Efficiency Analysis of Buttress Walls and Cross Walls Reducing Diaphragm Wall Deflection In Excavation

• Main Authors: Wen-Fu Wu, 吳文福
• Other Authors: Shong-Loong Chen
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/5chaan

碩士 === 國立臺北科技大學 === 土木工程系土木與防災碩士班 === 105 === It is frequent to see the use of buttress walls and cross walls in deep excavations in soft ground in Taiwan recently to replace the traditional ground improvement, indicating the contribution of these excavation strutting structures to the suppression of lateral displacement in diaphragm walls, and differential settlement and bulge of construction site. However, the design specifications for buttresses and cross walls are yet to be developed. To find out how to design these structures for the optimized benefits both safely and economically, the 3D finite element analysis program, PLAXIS 3D, was introduced to investigate the effects of various conditions of buttress wall and cross wall installation (including spacing, length, penetration depth, height and buttress walls in T-shaped configuration) on the suppression on diaphragm wall displacement and ground settlement, and determine the efficiency of these installations in the case study. The results suggested that the spacing, penetration depth and length of buttress and cross walls had greater influence on the diaphragm wall displacement and ground settlement than thickness and height. A series of normalized formulae were proposed and tabulated for the design reference for the industry.