Experimental And Numerical Analysis Of Uplift Behavior Of Anchor Plates In Sand Foundation

The anchor plate is a very reliable foundation to provide pullout resistance for various structures.In this paper,the author systematically studies the failure characteristics of the anchor plate in the sand,which is of great significance to the efficient and safe construction of electric towers,suspended platforms,protection embankments and other infrastructures,as well as the improvement of the stability of the infrastructure in the face of various geological hazards.Anchor plate foundation has wide prospects in the application field of large platform foundation because of its accurate location,short construction time,little environmental damage and good economic performance.But how to accurately identify the deformation and failure mode of soil and how to use economic and effective hand to improve the uplift resistance of anchor plate are two core issues in the research of anchor plate foundation.In this paper,a series of model experiments and simulation studies are carried out around the above two problems,and the following results have been obtained.(1)The author summarized the research status and latest progress of horizontal anchor plate foundation in sand at home and abroad,and elaborated the shortcomings and difficulties of current research and put forward the direction and key points of anchor plate foundation research.(2)In this paper,through a series of pullout tests of horizontal anchor plates under different combinations,the influence of sand compaction degree,anchor plate embedment depth,drawing rate and setting of reinforcement layer of geogrid on the uplift characteristics of anchor plate is systematically explored.(3)Through a series of anchor plate model tests in sand foundation based on particle image velocimetry technology,the distribution and development trend of different combination conditions of anchor plate deformation of surrounding soil,fine analysis of the soil displacement and the maximum shear strain field,thus accurate identification of the four types the soil around the anchor plate basic failure mode,and gives the reasons of the failure mode under different combinations of the corresponding.(4)In order to monitor the deformation of anchor plate on the upper level of soil,the distributed optical fiber sensing technology was used,the linear strain data of anchor plates in the upper level of the soil,and the distribution characteristics of cloud visually show the level of soil upper plane deformation.The results show that the deformation and failure mode of the anchor plate based on similar the failure mode of discovery.(5)Combined with the classical soil mechanics theory of the mohr-coulomb yielding criteria,a detailed finite element analysis was carried out for the uplift characteristics of anchor plates in sand foundation.Finally,the accuracy of the model test is determined by comparing the results of the finite element analysis,PIV analysis and optical fiber monitoring.