Research On Mechanical Properties Of Hybrid Reinforced Soil Retaining Wall Unequal Length Prestressed Reinforcement Soil Retaining Wall

Unbonded prestressed reinforced soil technology,aiming at improving the shortages existing in the traditional reinforced soil,is a new reinforced soil technology.The core of unbonded prestressed reinforced soil technology is to apply pretension on the reinforcement and make side pressure plate,prestressed reinforcement and wall panel work together to provide active constraints on filler.Moreover,applying pretension on the reinforcements can improve the overall performance of the reinforced earth structure.The arrangement of prestressed reinforcement is one of the important factors that affect the mechanical properties and the stability of hybrid reinforced retaining wall which used the application of unbounded prestressed reinforced soil technique.In this paper,three experimental cases of hybrid reinforced soil retaining wall with the arrangement of prestressed reinforcement and one experimental cases of traditional reinforced soil retaining wall were designed and carried,and this model is studied by numerical simulation.The obtained results are as follows:(1)According to the principle of centrifuge model test,a new scale model test method is proposed to increase the packing density.According to the theory of dimensional analysis,the similar relationship between the test should be deduced.(2)Prestressed reinforcement that do not apply pre-tensioning do not affect the constraints of the adjacent fiberglass geogrid on the packing.After applying pre-tension to the prestressed reinforcement,fiberglass geogrid strain adjacent layers decreases,the corresponding lower grille constraints on glass filler.Under the top of the load,the strain on the fiberglass grille increases and the binding effect on the filler increases.(3)Compared with the ordinary fiberglass geogrid on the packing constraints,prestressed reinforcement-wall panel-side plate system of the packing capacity of the stronger,can reduce the filling process of the wall panel displacement.After the prestressed reinforcement are applied,the vertical settlement of the hybrid reinforced soil retaining wall under the vertical load and the horizontal displacement of the wall panel are smaller than those of the ordinary reinforced soil retaining wall,and the prestressed reinforcement-wall panel-side plate system can increase the stiffness of the reinforced body.(4)The prestressing force applied to the packing by the wall panel and the side plate has a diffusion effect in the reinforced soil,and the diffusion of prestressing is asymmetric in the vertical plane.The prestressing and diffusion range of the upper part of the prestressed reinforcement are larger than the prestressing and diffusion range of the lower part of the prestressed reinforcement.Increasing the length of the prestressed reinforcement in the lower part of the reinforced body can increase the diffusion range of the prestressing force in the upper packing of the prestressed reinforcement.(5)The length of the prestressed reinforcement in the lower part of the reinforced soil retaining wall affects the distribution of the base earth pressure of the reinforced soil retaining wall,and the earth pressure at the base of the retaining wall corresponding to the position of the lower side plate is peaked.(6)The pre-tensioning of prestressed reinforcement can significantly increase the wall back earth pressure of the corresponding location,thus changing the distribution of earth pressure on the wall.The increment is related to the wall area,the tensile force of the prestressed reinforcement and the depth of embedding.The calculation formulas of wall back earth pressure in pretension applying layers are proposed.(7)The finite element analysis software was used to simulate the model test condition,and compared with the experimental results,the simulation and experimental rules were consistent.