By using Levenberg-Marqurdt and the global optimization theory,the static load creep tests to asphalt mixture under 40℃,200kPa and 40℃,50kPa are analyzed,and one kind of optimized asphalt mixture creep constitutive model is proposed,it overcomes the shortcoming that the commonly used model precision is not high and the model description extensibility is not good.

The analysis of the static load creep tests to asphalt mixture under 40 ℃,200 kPa and 40 ℃,50 kPa,indicated that the traditional machine model of asphalt mixture can not decribe the "consolidation effect"and "flow damage"at the same time.

The results indicate that change law of dynamic creep model is the same as that of statistic creep model,of which the loading is as much as the maximum of dynamic loading;and dynamic creep strain is smaller than that of statistic creep during the initial stage and stable stage;which are similar to the test results in references.

However,through studying the development of correlation of DS with the static creep stiffness modulus,the DS and static creep stiffness module are tried to be design parameters of the asphalt pavement structures.

Through comparing and analyzing the testing equipments, experimental conditions and influence factors of the existing test methods, static uniaxial creep tests and repeat creep tests are carried out on SBS modified asphalt mixture havs been put forward.

The steady creep rate, the stress exponent and the apparent creep activation energy Q,were calculated in the temperature range of 460℃～540℃and at different stresses.