Bituminous Pavement Built-in Reliability Research

In half sixty years last century, researchers began to notice the uncertainty in the road engineering and its influence on the performance of the pavement structure. As a result the reliability theory was applied in the road surface research, the structure analysis and so on. Based on the engineering structure reliability theory research, the paper accounts for the uncertainty, randomness and efficiency, analyses the key parameters to the reliability and proposes a limit condition model of concrete pavement. An example about the temple of Confucian road pavement project by Harbin Project University is used to discuss.At first the reliability theory and its evaluation method are introduced. According to "Road Bituminous pavement Design Standard"(JTG D50 - 2,006) a limiting condition equation is established which takes the deflection and the tensile stress as the control target. The reliability can be calculation by Monte Carlo method. The maximum entropy method is used to fit the probability density function for calculating structure failure probability and reliable indexes. The details are as follows:1,Combine the Monte Carlo method and the maximum entropy method to analyze the asphalt path reliability effectively and easily.2,Give probability density function produced by the maximum entropy method.3,Propose a calculation program to solve the asphalt path reliability problem analyze the asphalt roadway structure characteristic and assess the reliability.In brief, this article has constructed the asphalt roadway structure reliability computation model, made a progress in the computation algorithm and built the foundation for further research and practical application.