Study On Typical Diseases And Preventive Maintenance Techniques Of Subgrade Slope

China established the first expressway and opened to traffic in 1988.By the end of 2017,China had a total mileage of 136,000 kilometers.China's rapid socio-economic development will continue to increase highway construction and recapitalization.The total mileage of China's highways is planned for 2020.Reaches 200,000 kilometers.Over the past two decades,the growth and construction of the expressway,the highway gradually formed a 7918 network,a wide range,efficiency,outstanding results,comfort and visibility.With China's near-and-long-term plans,it is imperative to focus on the construction and development of expressways,and the diseases that are immediately encountered are becoming more and more prominent,such as mutual interference with the expansion and opening operations,low traffic safety,and a large number of management and maintenance.Problems such as workload.It can be seen that the disease conservation work on the highway has become increasingly prominent.Increasing the custody capacity and decision-making capacity of highway custody units and maximizing the economic and social benefits of developing roads have become an urgent task for highway construction and maintenance work.Based on the analysis of the status quo of the maintenance of subgrade engineering and the problems and challenges faced by the subgrade,this paper carries out a research on the preventive maintenance methods for the typical diseases of road subgrade.Through the analysis of the types,causes of the typical roadbed diseases,and the feasibility of the maintenance methods,it was determined that the object of this study was landslide disease in the roadbed slope.By studying the disease prediction of high slope on roadbed,the preventive maintenance methods of landslide diseases in typical diseases,and the best time to implement conservation,a preliminary maintenance system for the typical diseases(landslides)of highway roadbed was established.The main content of this paper is as follows:(1)After a long period of data collection,reading,and collation,six types of typical subgrade slope structures,ie,eye-like spherical slope structures,massive slope structures,pedestal slope structures,were summarized and summarized.Stratified slope structure,homogenous body slope structure and loose crushing body slope structure.(2)Review the relevant research results at home and abroad.Without a uniform standard,summarize five typical slope problems: rockfall,collapse,misalignment,landslide,and dumping.According to the length of time the disease is generated and developed,it can be divided into new slope disease and old slope disease recovery.According to the scope of the slope disease,it can be divided into four categories: mountain disease,slope disease,slope disease and slope disease.(3)Research focused on the impact of several important internal and external factors on the slope,including the slope structure is an intrinsic factor and plays a controlling role.The external need to consider the excavation and the important impact of water,expounded the slope The influencing factors of the disease.(4)On the results of previous studies,the method of defining the slip surface in the limit equilibrium method and the method of defining the safety factor in numerical calculation can predict the potential location of the slope and the safety factor as a quantitative basis.By analyzing the stress field of the slope during the process of damage evolution,it is also possible to judge the attenuation process of the safety factor of the slip surface,thus providing a basis for preventive maintenance.(5)Based on the analysis and comparison of the previous conclusions,the landslide disease in typical roadbed diseases was selected as the research object.Using ABAQUS finite element analysis software,the engineering example was used as the background to simulate the stress deformation of the anti-slide pile.Four kinds of landslide preventive maintenance methods.(6)Combining the principles of economic analysis and the disease development process based on disease prediction,on the premise that the disease will not be further aggravated,appropriate cost types are selected,corresponding cost calculation models are given,and practical value prevention is obtained.The maintenance cost calculation framework finally combines the changes in the degree of safety of the slippery surface to obtain the best time for conservation.