Summary of Research on Mechanical Properties of Prestressed Beam String Internal Support System in Foundation Pit Engineering

Abstract

With the acceleration of urbanization, the number of deep foundation pit projects is increasing, and the limitations of traditional support systems in large-span and complex environments are gradually highlighted. As a new type of support form, the prestressed beam string internal support system has been more and more widely used in foundation pit engineering due to its advantages of high stiffness, large span and strong controllability. This paper systematically reviews the development history, structural composition and working mechanism of the internal support system of prestressed beam string structure, and summarizes the mechanical performance analysis, influencing factors, engineering application cases and existing problems. By integrating the relevant research results at home and abroad, the mechanical properties of the system in terms of load transfer, deformation control and stability are revealed. The effects of prestress level, geometric parameters, material properties and other factors on its performance are discussed, and its practical application effect is analyzed in combination with typical engineering cases. Finally, in view of the shortcomings of the current research, the future research direction is proposed, which provides a reference for the further development and engineering application of the system.