Calculation Method for Settlement of Large LNG Storage Tank Pile Plate Foundation Based on Q-s Curve
The Q-s curve of pile testing reflects the relationship between on-site pile foundation load and settlement.This article takes the pile plate foundation of a certain LNG storage tank as the background,proposes a method of using Q-s curve to calculate the deformation modulus of the soil layer at the pile end,and considers the joint action of the pile plate to solve the settlement of the pile plate foundation.This method simulates the pile foundation as a nonlinear spring,and the spring stiffness is taken from the Q-s curve.MIDAS is used for modeling and solving,and the settlement contour map,axial force and bending moment map of the raft and pile foundation required for design can be obtained,which can be used to guide the design.Compared with the standard method that only considers the linear spring coefficient,this method has higher accuracy and is more consistent with the actual situation.This method can input different nonlinear springs for pile foundations at different positions,and can be used to solve the settlement calculation problem of pile raft foundations in complex and uneven formations.
Q-s curvelarge LNG storage tankpile foundation settlementcomplex geological stratanonlinear springs
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