| With the rapid development of national economy,the development scale of infrastructure construction is increasing day by day.However,for most mountainous areas in central and western China,due to the constraints of geological and geomorphic conditions,space and sites,the construction of high fill slope has become an indispensable key link in the infrastructure construction such as airport and embankment in this region.The effective control of deformation of high fill slope is an important evaluation criterion to improve its stability.In this paper,a new anchoring system,radial anchoring cable system,is studied in depth.The system can effectively improve the pulling capacity of the anchoring cable in the filling body and effectively restrain the deformation of the filling-bedrock interface along the high filling slope.The structural form of radial anchor cable is that the conventional anchor cable divides its steel noose into three secondary steel nooses evenly and symmetrically,namely one central steel noose and two lateral steel nooses radially distributed from the interface.In addition,a rigid baffle is fixed at the end of each secondary steel noose to further improve the system’s tensile strength.This paper adopts physical model test and numerical simulation analysis to study the tensile reinforcement mechanism of radial anchor cable.The specific research work and results are as follows:(1)End without anchor plate is studied through model test comparison of radial anchor cable in radiation Angle beta = 0 °,10 °,15 °,20 °,25 °,35 ° and 30 °,40 °eight cases drawing force and displacement P S curve and the limit drawing force,the results showed that the eight cases P-s curve trend,can be divided into the elastic stage,elastic-plastic stage and softening stage;As the Angle increases from 0° successively,the corresponding limit drawing force increases first and then decreases,especially when the Angle is equal to 25°,the limit drawing force is the largest.(2)Through model tests,the p-s curve,ultimate drawing force,soil failure process and fracture surface characteristics of a single anchor cable with anchor plate at the end of the anchor plate when the diameter D=7mm and 10 mm are compared.The results show that the trend of p-s curve is similar and can be divided into four stages: elastic stage,elastic-plastic stage,softening stage and failure stage;increasing the diameter of anchor plate has obvious effect on increasing the ultimate tensile force;the fracture surface is approximately horn-shaped.(3)The p-s curve,ultimate drawing force,soil failure process and fracture surface characteristics of radial anchor cable with anchor plate at the ends of the anchor plate D=7mm and 10 mm,and the radial Angle at the ends of the anchor plate D= 3°,10°,15°,20° and 25° were compared through model tests.The results show that p-s can be divided into elastic stage,elastic-plastic stage,softening stage and failure stage;when the diameter of anchor plate is the same,the ultimate drawing force first increases and then decreases with the increase of,and when the diameter is equal to 15°,the ultimate drawing force is the largest;at the same Angle,the larger the diameter of anchor plate is,the more serious the soil damage is;the fracture face is in the form of a trumpet.(4)The numerical simulation of the experimental content shows that the two results are basically identical.Simulation and on this basis,through the engineering example,the comparative study in the absence of high fill slope reinforcement and anchor plate is at the end of the radial displacement of the anchor cable reinforcement soil near the interface,and the reinforcement effect under different modulus.The results show that the anchor plate is at the end of the radial anchor cable reinforcement system can effectively inhibit fill slope displacement,improve the fill slope stability;increasing the modulus is beneficial to improve the reinforcement effect. |
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