Study On The Pullout Capacity And Deformation Behaviors Of Tandem Double Anchored Plates

Anchor plate is an important form of uplift foundation,and it is the main component of anchorage system.It not only has excellent resistance to pull out bearing performance,but also has a simple structure and the advantage of cost economy strong adaptability.It is widely used in many fields of geotechnical engineering and it plays an irreplaceable role.In this paper,the working mechanism and soil flow mechanism of deep and buried anchor plates are summarized.On this basis,tandem double anchored plates is proposed.Based on the indoor model test and numerical simulation,article systematically comparative study the traditional single anchor plate and tandem double anchor plate uplift bearing characters and influencing factors,and the following main conclusions are obtained.(1)The traditional indoor model test of single anchor plate and tandem anchor plate was carried out.Based on the experimental results,the bearing characteristics of the two were compared and analyzed.The research result shows that tandem double anchor plate uplift bearing capacity is much higher than single anchor plate;The relation between drawing force and displacement is a typical hyperbolic curve in traditional single anchor plate or tandem anchor plate.(2)Based on FLAC3D finite difference software,the establishment of a traditional single anchor plate and tandem the working anchor plate finite difference model.Indoor model test results verify the reliability of the numerical simulation model.The results show that the drawing capacity of the tandem anchor plate is related to the depth of the anchor plate and the distance between the two anchor plates.For embedded anchor plate,when the anchor plate depth less than critical depth or anchor plate spacing is less than the critical distance between up and down.The uplift bearing capacity with embedded depth of anchor plate or anchor plate spacing increases;When the embedded depth of anchor plate is greater than the critical depth or anchor plate spacing is greater than the critical distance between up and down.The uplift bearingcapacity with embedded depth of anchor plate or anchor plate spacing increases almost remain the same.The critical burial depth of anchor plate is(8-11)D,and the critical spacing between upper and lower anchor plates is(4-6)D.(3)The failure mode of tandem anchor plate is closely related to the depth of anchor plate and the spacing between anchor plates.For deep-buried tandem anchor plates,when the spacing between upper and lower anchor plates is less than to greater than the critical spacing.The failure mode of tandem double anchor plate is changed from "cylindrical failure mode" to "independent local shear failure mode".(4)Based on the regression analysis method,the regression formula for calculating the drawing capacity of deep-buried tandem square anchor plate is established.The statistical test of regression analysis is carried out to verify the reliability of the prediction model of pulling capacity of tandem anchor plate.