Study on Compression Bearing Characteristics of Multi-blade Helical Pile in Sandy Stratum
In order to analyze the compression bearing characteristics of helical pile in sandy stratum,the method calculating vertical compression bearing capacity of multi-blade helical pile was introduced.Finite element software was used to analyze the pile top settlement response of the double-blade helical pile under vertical compression load in sandy stratum and verify the reliability of the finite element model established.Nine groups of multi-blade helical pile models in different blade spacing were set to analyze the distribution of the axial force of the pile and the shear strain in the soil around the pile,as well as the load sharing mode.The results of the finite element analysis and the bearing capacity calculated theoretically were compared,and then the calculation formula for bearing capacity corrected by blade bearing capacity reduction factor was introduced.The result shows that,the bearing mode of multi-blade helical pile is determined by blade spacing,and the ratio of blade spacing equal to 2 is the point dividing individual bearing mode and cylindrical shearing mode;after the blade bearing capacity reduction factor is introduced,with the theoretical calculation,the ultimate bearing capacity of multi-blade helical pile may be predicted accurately.
sandhelical pileverificationfinite element methodbearing mechanismultimate bearing capacity
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