In order to research the capability of eliminating differential settlement of crushed rock layer,model experiment box was designed.

A new modified asphalt emulsion used for chip seal and it s performance;

Dosage of asphalt and aggregate is one of the most import factors affecting the quantity of chip seal.

Study on semi rigid pavement structure with granular base;

The results show that the effect of cross-anisotropy to surface deflection is not obvious when the thickness of granular base is at some degree.

This paper analysed the structure of asphalt pavement with granular base by nonlinear finite element method, in which the granular base was modeled with the Boyce nonlinear elastic model enhanced with a Drucker-Prager plasticity model and other layers were modeled with elastic model.

To have a further study of the new type soft subgrade reinforcing system of geocell reinforced gravel mattress and gravel pile composite foundation of its mechanism of load capacity and settlement development,three comparative model tests were designed and carried out under the direction of similarity theory and similarity criterions deduced through dimension analysis method.

After evaluation and analyses on the formation conditions and existing local experiences as well as new pile foundation technology, the load bearing layer of piles were courageously put on the detritus soil layer which is unconsolidated, character various greatly and bearing capacity low.

Corresponding calculation method and construction technique of gravel cushion for soft soil foundation treatment are briefly introduced.

Several methods are used are to test the physicomechanical indices of the gravel cushion.