Study on Mechanical Effect of Composite Enclosure Structure of Open Cut Subway Station in Deep Backfill Area with Water-Rich Soil and Rock

In order to study the mechanical characteristics of soil-stone mixture (SRM) in water-rich soil-stone deep backfill area and the mechanical effect of deep foundation pit composite enclosure structure, based on the construction practice of open cut subway station in water-rich soil-stone deep backfill area, based on the particle size analysis of soil-stone mixture and large triaxial consolidation and drainage test, we investigate the effect of different enclosure pressure on the mechanical characteristics of soil-stone mixture in water-rich backfill area, and obtain the c, φ values; based on the elastic foundation beam theory and the bending stiffness equivalence method of pit enclosure structure, the deformation and force characteristics of the composite enclosure structure during construction are analyzed to provide reference for design and construction.