Numerical Analysis Of Bearing Characteristics Of Winged Helical Anchors In Clay

The current helical anchor/pile has been applied in fields such as construction,power,marine,oil,and telecommunications.However,in recent years,with the gradual development of offshore wind power and the expansion of high-voltage transmission lines,there is a higher demand for foundations.In addition to the gravity of the foundation itself,there are also horizontal loads and huge overturning moments caused by wind,waves,current loads,or horizontal loads and unbalanced tensions from wires or broken wires.However,the helical anchor foundation has good resistance to pulling and compression,but its horizontal bearing capacity is not high when the anchor diameter is small.To improve the foundation’s horizontal resistance,a new type of winged self-drilling helical anchor/pile foundation has been proposed based on the traditional foundation with wings added.This article uses the large-scale finite element software ABAQUS to study the bearing characteristics of the winged helix anchor.The specific content is as follows:Firstly,numerical simulation is carried out on the existing field tests,and the calculated load-displacement curve is compared with the test results to verify the rationality and accuracy of the modeling method and the soil constitutive model selected.Based on the same modeling method,a numerical calculation model of the helix anchor in clay and winged helix anchors with different geometric dimensions was established.The displacement loading method was used for loading,and the foundation’s bearing characteristics were studied under three different types of loading,including uplift,horizontal loading,and vertical loading.According to the displacement-load curve development and ultimate bearing capacity,the influence of wing plate geometry on the bearing capacity of winged helix anchor foundations under these three types of loading was analyzed.Meanwhile,based on the plastic strain cloud map and displacement vector clouds map,the effect of wing plate geometry on the foundation’s failure mode was analyzed,and a theoretical calculation formula for the winged helix anchor’s horizontal bearing capacity was given.Based on the obtained unidirectional ultimate bearing capacity of the helical anchor and winged helical anchor,the load-displacement step loading method is used to simulate the working conditions of the foundation under upward pull-horizontal and downward pressurehorizontal combined loads,which means that a certain proportion of upward pull force or downward pressure force is applied at the top first,and then horizontal displacement is applied to obtain the relationship curve between horizontal force and horizontal displacement,thereby determining the ultimate horizontal bearing capacity under different vertical loads.At the same time,according to the displacement-load curve,plastic strain cloud map,and displacement vector cloud map,the influence of wing plate geometry size on the bearing characteristics and failure mode of the helical anchor and winged helical anchor under combination loading is analyzed.This article studied the failure mechanism and bearing characteristics of the foundation of the winged helix anchor under different working conditions.Meanwhile,the theoretical calculation formula for the winged helix anchor foundation’s horizontal bearing capacity was given,providing a reference for the design and application of new types of winged helix anchor foundations in the future.