Study On Dynamic Characteristics Of Squeezed Branch Pile Under Horizontal Vibration Load

As the squeezed branch pile is widely used in civil engineering structures, elevant technical regulations are designed, especially construction machinery equipment and technology are becoming ripe gradually. The superior economic and technical performance of squeezed branch pile is gradually recognized. There are many engineering examples and theoretical analysis about squeezed branch pile under horizontal static load and vertical static load, while related research of the squeezed branch pile under horizontal dynamic load is rare and there is no theoretical analysis. But in practical engineering, pile foundation is often under the horizontal vibration load. In this paper, method of experimental study and numerical simulation are used to study the level dynamic bearing capacity of squeezed branch pile.The main work accomplished and achievements are summarized as follows:Dynamic loading system device of the pile-soil dynamic loading system device is designed, including the design of model piles, soil box,load input device, realization of vertical load, the choice of acquisition instrument and testing components, the choice of load control equipment, etc. The indoor geotechnical test is finished. Run the experiment, enough test data is gathered.The test results were processed and analyzed, research shows that squeezed branch pile and the soil can form a larger stiffness of joint action system under the horizontal vibration loads. Compared with the ordinary pile, squeezed branch pile has a higher resistance to deformation, its bearing capacity and deformation characteristics influenced by the vibration load, the vibration frequency, the bearing plate location, vertical load and other factors.Use the finite element software ABAQUS to establish numerical simulation, to calculate and analyze the dynamic characteristics of squeezed branch pile under horizontal vibration load. In the finite element analysis, enrich the experiment parameters. Contrast analysis shows that the pile body parameter has important influence on the bearing capacity of squeezed branch piles. The set of bearing plate changed the pile deformation and stress state, the ability of pile body balance bending moment is improved, give full play to the performance of the material, which is a structure optimization design of pile foundation. The pile soil properties also directly affect the bearing capacity of squeezed branch pile.The results of the study provides new technical means and methods for further study about squeezed branch pile, it has important theoretical and practical significance for practical engineering design.