Analysis And Study On The Uplift Damage Mode Of Transmission Tower Enlarged-bottom Pile

The foundation of anti-pull pile is widely used because of its high load capacity,high performance and high construction speed,Its application fields include high-rise building,overhead transmission line,offshore oil drilling platform,underground building,bridge engineering and so on.However,the damage mode of the enlarged-bottom pile and its boundary scope range with soil quality conditions can not be determined in the design of the foundation of the anti-pull pile in uhv transmission lines,It's confusing for the designer,Therefore,it needs to be further studied in theoretical terms.In this paper,the damage mode and its boundary scope of enlarged-bottom pile under different engineering Geological conditions are analyzed and studied by combining theoretical analysis and numerical simulation.Using finite element software ABAQUS to establish a three-dimensional finite element analysis model of pile-soil interaction,having a depth discussed on,the damage mode of the enlarged-bottom pile under the uplift load,The factors influencing the damage mode of the reinforced pile are analyzed.Based on the theoretical analysis and numerical analysis,it is found that the second damage mode of short pile except for short pile damage mode and long pile damage mode,and the corresponding boundary scope range of the damage mode of anti-pile under different soil conditions is determined.The formula for calculating the ultimate anti-pull load capacity under the second damage mode of pile with extended bottom is derived.