Mechanical Response of a Novel “Anti-slide Pile + Support Column” Composite Retaining Structure

Abstract

Owing to the frequent fluctuation of river water level and the stability control of bedding rock slope under high loading force of slope crest, the traditional slope stability control technology can hardly achieve the desired effect given its limitations. This study proposed a novel "anti-slide pile + supporting column" composite retaining structure to improve the stability of slope under this condition. The mechanical response characteristics of the composite retaining structure under the sliding force of the slope were studied through structural mechanics and finite element analyses. The difference in the internal force calculation results obtained through various methods was compared and analyzed, and the reliability of the calculation results was verified. Results show that the supporting column bears a significant axial pressure under the sliding force of the slope. Relative error is up to 85% between the internal force of the retaining structure obtained through displacement method without considering the axial deformation and the results obtained through other solving methods. The axial force of the supporting column is uniformly distributed along the column, and the bending moment and shear force of the column are relatively minimal. The axial force at the intersecting position between the anti-slide pile and the supporting column is the largest, and the maximum bending moment occurs at the part of the column near the embedded section. The shear forces at the contact position between the anti-slide pile and the supporting column and the part of the anti-slide pile near the embedded segment are relatively large. This study provides references for slope treatment engineering under similar conditions.