Study On The Influence Of The Disk Diameter On The Failure State Of The Soil Surrounding The Extended-plate Pile Under Horizontal Force

At present,some results about the theoretical and experimental study on the horizontal bearing capacity of the concrete plate-expanded pile has achieved,but it is still in the initial stage.Analyzing the current research status,there are still some problems in the study on the concrete plates-expanded pile in the horizontal force.First of all,soil surrounding the concrete plate-expanded pile stress situation changed greatly,therefore,it is unreasonable to calculate the ultimate anti-overturning bearing capacity of concrete slab pile by reference to ordinary straight hole pile.Secondly,In the existing studies,the study almost focus on the failure of the pile itself,and the influence of the failure of the soil on the bearing capacity is neglected.Thirdly,the main influencing factors of bearing capacity of single pile are as follows: the diameter,spacing,position,slope and quantity of bearing capacity are just qualitative analysis and lack reliable theoretical basis.So further research on each influencing factor and soil failure states need to be made,and it will provide a more reliable basis for the development of the expanded-plate pile.In this paper,we study the influencing factors of disk diameter of the bearing plate,and through theoretical analysis and small scale model test,we can deeply study the effect of disk diameter on the horizontal bearing capacity of concrete plate-expanded pile and the soil failure state.The finite element simulation software of ANSYS was used to analyze the plate-expended pile-soil model with different disk diameter.Then the displacement and stress results of the plates-expanded pile and soil were compared and analyzed.The pile-soil model size of small scale model test is based on the theoretical analysis,determined by according to 1:30 shrink.Theload and displacement data are recorded at any time during the test and the pile-soil interaction is recorded with the camera.Finally,compared with the analysis theory and experimental results,it is clear that the interaction mechanism between pile and soil under the action of horizontal force is obtained,and the optimal ratio of diameter and pile diameter is obtained.Under the premise of soil failure,the horizontal ultimate bearing capacity calculation model of concrete plates-expanded pile is put forward for the first time.Focus and innovation of this paper is to test methods,test methods is still using undisturbed soil visual test device.As the general building(structure)is usually in the vertical force and horizontal force in the common environment,so on the basis of the original vertical force loading device,after repeated scrutiny,testing,improvement,this realizes vertical and horizontal forces applied simultaneously in this test.At the same time,on the basis of the existing test,doing further improvement on the excavator and the method to strive to obtain a more complete part of the original soil test block.As the test process is visible,we can observe the whole process of the failure state of soil surrounding the pile,which makes up the blank of the study on the soil.In this paper,the results of the study on the influence of the disk diameter on the horizontal bearing capacity of the concrete plate-expanded pile and failure state of the soil will improve the design theory of the plate-expanded pile and enrich the horizontal bearing capacity calculation method of the plate-expanded pile.And it played a great role in promoting the application of concrete plate-expanded pile in building(structure)with horizontal force.At the same time,the improvement and innovation of the test method provide a reference for the research and development of the pile foundation.