Study On Bearing Deformation Behavior Of Inclined Pile Under Horizontal Cyclic Loading

As a common basic form in wind power generation engineering,transmission tower engineering,offshore drilling platform and tidal power generation project,oblique pile foundation has good bearing capacity and can meet the requirements of bearing capacity and deformation under vertical load and horizontal load.However,the research on bearing deformation behavior of oblique pile under horizontal cyclic loading is less,and the horizontal cyclic load makes the inclined pile have accumulative deformation and residual stress,and the strength of the soil will change.Taking the single pile foundation of transmission tower project as the main research object,this paper studies the bearing deformation behavior of oblique pile under cyclic pile top horizontal cyclic load,and provides basis for relevant practical engineering design by model test and numerical analysis.(1)The indoor model test is carried out by applying one-way horizontal cyclic loading at the top of the inclined pile.The influence of the inclination of the pile,the amplitude of cyclic load and other factors on the horizontal displacement,the horizontal ultimate bearing capacity,the bending moment distribution,the axial force distribution,the shear distribution and the average frictional resistance distribution of the pile in the sand face are studied.The variation of the horizontal displacement,the bending moment and the shear distribution of the pile in the sand surface with the cycle times are discussed.The results show that: the deformation performance of the inclined pile under the horizontal cyclic load is better than that of the negative oblique pile;With the increase of the water calm load,the effect of cyclic load on the internal force of the oblique pile is less and less.At the same time,the horizontal ultimate bearing capacity of the inclined pile is greater than that of the negative(2)The bearing deformation behavior of oblique pile under bidirectional horizontal cyclic loading is studied by finite element software Abaqus.The influence of pile inclination and cyclic load amplitude on horizontal displacement of pile body,horizontal displacement of pile body,moment distribution of pile and shear force distribution are analyzed.The results show that the cumulative displacement increase in the first 20 cycles is large,and the cumulative displacement increment is close to zero after 20 cycles,effect of bidirectional cyclic loading on the horizontal ultimate bearing capacity of negative oblique piles,the maximum of the horizontal displacement of the pile appears at the top of the pile,and the cycle times have no effect on the relative depth of the bending moment and the maximum shear strength.