Experimental Study And Numerical Simulation Of Anchor Plate Behavior

As an important anti-pull structure,the anchor plate is widely used in various engineering construction activities.Studying the bearing capacity of the anchor plate is of great significance for the application of anchor plates.The process of the anchor plate withstanding the pull-out force is a complicated process of the interaction between the anchor plate and the surrounding rock and soil.However,due to the constraints of monitoring technology,it is difficult to obtain parameters that reflect the interaction between the anchor plate and the surrounding rock and soil.Many design theories used in engineering are quite different from reality.The main research object of this paper is the pull-out bearing capacity of single anchor and tandem anchor plates.Based on the field test of the bearing capacity of single anchor plate and tandem double anchor plate,combined with numerical simulation,the working characteristics and influencing factors of single anchor plate and tandem double anchor plate were systematically studied,and the following main conclusions were obtained:(1)Based on a group of single anchor plates and a series of double anchor plates in situ pull-up bearing capacity test results,the working characteristics and influencing factors of single anchor plates and tandem double anchor plates were studied in comparatively methods.The research results show that the pull-out force-displacement relationship curve is a typical hyperbolic curve,whether it is a tandem or traditional single anchor plate,whether shallow or deep.The ultimate bearing capacity of tandem double anchor plates is much larger than that of single anchor plates.(2)Based on FLAC3 D numerical analysis software,finite difference models of the working behavior of single anchor plate and tandem double anchor plate were established.The field test results verified the reliability of the numerical simulation model.The research results show that: for shallow buried anchor plates,the ultimate load capacity of the anchor plate increases rapidly as the depth of the anchor plate increment;for deep buried anchor plates,the ultimate load capacity(3)of the anchor plate increases as the depth of the anchor plate increases,but the increment is finite,the critical burial depth ratio is between 7.0-8.0.(3)For tandem square double anchor plates,the current rear anchor plate spacing is less than 2 times the side length of the anchor plate,the anchor plate bearing capacity increases rapidly with the increase of the front and rear plate spacing,the current rear anchor plate spacing is greater than 3 times the anchor plate As for the side length,the increase in the bearing capacity of the anchor plate gradually decreases with the increase of the distance between the front and rear plates.Therefore,for a series of square double anchor plates,the reasonable plate spacing of the front and rear anchor plates is 2.5-3.5 times the side length of the anchor plate.(4)Based on the numerical simulation results,a multivariate nonlinear regression analysis method was used to establish a mathematical equation for calculation of the allowable bearing capacity of the tandem double-anchored plate,In addition,exploiting statistically tested to verify the reliability of the regression equation.