Study On Bearing Capacity Mechanism Of Horizontal Anchor Plate In Saturated Soft Clay

Anchor plate foundation is one of the most widely used anchoring forms in offshore floating platform.In recent years,many scholars have studied its failure mechanism and bearing capacity calculation,but they have not reached a general consensus.In this paper,aiming at the problem of uplift bearing capacity of anchor plate in saturated clay,the upper bound theorem of limit analysis,the lower bound theorem of limit analysis and the slip line theory are used to study the bearing capacity mechanism of anchor plate,deepening the understanding of the failure mechanism of anchor plate foundation in saturated clay,so as to provide useful suggestions for engineering application.The main research contents and achievements are as follows:(1)Based on the principle of upper and lower bound of limit analysis,the upper bound finite element program and the lower bound finite element program of limit analysis are compiled by MATLAB.The results of the two programs are compared with the results of the conventional finite element method and the test results,and the applicability of the two methods in the study of anchor plate bearing mechanism is verified.(2)The mechanism of bearing capacity of horizontal anchor plate in homogeneous soft soil foundation is studied by limit analysis lower bound solution finite element method and limit analysis upper bound solution finite element method,including the change rule of bearing capacity coefficient with depth width ratio,the failure area of foundation,the allowable stress field and the allowable displacement field when the foundation is damaged.The upper and lower bound solutions of bearing capacity of anchor plate are obtained,and the shallow burial is revealed At the same time,the critical depth width ratio between the two failure modes is proposed.(3)The bearing capacity mechanism of the horizontal anchor plate in the inhomogeneous soil foundation with the strength changing linearly along the depth is analyzed by the limit analysis lower bound solution finite element method.The influence of the change rate of the strength along the depth on the bearing capacity coefficient of the anchor plate and the damage area of the foundation is studied.According to the specific scope of the plastic area,the practical calculation method of the bearing capacity of the anchor plate in the inhomogeneous soil foundation is proposed.(4)According to the results of the finite element analysis of the lower bound solution of the limit analysis,the slip line field of the anchor plate foundation under the deep buried failure mode is established,and the value of its bearing capacity coefficient is derived.