| The masonry retaining wall is widely used in the bridge,the highway,the railway and other related projects,because it has the advantages of simple form,rich materials and convenient construction.However,with the increase of the use time and the occurrence of various natural disasters,the existing masonry retaining wall can not meet the actual use requirements,and there are serious safety hazards.Therefore,it is necessary to study the seismic performance of the masonry retaining wall and to explore scientific and effective reinforcement techniques.Firstly,based on the tilt test which simulated pseudo static condition,this paper uses ABAQUS to establish two-dimensional and three-dimensional finite element models of masonry retaining walls.The finite element model was numerically simulated with the same loading conditions as the test.Exploring the anti-overturn stability of the retaining wall and verifying the correctness of the two-dimensional numerical simulation.Secondly,a sine wave is applied to the two-dimensional finite element model to analyze the dynamic response characteristics and failure mechanism of the masonry retaining wall under seismic excitation.The accuracy of the numerical model is verified by comparing with the shaking table test results.The research shows that the main cause of the failure of the retaining wall is the lack of integrity,which results in a large displacement of the blocks on the upper part of the retaining wall.Finally,the method of reinforcing the masonry retaining wall by SNS system is proposed,and the ABAQUS analysis software is used for modeling.The static analysis and dynamic analysis of the strengthened model are carried out.The research shows that the SNS system can effectively reduce the horizontal displacement of the blocks and enhance the integrity of the model,thus effectively improving the seismic performance of the retaining wall.In addition,by changing the number of anchors,the influence of the anchor on the reinforcement effect of the SNS system is explored. |
