A Study Of The Theories And Methodologies Of Highway Pavement Crack And Roadbed Disease Testing

In recent years, highway construction in China has undergone rapid development. By October 2006, the total highway mileage has exceeded 45,000 kilometers. Most of the roads, however, require major repair work before their due dates and early occurrence of diseases is highly common. Speedy and efficient detection and diagnosis of the causes of diseases, therefore, constitutes the most critical task in daily highway testing and maintenance.Starting from the perspective of practical application of highway engineering, applying the theoretical methodology of system engineering, the present dissertation offers an analysis of the causes of highway asphalt pavement cracks and roadbed diseases as well as the characteristics of disease systems. It further studies the testing technologies and the analytical methodologies of decision-making by employing the computer graphic pattern recognition technologies. In addition, it analyzes the testing technologies and the analytical methodologies of decision-making by employing the computer graphic pattern recognition technology, and studies non-destructive testing technologies for roadbed diseases by adopting highway testing technologies utilizing ground-penetrating radar. In view of the correlation between highway pavement damages and roadbed disease, the dissertation proposes a theoretical approach that conceptualizes highway pavements and roadbeds as a whole system and puts forward a highway maintenance testing theory and methodology characterized by"proceeding from the surface to the interior and integrating three dimensions in one theoretical framework."By applying the principle of computer pattern recognition, the present dissertation creates an arithmetic model for speedy inspection and testing of highway pavement damage. Through a simulated study of the arithmetic model of roadbed diseases and the actual testing and verification of the physical model, the dissertation identifies the parameters for quantified disease inspection and testing, establishes a database for typical roadbed diseases, and makes an innovative study of the theory of quantified testing of moisture content, compactness and diseases, thus providing a theoretical basis for the"Three-Dimensions-in-One"testing methodology. Finally, the present dissertation establishes a highway disease decision-making model by the application of the theories and methodologies of the decision-making theory and constructs a complete support system for highway disease decision-making via the application ofsystem decision making (SDM) and highway geological information system (H-GIS), thus enabling the progression from the qualitative and semi-quantitative to the more scientific quantitative phase in highway disease decision-making.