Recognition method of void beneath cement concrete slab based on ration of deflection;

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;

According to investigation, dynamic penetration test, core analysis and deflection test,the relations between the troubles and climate, thawing of permafrost under the embankment, load-bearing capacity of foundation, material of pavement structure layer are discussed in this paper.

Research on the compactness connected with deflection value in highway enginnering;

Combined with the practice,the paper discussed the importance of detection rebound deflection value for county road reconstruction.

With the FEA method, the author calculated and analyzed the deflections of the pavement under dynamic loadings with different loading cycles, and compared the life ratio under different loading cycles as well.

Based on this,different cavity dimension,height,shape and areas beneath cement concrete slab s influence on deflection were analyzed.

Then the deflections of the pavement under the non-uniform distributed dynamic loads were calculated and analyzed,and the life ratios(LR) at different velocities were compared with the axle exchange methods.