A Study of Soil Parameters Affected by Plasticity Level

• Main Authors: Yu-Ting - Tseng, 曾瑜婷
• Other Authors: Chang-Yu Ou
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/nzfpav

碩士 === 國立臺灣科技大學 === 營建工程系 === 105 === Plasticity level is inclusive of plasticity index(PI), liquid limit(LL) and plasticity limit(PL). It could indicate basic characteristics of soil and also be an important index to predict other soil parameters for engineering use. In order to establish the relationship of soil parameters and plasticity level, the research conducted included triaxial isotropic consolidation undrained compression test (CIUC) and triaxial K0 consolidation undrained compression test (CK0UC) on three specimen with different plasticity index. The specimen was composed of Taipei clay and Bentonite, and was produced using the wet undercompaction method. Different percentages of Bentonite which has a higher liquid limit than Taipei clay was mixed with Taipei clay to change the plasticity index of reconstituted soil. From the experiments results, soil failure parameters which includes undrained shear strength, effective friction angle and excess pore pressure parameter at failure have good relations with plasticity index. The use of the ratio of CK0UC and CIUC to compare different consolidation procedures would be affected by plasticity index. The ratio of normalized undrained shear strength increases when plasticity index increases which is the same as the result for the excess pore pressure parameter at failure. In contrast, the ratio of effective friction angle will decrease when plasticity index increases.