Abstract
A special double-row support structure used for braced excavation was modeled numerically using finite element method. The performance of the braced excavation depends on the interaction between the two walls of the support structure. Comprehensive parametric studies were carried out to investigate the influence factors on the performance. It was ascertained that the support structure behavior was largely influenced by overlapping length of two support walls, embedment ratio of inner support wall and spacing between two support walls. Appropriate parameters should be chosen to limit wall deflection and to maintain the stability of the support structure.
Highlights
Braced excavation has been extensively used in urban areas, and the demands for support structure are increasing due to the space limitations and environmental concerns
Large deformation is observed at the bottom of the support structure due to the low embedment depth. This will reduce substantially the base stability of the excavation. It indicates that the existence of inner support wall decreases the deflection of outer wall and increases the stability of the excavation
The increase of overlapping length is effective to reduce the deflection of the outer wall, reducing ground movement outside the excavation; but it lead to more deflection deformation of the inner wall, which decreases the stability of the inner wall
Summary
Braced excavation has been extensively used in urban areas, and the demands for support structure are increasing due to the space limitations and environmental concerns. Because the outer wall has been constructed, the design of the inner structure has a significant influence on the deflection and stability of the support structure. In view of the facts that the design of the double-row support structure is complicated due to the interaction between the outer and the inner walls, there is a need to model the excavation using a twodimensional finite element method to provide an insight to study and understand the behavior of the special structure and the interaction between the two walls. A nonlinear, two-dimensional plane strain finite element analysis was developed to study the deformation performance of the double-row support structure and the results were compared with the field observations. Based on the research findings, design recommendations were proposed for the use of the double-row support structures
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