Research on the Mechanics of Large-diameter Pile-wall Composite Anchorage Foundation based on Numerical Simulation
In this paper,an innovative large-diameter pile-wall combined no-excavation anchorage foundation is adopted for the bridge anchorage design.Compared with the traditional composite anchorage foundation,this new foundation design can improve the stability and durability of the foundation,while reducing the impact on the surrounding environment.In order to clarify the force mechanism and foundation advantages of large-diameter pile-wall combined anchorage foundation,in the paper,relying on the Cangrong Xunjiang Bridge project,according to the structural arrangement,type and size of large-diameter pile-wall composite non-excavation anchorages provided by the design department,PLAXIS 3D is used to model the anchorages of Xunjiang Bridge,the bearing capacity and soil failure mode of pile group and pile wall combination foundation under vertical and horizontal loads are compared and analyzed.Meanwhile,in order to well understand the influence of pile diameter and arrangement on the stress performance of large diameter pile-wall combination composite anchorage foundation,sensitivity analysis is carried out in this study to evaluate their specific influence on the bearing capacity of pile-wall combination foundation.The results of this study show that under vertical loading,the failure of the pile-wall combination foundation is mainly caused by pile-soil detachment,while under horizontal loading,the failure surface develops continuously to the surface along the bottom of the structure and in a plane at 30° to the vertical direction,forming a triangular soil wedge.The increase of pile diameter has improved both vertical and horizontal bearing capacity of foundation,while the horizontal and vertical bearing capacity of foundation with horizontal arrangement is better.The results of this study provide an important theoretical basis for the design of pile-wall combination anchorage structures.
bridge engineeringCangrong Xunjiang Bridgepile-wall combined anchoragenumerical simulationbearing capacity3D model
万方数据
维普
