Analysis And Optimization Of Lateral Loading Capacity Of Jetty Rock-Socketed Piles

Based on the engineering practice,this paper establishes a nonlinear numerical analysis model of pile-soil based on finite element analysis method,analyzes the pile body force and pile top displacement of rock-socketed pile under lateral load,and studies the lateral bearing characteristics of rock-socketed pile.Analysis its carrying capacity,and optimize relevant parameters.,in order to provide reference for future port projects.This paper based on a large diameter rock-socketed pile pier in Zhou Shan Port,and uses the ABAQUS software to establish a three-dimensional finite element model based on a large-diameter rock-socketed pile pier in Zhou Shan Port.The field model test is used for verification analysis.On this basis,the lateral force of the pile top,the strength of the pile,the diameter of the pile,the depth of the rock,the strength of the rock foundation and the presence of the steel casing are discussed to influence the bearing capacity of the laterally loaded rock-socketed pile.According to the results of finite element calculation,the control method of the control variables is used to analyze the bending moment and stress of the pile body and the displacement of the pile top.The bearing characteristics of the rock-socketed pile under lateral force are obtained under different parameters.And the general law of the bearing of a single pile and reasonable optimization of various parameters.The analysis shows that the lateral displacement curve of the large-diameter rock-socketed pile changes very small,and there is no obvious mutation,indicating that the failure form of the pile body is progressive failure,and the lateral bearing capacity of the pile depends largely on the displacement of the pile top.As the strength of the pile increases,the displacement of the pile end gradually decreases but the extent of the decrease decreases.Therefore,the concrete marking of the pile body should not be too large to avoid unnecessary waste;the influence of the pile diameter on the lateral displacement of the pile body is very large,especially in the case of a small pile diameter.As the pile diameter increases,the lateral displacement of the pile top decreases continuously.When the rock-socket depth is greater than 9 times,the displacement of the pile top will not change,indicating that the rock-socketing depth has a critical value.Exceeding the critical value has no significant contribution to improving the bearing capacity of the rock-socketed pile.Under the premise of displacement of the dock engineering structure,the reasonable rock-socket depth obtained in this paper is about 6 times the pile diameter.The existence of the steel casing makes the displacement and bending moment of the pile body significantly reduced under the same lateral force,so the steel casing has better lateral displacement of the pile top,have good control of the overall displacement of the pile body and internal force of the pile body.In this paper,the horizontal displacement of the rock-socketed pile and the stress of the pile body under different pile diameters are analyzed.It is concluded that the pile diameter can be optimized from 2.6m to 2.4m,which can reduce the concrete content of pile foundation by more than 14%economic benefits.