Experimental Research On Lateral Dynamic Response And P-Y Curves Regularity Of Symmetrical Double Inclined Pile

The research on the horizontal bearing capacity of pile foundation under seismic action is one of the important subjects in the field of geotechnical engineering.The oblique pile foundation is mainly set in the form of symmetry and bear the lateral force,the seismic performance of the batter piles is also particularly important.This article focuses on the lateral dynamic response of the symmetric double inclined pile in liquefied soil and non-liquefied soil.The main contents include: Do the different peak acceleration of sine wave and seismic wave input of the symmetric double straight pile with double inclined pile shaking table test.Through analyzing the results of the test to summarize the lateral dynamic response characteristics of pile cap,then dealing with the stain of pile body and soil displacement to study the dynamic p-y hysteresis curves of pile body under different operating conditions.First of all,carrying out the symmetrical double pile model experiment by electromagnetic table,the performance of the vibration table was studied before testing,familiar with the operating system and data acquisition system for test acquisition system and selecting the reasonable theory foundation of experimental design.Secondly,Using the appropriate size of the shear box,in accordance with the similarity design to produce two symmetrical double-pile model,the two models of non-liquefied soil and saturated sandy soil were selected,the rules of the sine wave and the seismic waveform were entered on the Mesa,the deformation of pile body and soil was measured by FBG,and the acceleration and displacement time history of pile cap was recorded in the experiment.Then,the experimental vibration data are compared and analyzed.The symmetric double cap pile head acceleration and displacement time history and the corresponding operating table input acceleration and displacement were compared.The comparative study concluded that: in non-liquefaction test,the two kinds of pile caps was amplified than table input,two level matched;in liquefaction test,the cap acceleration and displacement of cushion cap was more obvious than table input amplification effect,And the symmetric double straight pile amplification effect was bigger than the symmetric double inclined pile.Finally,the p-y curves of symmetric double straight piles and symmetric double inclined piles under different test conditions were analyzed.Under the sine wave input,the lateral force and the displacement of the straight pile and double symmetric double inclined pile increased with the increase of the acceleration peak,the area of p-y hysteresis curve increases;when in the non-liquefied soil,the symmetric double inclined pile and double straight pile hysteresis curve area is similar under the same peak acceleration input,however,when in the liquefied soil,the area of the hysteresis curve of the symmetrical double inclined pile is greater than the symmetric double straight pile.Under the seismic wave input,hysteretic curve is anomaly,extreme lateral force and displacement are appeared on the acceleration peak;State of saturated sandy soil lateral force and displacement were greater than dry sand state,and the lateral force and displacement of symmetrical double inclined pile were greater than the symmetric double straight pile.