Research On Application Of Light-weight And High-Strength Materials In Disaster Relief And Repair Of Pavement Collapse

In recent years,the collapse of the road surface has become a common engineering disease.It seriously affects the safety of people’s lives and property with strong hidden,sudden,recurrent and secondary disasters.Traditional restoration materials are selfheavy,early strength is low,and maintenance cycle is long,and traditional restoration methods have a large amount of excavation and many construction procedures.After the accident,there is no fast and efficient response mechanism,which is extremely inconvenient for traffic recovery.The application of light-weight and high-strength materials to the treatment of road surface collapse diseases can not only complete repairs in a short time,and quickly open to traffic,but also has excellent mechanical properties and can be used as roadbed materials for a long time.Therefore,the study of light-weight and high-strength materials is of great significance to the rescue and repair of road pavement collapse.Combining numerical simulation with engineering practice,this paper studies the mechanical properties and deformation characteristics of Polyurethane used as permanent subgrade material after replacing soft foundation and grouting into the void,and guides the emergency repair and relief work of an actual disaster project,the following researches are mainly carried out:(1)Based on the relevant data of road collapse,this paper analyzes and summarizes the factors affecting the road surface collapse,and understands the formation process of the collapse.Comparing the mechanical properties and engineering applications of Polyurethane and traditional light-weight and high-strength materials in many aspects,using Polyurethane with excellent mechanical properties,rapid disease treatment and can serve as long-lasting roadbed materials to treat engineering diseases.(2)Using ABAQUS numerical simulation software,a two-dimensional model of the interaction of heavy-duty railway rail-heat sleeper-concrete pile foundation-track bed-subgrade-silty clay is established.Under the most unfavorable conditions of heavy loads,there are divided into four options to compare and analyze the settlement of the roadbed and the bearing capacity of the supporting layer after the polymer is replaced with a silty clay layer;analyze the stress of the polymer roadbed material as a plate structure Diffusion,its ultra-lightweight characteristics weaken the additional stress of the structure;comprehensively compare the shear stress cloud diagram and the plastic failure cloud diagram to study its shear resistance.(3)Relying on a certain disaster project,based on the above-analyzed mechanical characteristics and deformation characteristics,a three-dimensional model of the interaction of pavement structure-hollow-foundation is constructed and simulated.Research shows:After repairing of the Polyurethane grouting,the pavement settlement is significantly reduced,and the overall rigidity and strength of the subgrade are improved.The stress around the cavity is redistributed and the stress level in the foundation is effectively reduced.