Surface Settlement Induced by Excavation with Consideration of Small Strain Behavior of Taipei Silty Clay

• Main Authors: Kung, Tung Chin, 龔東慶
• Other Authors: Ou, Chang Yu
• Format: Others
• Language: en_US
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/88753499258875137279

博士 === 國立臺灣科技大學 === 營建工程系 === 91 === According to the research results in the literatures, the exactitude of analyzing the soil-structure interaction problem is controlled by the small strain behavior of soils, especially the initial high stiffness and non-linear behavior. Many researches presented the research results regarding the small strain behavior of clays in the world, such as London clay, North Sea clay, Boston Blue clay and so on. Nevertheless, the small strain behavior of the Taipei silty clay, up to now, is seldom investigated. This study developed a set of triaxial test apparatus, equipped with the small strain instruments, with capability of measuring the small strain behavior of soils and then carried out a series of undrained small strain triaxial tests. The stress-strain behavior of Taipei silty clay at small strain was then studied. On the basis of the results of small strain triaxial tests, this study modified the Pseudo Plasticity model to be capable of simulating the high initial stiffness of Taipei silty clay and its degradation behavior of stiffness. Then this study performed the finite element analyses of practical excavation cases in Taipei basin. In addition, this study also adopts feasibility of the three-surface kinematic hardening soil model to predict the deformation behavior induced by excavation. Analysis results exhibited that the Modified Pseudo Plasticity model and the three-surface kinematic hardening soil model both can predict the wall displacement and the surface settlement induced by excavation under the condition of carefully choosing the adequate soil and structure parameters and of considering the simulation of rational construction sequences.