Study On Mechanical Properties Of Waste Tire Strips And Bearing Characteristics And Deformation Of Reinforced Embankment Slopes

With the rapid growth of the number of automobiles,the storage problem of a large number of used tires has become the focus of the environmental protection department.In particular,the occurrence of several fires in recent years has seriously affected the public safety of the society.The recycling of used tires has become a social concern.Important question.The research shows that the used tires have good performances such as refractory,corrosion-resistant and high-strength.They have been applied to landscape retaining walls,embankment underlays,abutment backfills and pavement structures in engineering,and have achieved good application in foreign countries.effect.However,in China,it is often crushed or refined as an additive for road materials,which not only causes secondary pollution of the environment,but also greatly wastes the technical advantages of the tire itself.Therefore,this paper attempts to cut it into strips to form reinforced strips or reinforced nets.It has been tested as the basic mechanical properties of reinforced materials,and applied in reinforced slopes to analyze its bearing characteristics and application effects,revealing The reinforcement mechanism and key influencing factors provide the basis for the subsequent theoretical research and the establishment of design methods.According to the research results of this paper,the following conclusions have been made:(1)By carrying out the tensile properties of the waste tire strips and the drawing characteristics of the different backfills,it is found that the failure mode of the tire strips is a transition from the elastic limit state to the breakage failure,and no plastic yielding occurs.The drawing characteristics of the waste tire strips are closely related to the internal friction angle of the backfill,the compactness,the overburden load,the strip form,etc.,among which the tire strips have different types of backfilling materials,and the in-plane friction between different dense backfills The angles are greater than the internal friction angle of the filler itself,forming a high strength interface.By comparing the tire strips in the form of a single tire strip and a grid,it is found that the ultimate pull-out force of the waste tire strip is significantly improved.due to the end resistance effect after the addition of the transverse rib,and the relationship between the increase of the pull-out force and the number of transverse ribs Approximate into a parabola.At the same time,the drawing force of the waste tire strip was equivalently converted and compared with the geogrid,revealing that the ultimate pulling force of the tire strip is greater than that of the geogrid and the ultimate pulling force is required.The displacement is significantly higher than that of the geogrid,which indicates that the ability of the waste tire strip to control the structural safety is better than the geogrid,especially for the advance warning of the structure.(2)Through the indoor model test of the bearing characteristics of the reinforced slope of waste tires,and the introduction of particle image velocimetry(PIV),the ps curve of the natural slope and the reinforced slope,the displacement of the slope and the plastic zone of the fracture surface were compared.Expansion.The research shows that by increasing the number of layers of ribs,the corresponding load is significantly increased when the slope is unstable and the foundation settlement is also significantly increased,indicating that the safety factor is improved.By comparing the displacement vector diagram of the reinforced slope and the plastic zone expansion map,it is found that with the increase of the number of reinforcement layers,the failure mode of the reinforced slope changes from circular shear failure to integral compression deformation failure,and the slope The maximum amount of lateral displacement is also reduced,thus verifying the application effect of the tire strip reinforced slope.(3)In order to further reveal the key influencing factors of the reinforced earth slope of waste tires,considering the internal friction angle of the soil,the length of the belt,the number of layers,the spacing,the depth of the burial,and the slope angle,the influence law of various factors is carried out by numerical analysis.The results show that the slope of the slope can be properly improved under the condition of satisfying certain bearing capacity by the reinforcement of the reinforcement.The length of the reinforcement and the reinforcement depth should meet certain conditions to achieve The best reinforcement effect.