Analysis of pullout bearing characteristics and influencing factors of tandem anchor plates
In order to improve the pullout bearing capacity of the anchor plate,a tandem anchor plates anchoring system was proposed.Based on the"M"method of the laterally loaded pile,the theoretical analysis method of the pull-out resistance-displacement relationship of the tandem rectangular anchor plates anchoring system was established by the force equilibrium condition and displacement continuity condition of the anchoring system.Based on FLAC3D finite difference software,a numerical simulation model of the interaction between anchoring system of anchor plate and soil was established,and the indoor modeling tests of the pull-out capacity of square anchor plate of different sizes buried in cohesive soil were carried out.Combining the indoor model test and numerical simulation results,the approximate analytical solution of the relationship between the pull-out resistance and displacement of the tandem rectangular anchor plates anchoring system was obtained by fitting analysis.The field test results of the pull-out resistance and displacement of the anchor plates with different sizes and depths of burial of the three engineering cases were compared with the theoretical analysis and numerical simulation results,and the correctness of the theoretical analysis method and numerical simulation results was verified.The effects of the burial depth of the tandem square anchor plates anchoring system and the spacing between neighboring anchor plates on the pull-out bearing capacity of the anchoring system were investigated.The results show that when the anchor plate anchoring system is buried at a depth of H<5b(b is the side length of the anchor plate),its damage pattern presents the damage characteristics of shallow buried anchor plate,and when the buried depth H≥5b,its damage pattern presents the damage characteristics of deep buried anchor plate.For the tandem anchor plates anchoring system,in order to avoid the mutual influence of neighboring anchor plates to reduce the pullout bearing capacity of the anchoring system,the spacing of neighboring anchor plates should meet L≥3b.
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