Mechanical performance and application of retaining structures doubling as permanent structures in deep excavations

Abstract

Abstract This study examines the effectiveness of the prefabricated pile-wall composite retaining structure (PW-CRS), which is a cutting-edge construction technique that combines prefabricated retaining piles with internal structural walls and is being increasingly utilized in excavation engineering projects. To comprehensively assess its performance, the research adopts a simulated loading approach, using equivalent concentrated loads to mimic the actual conditions faced by the PW-CRS. The experimental analysis highlights inclined tension failure as the predominant form of structural failure, accompanied by extensive cracking in both the pile and wall components. Additionally, the study points to slip failure of the laminated surfaces as a significant factor influencing the load-bearing capacity of the structure. The strain assessments on both concrete and reinforcement elements further enrich the findings. This investigation enhances the understanding of the structural dynamics of the prefabricated PW-CRS and offers valuable insights for its effective application in excavation engineering projects.