Study On The Working Behavior Of Series Double Anchor Plates Under Static And Cyclic Loading

This article is based on the National Natural Science Foundation of China project "Study on the bearing and deformation behaviors of tandem anchor plates under static and cyclic loads" led by the instructor.On the basis of summarizing and sorting out relevant domestic and foreign documents,indoor model tests and numerical simulations are combined,etc.Means,systematically studied the bearing deformation behavior and influencing factors of the series double anchor plate under static and cyclic loads.The main research contents and conclusions are as follows:(1)The indoor model comparison test of the load-bearing deformation behavior of the traditional single anchor plate and the series double anchor plate and the indoor model comparison test of the load-bearing deformation behavior of the tandem double anchor plate under different inclination angle conditions were carried out.The experimental results show that the slope of the pull-out force-displacement relationship curve between the series double anchor plate and the single anchor plate changes from sharp to gentle,and its shape is close to a hyperbola.From the application of the pulling force to the ultimate bearing capacity of the tandem double anchor plate,it can be roughly divided into three stages: the elastic deformation stage,the local shear stage,and the shear failure stage.The ultimate pullout bearing capacity of a single anchor plate is significantly lower than the ultimate pull-out bearing capacity of the tandem double anchor plate;the ultimate pull-out bearing capacity of the tandem double anchor plate buried vertically is the largest,and the ultimate pull-out bearing capacity of the tandem double anchor plate buried horizontally The force is the smallest,and the pull-out bearing capacity of the anchor plate decreases with the increase of the inclination angle.(2)Based on FLAC3 D software,numerical simulation of series double anchor plates.On this basis,the working behavior of the tandem double anchor plate under static load is systematically studied.And further study the influencing factors of the bearing capacity of tandem double anchor plates.The results of the study found that the ultimate pull-out bearing capacity of the anchor plate decreases with the increase of the angle between the anchor plate and the vertical direction.However,when the angle between the anchor plate and the vertical direction changes between45° and 60°,the ultimate pull-out bearing capacity of the anchor plate remains almost unchanged.The anchor depth rate of the anchor plate has a great influence on its working performance.When the anchor plate is shallowly buried,the anchor plate’s pull-out bearing capacity increases with the increase in the buried depth rate;when the anchor plate is deeply buried,and the anchor plate’s buried depth is less than the critical buried depth,the anchor plate’s pull-out bearing capacity increases with the buried depth However,when the buried depth of the anchor plate is greater than the critical buried depth,the increase in the pull-out bearing capacity of the anchor plate is small.For vertically buried double anchor plates in series,the critical buried depth is between 6.5D and 7.5D.between.The ratio of the distance between the front and rear anchor plates of the series double anchor plate has a significant effect on its bearing performance.When the current rear anchor plate distance ratio S/D is lower than the critical distance ratio,the anchor plate’s pull-out bearing capacity increases with the increase of the distance ratio,and the critical distance The ratio is between S/D=4-6.(3)A finite difference model of the interaction between series double anchor plates and soil under cyclic loading is established.The working behavior of the series double anchor plate under cyclic load is studied,and its influencing factors are analyzed.The research results show that with the increase of the number of cyclic loads,the displacement of the anchor plate can be roughly divided into three stages: the displacement mutation stage,the displacement accumulation stage,and the displacement resting stage.The critical cyclic loading times of the series double anchor plate are about10,000 times.The displacement of the tandem double anchor plate gradually decreases with the increase of the anchor plate buried depth rate.When the anchor plate buried depth rate H/D is less than 5,the anchor plate displacement increases with the increase in the number of cyclic loads;The buried depth ratio H/D is greater than 5,and the amplitude of the anchor plate displacement increasing with the increase of the number of cyclic loads is very small.The cyclic load ratio has a significant effect on the bearing properties of the tandem double anchor plate.When the cyclic load ratio is less than 0.6,the amplitude of the anchor plate displacement increases with the increase of the cyclic load ratio is small,and the displacement increases with the increase in the number of cyclic load actions.Not large.When the cyclic load ratio is greater than 0.6,the amplitude of the anchor plate displacement increasing with the increase of the cyclic load ratio becomes larger and larger,and the amplitude of the displacement increasing with the increase of the number of cyclic load actions becomes more and more obvious.The cyclic load frequency also has a greater impact on the load-bearing performance of the series double anchor plate.The anchor plate displacement decreases with the increase of the cyclic load loading frequency f.When the loading frequency is large,the anchor plate displacement increases with the increase in the number of cyclic load actions.The increase is small.With the increase of loading frequency,the amplitude of anchor plate displacement increases with the increase of the number of cyclic loads.