Research on the Analysis and Design Method of Bidirectional Loading Pile for Pile Supported Subgrade
Research purposes:In order to study the bidirectional loading pile working mechanism and design methods for pile supported subgrade,and determine the key factors affecting bidirectional loading pile bearing capacity with the horizontal load as well as the axial force,elasticity theory,horizontal soil arch theory,elastic foundation beam theory and finite difference method were applied in the research.An internal force deformation model was established and applied in the influences research of the horizontal foundation coefficient,the pile axial force,the boundary constraints as well as the pile length.Moreover,a design process for pile supported subgrade bidirectional loading pile was also proposed out accordingly.Research conclusions:(1)Pile supported subgrade piles were under bending and compression condition which exhibited the passive pile bearing characteristics,and internal forces and deformations accurate calculation could be obtained through the horizontal soil arch and finite difference method.(2)Bidirectional loading pile internal force and deformation through"m"method was safer,while the segmented"K"method for layered foundation would better reflect the influences of weak interlayers.(3)Pile axial force influences on the bidirectional loading pile bearing capacity was minimal,and the influences of pile axial force value and distribution could be ignored in the design.(4)Influences of pile top constraint on bidirectional loading pile bearing capacity were more significant than that of pile end constraint,and a free constraint boundary could be applied in the pile end boundary,and the pile top embedding boundary would cause a more significant concentration of pile internal force.(5)Pile length impact on bidirectional loading pile bearing capacity existed a limit,and it would be more reasonable as the pile length generally exceed the area where the pile horizontal load was relatively maximum.Moreover,the short column pile bearing situations should be avoided.(6)The research conclusion could provide theoretical support and methodological basis for bidirectional loading pile design in pile supported subgrade.
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