Study On The Critical Technology Of Repair For Asphalt Pavement Based On Reliability

The management objective of road maintenance is to maintain and improve the quality of the road using with the scientific method of road maintenance. It means that take the most appropriate measures to the road entities in the most appropriate time under the guidance of scientific management methods. In order to make scientific planning and decision-making, the research of advanced management methods and theory must be developed. Reliability-centered Asphalt Pavement Maintenance Technology is an advanced maintenance management method. Its basic objective is to ensure the reliability of road maintenance. Category and summary the diseases reasonably, identify the best maintenance measure to do with various diseases under the scientific analysis. This method can not only ensure the reliability of the road structure, also can enhance the effectiveness the efficiency. The applications of reliability-centered maintenance technology can not only improve China's current situation of road maintenance management and improve the efficiency of road maintenance work, but also can provide the virtuous cycle of operation a framework for road management systems (including road design, construction, use, repair and related Formulate laws and regulations), and develop a continued and sound road maintenance management basis.In this paper, the content is divided into six parts: (1) Firstly, expounding the basic knowledge of the maintenance, analyzing the main content of the reliability-centered maintenance theory and establishing the content of the reliability-centered Asphalt Pavement Maintenance Technology.(2) Study the probability distribution through statistically analyzing the traffic flow, the road structure thickness, compressive rebound modulus, deflection and other road structural design parameters; and then use the Reliability analysis tools which regard the various factors as the random variables of the importation, regard the road will form deflection, the layers stress and limit state function as a variable output to make the reliability analysis of the typical asphalt pavement structure.(3)From the existing asphalt pavement reliability of the analysis of the state point of view, use the current advanced NDT technology to test the existing asphalt pavement reliability parameters, and then use load stress level, contacts between the states and other factors to calculate the impact of structural reliability, finally use the theory of grey system to forecast the existing road structure of the state.(4) Base on the large amounts of data of the existing road conditions, the basic theory of the reliability and use the method of mathematical statistics and Mintab procedures to make a comprehensive research and analysis including the highway parameters' probability distribution model of asphalt concrete pavement and the level of variation, and then evaluate road conditions with collection analysis and the theory of fuzzy risk .(5) From the performance indicators of using the asphalt pavement point of view, established comprehensive forecast model of the pavement performance indicators using the element comprehensive method of the extension theory , access to quantitative evaluation of the numerical results by calculating its affiliates to determine the type of pavement performance in the future, and then tell the details of asphalt pavement cancelled projects, assessment methods of increasing projects economic dominant and recessive combining the characteristics of asphalt pavement maintenance. Finally, establish a model to calculate the best maintenance cycle with the method of multi-objective planning, and use examples to verify. (6) Through the mechanical analysis of old asphalt pavement concrete overlay, research the influence rule about traffic load, temperature and the two factors working together; On the based of the analysis of traffic load parameters' variability , calculate the changes rule of cement overlay reliability with a total equivalent of the axis.