Improved Calculation Method for the Internal Force of h-Type Prestressed Anchor Cable Antislide Piles

Abstract

An h-type prestressed anchor cable antislide pile is suggested for dealing with large-scale landslide disasters. At present, the internal force calculation of h-type antislide piles includes a great deal of cumbersome and complex calculus and graph multiplication processes, and the research on the action mechanism of prestressed anchor cables is insufficient. To simplify the calculation process, this study proposes an improved calculation method for the internal force and displacement of the h-type prestressed anchor cable antislide pile. A method to simplify the h-type antislide pile into a plane rigid frame calculation model is proposed, and the action of the anchor cable is added to the pile structure in the form of an unchanged tension. Then, the pile is divided into a loaded section and an anchorage section with the sliding surface as the boundary. Based on the engineering case, the results of internal force and displacement obtained through an improved calculation method, numerical simulation method, and graph multiplication method are compared and analyzed to verify the accuracy and applicability of the improved method. Finally, based on the improved calculation method, the internal force and displacement characteristics of piles are analyzed and compared under different support modes, including h-type pile, h-type with single-row anchor cable, and h-type with double-row anchor cables, and the support characteristics of the h-type prestressed anchor cable antislide pile are investigated. The results show that the tension of the anchor cable can effectively reduce the bending moment and displacement of piles. Compared with the h-type antislide pile, adding two prestressed anchor cables can reduce the maximum positive and negative bending moments of the front and rear piles by 14.8%, 14.5%, 9.4%, and 8.7%, respectively, and reduce the horizontal displacement of the top of the rear pile by 21.7%.