Numerical Analysis Of The Influence Of Reinforcement Spacing On Mechanical Properties Of Non-bonded Prestressed Reinforced Soil Wall

Unbonded prestressed reinforced earth retaining wall is a new type of reinforced earth retaining wall.The working mechanism of this structure is to exert the active constraint on the filler in the side pressure plate and wall panel by prestressing force of prestressing tendons,and then improve the overall performance of the stiffened reinforcement.In the unbonded prestressed reinforced earth retaining wall,the spacing between prestressed tendons directly affects the confinement of the filler in the reinforced body,and also affects the mechanical properties of the reinforced body.Therefore,the study of the effect of reinforcement spacing on the mechanical properties of reinforcement is conducive to the design of this retaining wall,and laid a theoretical foundation for the popularization of the technology.In this paper,the numerical simulation method is used to study.The Marc finite element software is applied to the static simulation of 4 kinds of unbonded prestressed reinforced earth retaining walls with reinforced spacing,and on this basis,the effects of the friction angle,cohesive force and the load on the top of the reinforced body on the performance of the retaining wall are studied by using the retaining wall of 1m reinforcement spacing as the object.(1)under the action of the prestressed reinforced earth retaining wall under the upper load,the earth pressure on the back of the wall presents a nonlinear distribution along the wall,and the value decreases with the increase of the wall height.The maximum earth pressure on the back of the wall appears near the height of the retaining wall 1/3 wall.In the reinforcement area,the farther the ground pressure is from the panel,the larger the value,the larger the side pressure plate attached.In the non stiffened region,the pressure distribution of the base soil is uniform,the displacement of the panel in the middle and top of the retaining wall is larger,the displacement of the central panel is prominent to the outside while the top is opposite,the settlement at the top of the reinforced area is less than that in the top of the non reinforced area,and the settlement at the top of the non reinforced zone is more uniform.The earth pressure behind the retaining wall,the earth pressure on the foundation,the displacement of the panel and the settlement at the top of the retaining wall increase with the increase of the reinforcement spacing,but the variation of the top settlement is small.(2)under the same reinforcement distance and the upper load,with the increase of the friction angle,the value of the earth pressure in the back of the wall decreases,and the basement pressure of the reinforced zone decreases gradually,but the base soil pressure in the non reinforced area is not affected,the displacement of the panel and the settlement of the top are gradually reduced,and the horizontal deformation of the panel and the deformation of the top are increased.With the increase of the friction angle,the quantity is gradually smaller.(3)under the same reinforcement distance and the upper load,with the increase of cohesive force,the earth pressure and the top settlement of the retaining wall gradually decrease,and the data of the two mechanical properties of the cohesive soil are smaller than those of the non cohesive soil.For the cohesive soil,the earth pressure and the top subsidence of the wall are not much increased;in the reinforced area,the cohesive zone is cohesive with the cohesive zone.The pressure of the base soil decreases gradually,and the base soil pressure of the non cohesive soil is larger than that of the cohesive soil,but on the contrary in the non reinforcement area,and the variation of the base soil pressure of the cohesive soil is small,and the displacement of the retaining wall decreases with the increase of cohesive force.(4)under the same reinforcement distance and the upper load,with the increase of the top load,the earth pressure,the ground pressure of the basement,the displacement of the panel and the settlement of the top of the top of the wall all increase uniformly.