Efficiency Analysis of Cross Wall Supporting Diaphragm

• Main Author: 洪廷瑋
• Other Authors: Shong-Loong Chen
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/mh4536

碩士 === 國立臺北科技大學 === 土木與防災研究所 === 97 === The cost of land acquisition, amongst other factors, is always an important issue in urban areas. For more effective use of land, deep excavation is one of the options for substructures. However, the geological formation of Taipei Basin features mostly soft and weak clay. In K1 area, clay of soft and weak natures extends deep into underground formation, and the creep induced by soft clay creates profound impacts to excavations. For retaining structures during excavation, in addition to the main body of diaphragm wall, cross walls provide counter-balance of lateral soil pressure between both sides of excavation, keeping lateral displacement from forming in the diaphragm wall. PLAXIS 3D FOUNDATION, a 3-dimenstional analysis program using finite element method, was adopted in combination of creep model in soft soil in this study for analysis. With cross walls as study subject, monitoring data and analysis result were used to investigate the set-up of cross walls in excavation for effective suppression of lateral displacement in diaphragm wall. Also, a simulation of soft soil creep analysis with the verification of monitoring data was proposed for reduction of analysis time in 3D program.