Study On The Influence Of Overhanging Diameter On Flexible Concrete Expanded-plate Pile Under Horizontal Force

As a new type of variable cross-section cast-in-place pile with excellent performance,Concrete Expanded-plate pile have gradually played their unique advantages in various engineering fields in recent years and have a good development prospect.At present,certain results have been achieved in the research on Concrete Expanded-plate piles under vertical load,but there are still some problems in the research under horizontal loads,mainly including the following aspects: First,the past about the horizontal bearing of Concrete Expanded-plate piles In the study of force influencing factors,the model piles are regarded as rigid bodies.When the pile diameter is small,the bending deformation of the Concrete Expanded-plate pile under horizontal load is not considered;secondly,in the existing Concrete Expansion plate In the study of the ultimate bearing capacity of piles,more researches are on the bearing performance of the pile itself,and the influence of the damage state of the soil around the pile on the bearing capacity is not considered.Finally,the current limit for the ultimate resistance of a single pile of Concrete Expanded-plate pile is The calculation method of overturning bearing capacity is not reasonable enough,and there is no sufficient theoretical basis for the research on the various parameters of the bearing plate of flexible Concrete Expanded-plate pile.Therefore,it is necessary to compare the parameters of the bearing plate of flexible Concrete Expanded-plate pile under horizontal load.In-depth study of the correlation of soil damage state.In order to better improve the calculation model of the horizontal bearing capacity of the Concrete Expanded-plate pile,this paper introduces the concept of the plate cantilever diameter as the main research object,which is different from the concept of the plate diameter in previous studies,and the pile diameter and the plate cantilever diameter are more detailed In order to study the influence of the horizontal load footwall cantilever diameter on the damage state and bearing capacity of the soil around the flexible Concrete Expanded pile pile,the flexible Concrete Expanded pile means that when the pile diameter is not large,the horizontal load continues Under the action,the horizontal displacement of the pile top continues to increase,which causes the pile body to generate bending deformation and accumulation of the Concrete Expanded pile pile,which is different from the rigid or semi-rigid pile which is mainly overturned.In this thesis,a combination of simulation analysis and small-scale model test of the undisturbed soil is used to study the influence of the horizontal load bottom wall cantilever diameter on the soil damage state and the anti-overturning ability of the flexible Concrete Expanded disk pile.In the simulation analysis part,through the ANSYS finite element simulation software,the pile-soil force mechanism and failure law are initially obtained,and the reasonable range of the cantilever diameter and the pile diameter is obtained;the load and displacement data are recorded at any time during the test,and used The camera records the changes in the pile body and the damage state of the soil around the pile during the test;the results of simulation and test are compared and analyzed,and it is concluded that the larger the overhang diameter of the plate is,the greater the horizontal bearing capacity of the Concrete Expanded plate pile is The stronger,but this increasing trend does not increase proportionally.Combining comprehensive consideration of economic benefits and horizontal bearing capacity,it is concluded that there is an optimal ratio between the cantilever diameter of the pan and the diameter of the pile.According to the research team,the single pile has been obtained.The results of the horizontal ultimate bearing capacity calculation model have improved the calculation model of the horizontal ultimate bearing capacity of Concrete Expanded pile.In this thesis,through the research on the damage state and anti-overturning ability of the soil around the flexible Concrete Expanded pile pile by the cantilever diameter of the lower wall under the horizontal load,the design theory of the Concrete Expanded pile pile is improved,and it is the design and The popularization and application has laid a solid theoretical foundation.