The Effect of Three Dimensional Configurations on the Diaphragm Wall Displacements Due to Deep Excavation
Date Issued
2016
Date
2016
Author(s)
Chang, Chih-Po
Abstract
Diaphragm walls are often used to resist lateral earth pressure and prevent excess ground settlement and wall movements during excavations. There are several practical methods for diaphragm wall design, based on the assumption of plane strain condition. This assumption is valid for shallow and wide excavations, with L/He value greater than 6 (L: length of diaphragm wall, He: depth of excavation). Due to limited available space in urban area, lots of excavations are small but deep in Taiwan. Without considering the three dimensional effects, it leads to an over conservative design for the diaphragm wall. To develop an economical method for diaphragm wall design with consideration of three dimensional effect, the finite element software “Plaxis” was used to examine the maximum wall deflection in various combinations of thickness of wall, average vertical and horizontal spacing of struts, length and width of excavation, and maximum ground water head difference. From the simulation results, the new system stiffness was proposed. As the current study focuses on the excavations in sand, case histories excavated mainly in the sandy layer were selected to verify the applicability of the proposed system stiffness. It was concluded that the proposed system stiffness can quantify the wall stiffness more precisely with consideration of the three dimensional effects, especially in the condition of high system stiffness.
Subjects
sand
excavation
three dimensional effect
Type
thesis
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