Three Dimensional Numerical Analysis of Circular Foundation Excavation

• Main Authors: Tu Chung-Yen, 杜重諺
• Other Authors: 陳水龍
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/2c9q6m

碩士 === 國立臺北科技大學 === 土木工程系土木與防災碩士班 === 104 === Case with a diameter of 93.5m (radius D = 46.75m) of the circular diaphragm wall as retaining measures (divided into 60 units of about 4.8 ~ 4.9m), due consideration the continuous wall to complete the circle closed, can effectively turn moment pressure into the shaft, so without excavation reinforced with inner support. But also because there was no reason within the middle column of the support and at the time of excavation is also significantly reduced the difficulty of its construction. In this study, using the numerical simulation software PLAXIS 3D finite element as (FEM) analysis. After the first recorded the stratigraphic distribution site before formation of the engineering characteristics, construction procedures and monitoring information. PLAXIS 3D simulates excavation process, which includes: different model simulations (Mohr—Coulomb, Hardening Soil model), and so for comparison to analyze the data can meet the on-site monitoring data, and using feedback analysis showed that changes in soil at the time. After analyzing PLAXIS 3D and field monitoring and PLAXIS 2D for comparison, and using feedback analysis showed that changes in soil at the time, and then compare discussed. The research finds the trend of the diaphragm wall’s displacements is similar but the 3D’s displacements is smaller than 2D’s displacements, and both comply the trend of monitoring data.