Research On The Performance Of I-shaped Pile Under Horizontal Load

With the development of civil engineering,pile foundation has become one of the most widely used basic forms in engineering.Under the impetus of engineering construction,new types of piles,pile materials and construction techniques continue to emerge.Experts and scholars have developed many special-shaped piles on the basis of traditional square piles and round piles.Because of its high bearing capacity and low engineering cost,shaped piles have become the main development direction of pile foundations.I-shaped pile is a new type of special-shaped pile,with a large specific surface area,high vertical bearing capacity,saving materials and other advantages.At present,the study of I-shaped piles mainly focuses on the working characteristics of piles under vertical loads,but there are few studies on the working performance of piles under horizontal loads.In this paper,the indoor scale model test,ABAQUS finite element analysis and theoretical analysis are used to study the bearing performance of I-shaped single pile and pile groups under horizontal loads.The main contents are as follows:(1)Through the indoor scale model test,the distribution law of horizontal load capacity,displacement and bending moment of I-shaped single pile under horizontal load was analyzed.The results show that the I-shaped pile is 68% larger than the vertical load in the direction of the vertical flange,and the ultimate load is 36%.Under the same load,the vertical flange direction is smaller than the horizontal displacement in the direction of the vertical web.The bending moment of the pile is mainly distributed within 60% of the upper part of the pile,and the bending moment of the lower part of the pile is less affected.(2)Using ABAQUS finite element software simulation,the mechanical behaviors of model piles and test piles under the same working conditions were compared to verify the reliability of the finite element calculation method.Based on this,the theoretical calculation results of the m method and the analysis results of the model piles were compared and analyzed.Investigate the value of the calculated width of the section of the pile,and propose the calculation formula for the horizontal bearing capacity of the I-shaped single pile.(3)The finite element group analysis method was used to create the I-shaped pile groups model under horizontal loads.The effect of pile spacing and pile depth on group piles effect was analyzed.The results show that with the increase of the pile spacing,the horizontal displacement of the center of the pile gradually decreases,and the comprehensive coefficient of the pile groups effect increases continuously,and the percentage of the increase of the pile groups decreases as a whole.With the change of the flat position of the soil surface between the top surface of the platform,the bottom surface of the platform,and the bottom surface of the platform,the horizontal displacement of the platform center gradually increases,and the overall coefficient of the pile group effect gradually decreases.(4)The horizontal bearing capacity of I-shaped pile groups includes the bearing capacity of piles and piles,the soil resistance on the side of pile caps and the friction force on the bottom of pile caps.According to the influence of pile spacing and pile depth on pile groups,the horizontal load of pile groups is proposed Force calculation formula.