Research of water damage in powdered road base slope;

According to soil subgrade compactness mechanism and influence factors of its compactness results,combining with comparison of soil subgrade compactness control method at home and abroad,it is of significance to formulate high-grade soil subgrade compactness control standard reasonability based on soil composition.

Ballastless track on soil subgrade has been already widely used on high-speed railway abroad, but it is just at the starting stage in China.

This thesis focuses on the slab track layed on the soil formation.

As one of a main parts of overseas high-speed railways route, temperature load has important influence on the slab track structure on the soil formation.

In order to effectively forecast the non-uniform cumulative settlement of silty sand roadbed under long term repeated traffic loading,it is important to reflect deformation patterns of silt sand reasonably under different stress levels and initial status.