Finite Element Analysis Of Inner Support Of Foundation Ring Beam Based On Midas/gts

Foundation pit engineering is geotechnical engineering has been the development and exploration of important research content.How to ensure the stability of excavation during excavation to make it safer has always been an important research topic.At present,the inner support of the ring beam,as a relatively new type of support,has been developed and popularized by virtue of its own unique advantages,and its scope of application is also relatively extensive.It is a better foundation pit support.However,there are relatively few studies on the inner support of the ring beam,the lack of theoretical support and lack of understanding of the mechanical characteristics and deformation characteristics of the inner ring beam.Therefore,further research on the inner support of the ring beam is in line with its theoretical development requirements and the urgent need.In this paper,the finite element analysis software midas / gts is used to simulate the inner support of the ring beam,and the axial force and the shear force of the ring beam and the side beam are studied respectively with the radius of the ring beam,the presence or absence of bracings and the number of sides of the ring beam as variables,Bending moment,displacement,and the horizontal displacement of continuous diaphragm wall.Furthermore,the influence of the different positional relationship between the ring beam and the side beam on the force and deformation characteristics of the ring beam and the side beam is increased.The main contents and conclusions of this paper are as follows:1.ring beam internal force variation:(1)Increases the radius of the ring beam and decreases the axial force of the ring beam,The axial force is increasing;adding the bracing in the inner support of the ring beam can effectively reduce the maximum axial force of the ring beam and the side beam;when other conditions are the same,the axial force of the regular polygonal ring beam is equal to the circular ring The axial force of the beam is small,while the axial force of the inner support beam in the regular polygon ring beam is larger than the axial force of the inner support beam in the equilateral circular ring beam.(2)The radius of the ring beam is increased,and the shear force of the ring beam and the edge beam are both The shear force of the ring beam and the side beam can be reduced;while the other conditions are the same,the shearing force of the regular polygonal ring beam is smaller than that of the circular beam.(3)Increases the radius of the ring beam and the bending moment of the ring beam and the edge beam Is reduced.Adding diagonal bracing in the inner support of the ring beam can reduce the bending moment of the ring beam and the edge beam.The bending moment of the support ring beam and the side beam in a circular ring beam It is a few times more than the bending moment of the support ring beam and side beam in regular polygon ring beam.(4)When the ring beam and the short side of the side beam are tangent,the axial force,shear force and bending moment of the ring beam should be smaller than the axial force,shear force and moment when the ring beam and the long side of the side beam are tangent.The axial force,shear force and bending moment of the side beams are basically larger than the axial forces,shear forces and bending moments when the ring beam and the long side of the side beams are tangent to each other.2.supporting structure displacement changes:(1)Increase radius of the ring beam,the horizontal displacement of the diaphragm wall along the long side of the foundation pit gradually increases along the short side of the foundation pit.Effectively reduce the horizontal diaphragm wall displacement.(2)Increase the radius of the ring beam,the displacement of the ring beam in the horizontal direction increases,the displacement of the side beam decreases,the vertical displacement of the ring beam decreases,the vertical displacement of the side beam increases.Changing the shape of the ring beam affects the horizontal displacement of the ring beam and its side beams more than the vertical displacement.(3)When the ring beam and the side beam are tangent,the horizontal displacement of the diaphragm wall is better than that of the ring beam inside the side beam.Whether the ring beam is tangent to the long side or tangent to the short side,The effect of horizontal displacement of diaphragm wall is very close.the displacements of the side beam and the ring beam are equal along the tangential direction.