Research on Simplified Model of Uplift Pile and Its Interaction with Underground Structures
In order to accurately simulate the constraint effect of uplift piles on underground structures and explore the interaction between the two,a three-dimensional calculation model for the joint action of subway stations and uplift piles is established based on engineering examples.A comparison is made between the commonly used simplified models of uplift piles in engineering design,and the differences in force and deformation between subway stations and uplift piles are analyzed.The problems and applicable conditions of each simplified model are also discussed.The results indicate that the hinge support model exaggerates the constraint effect of the uplift pile on the structural bottom plate,and the beam element model and pile spring model can be equivalent to the same simplified simulation method.When the end of the uplift pile can be effectively embedded and the displacement of the pile end is zero,it can be approximated.For the engineering of combined anti uplift of retaining walls and uplift piles,using the anti buoyancy model may not match the actual force;the pile soil spring model can consider the interaction relationship between piles and soil,which is relatively close to engineering practice compared with other models;the distribution of buoyancy resistance between the uplift pile and the diaphragm wall is related to the spring stiffness of the uplift pile.
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