was carried out on the 10 x 10 x 10cm cubical soil specimen to study the yielding characteristics of remolded Taipei silty clay. Two sets of stess paths are adopted for the tests: one strats from the origin and the other starts from the K0 consolidation condition. The methods used to determine the yielding of hte soil are by the 10gp'' - vtot plot and the bilinear regression method for the former and by the p'' - vtot'' and q - εstot plots and the maxiimum curvature method for the latter. By connecting all these initial yielding points on the p'' - q stress space together, then a initial yielding envelope of effetive stress can be drawn, this yielding nvelope covers not only the axial compression loading but also the axial extension loading. The yielding points determined from both sets of stress path are close to each other. In general, the more significant the soil anisotropy (i. e., the more the stress path deviates form the p'' aixis), the easier the yielding point can be determined. Due to the anisotropic natrue of remolded Taipei silty clay, the yielding envelope is not symmetrical to the p'' axis on the p'' - q stress space. In addition, the shape of yielding envelope is alwo affected by the stress path. A smaller yielding envelope is obtained, when the set of stress paths starting from origin is used for the true triaxial test. According to the above test results, the true triaxial test has shown its suitability to study the yielding characteristics of clay.
|
|---|
