By analyzing the current design indexes, It indicate the problemsin application of curved sinking indexes, the introduction for two new design indexes being introduced and the new way using multi- design- indexes in our pavement structure design are all significant forthe improvement of rationality in pavement structure design.

By analyzing the current design indexes and their using situation,and discussing the problems in application of curved sinking indexes,the introduction for two new design indexes being introduced and the new way using multi-design-indexes in our pavement structure design are all significant for the improvement of rationality in pavement structure design.

It also elaborates how to fix the extent of disease by index examining methods and naked-eye estimating methods,brings forward remedial measures of concrete plasma-pouring methods.

Based on the elastic foundation model,the deflection rules under the loads of falling weight deflectionmeters(FWD)are comprehensively analyzed,and approximate formulas are obtained accordingly by regression among void scope beneath slab corner,deflection index(defined by deflection ratio of slab corner and slab middle under FWD loads),foundation type and relative stiffness radius of slab.

The Theoretical Analysis on Pavement Deflection versus Roadbed Settlement;

Analysis on influencing factors to deflection of slab with cavity;

Analyis of deflection and compressive strain on the surface and the subgrade of flexible pavement;