Model Test Study On Anti-uplift Pile With Enlarged Bottom Under Inclined Load

The anti-pulling pile bearing inclined load often exists in engineering,but there are few research results at present,Paper under inclined load of uplift pile model test research,laboratory test and numerical simulation method,it is proposed to enlarge bottom uplift pile under inclined load test and research,to explore the inclined Angle of load and load size of pile body displacement,the influence of uplift pile bearing capacity,the analysis of the effect of expanding head of section for the pile body displacement,for further study of expanding bottom uplift pile under inclined load engineering characteristics has theoretical significance and practical value.Was studied by conducting model test,the expanded head diameter,the Angle of the inclined load equivalent diameter piles with enlarged bottom uplift pull-out bearing characteristics of pile and the influence of pile body displacement,concluded:expanding presence makes the ultimate uplift bearing capacity of pile head,and within a certain range,expand the head diameter increases,ultimate bearing capacity of pile will increase;When the pile with the same diameter and the pile with enlarged bottom is subjected to inclined load,the ultimate bearing capacity decreases first and then increases as the Angle of inclined load increases.The lifting effect of enlarged head section on ultimate bearing capacity of pile is almost zero when the pile with enlarged bottom is subjected to large angular tilt load.The enlarged head can reduce the vertical displacement,but the enlarged head has no obvious effect on the reduction of the horizontal displacement caused by the horizontal component.The resistance strain gauge was used to measure the pile strain.The data showed that under the inclined load,one side of the pile was always under pressure,while the other side was always under tension.The pile strain would increase with the increase of the Angle of the inclined load.The enlarged head of expanding bottom pile has a significant effect on reducing the strain at the bottom of pile.FLAC3D numerical software was applied to the numerical simulation of the model pile.The analysis showed that the numerical simulation was consistent with the test results,which proved the reliability of the test and verified the correctness of the numerical calculation.The horizontal displacement of the bottom enlarged pile is the largest at the buried depth of zero,and the relationship between the horizontal displacement and the buried depth has a cut-off point.The horizontal displacement of the pile body above the cut-off point presents a linear relationship with the buried depth.