In order to overcome the defects of the classical model in the description of the rheological properties of soft soil, an Abel glue pot was defined based on the fractional derivative theory by the fractional calculus of Riemann-Liouville. Three components fractional order derivative solid model was built with Abel glue pot. Then the experimental data was fit using the new model. The simulation results show that the three components fractional order derivative solid model is more accurately than the generalized Kelvin model or Burgers model and that it has few parameters.

In order to protect natural environment and save construction cost, both the physical and mechanical properties and the strength change laws of stabilized sandy soil mixture were studied in this paper based on the characteristic of sandy soil stabilized by Lufeng-1 soil stabilizer. The results show that the pavement performance indexes of the sandy soil stabilized by soil stabilizer completely meet the design requirements of every pavement structure layer below base in certain proportion and the optimum proportions for pavement roadbed, sub-base and base materials also are recommended, which provide technological foundation for the utilization of sandy soil.

Cording to the measured data from the Fenshuiling tunnel of Lingnan freeway, the elastic modulus of tunnel surrounding rock and the horizontal crustal stress are back calculated with the system identification method. The results indicate that it is reasonable and the inversion procedure has stronger adaptive control,good convergent calculation stability,rapid calculation velocity. It shows that the system identification method to back calculate the elastic modulus of tunnel surrounding rock is effective.

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