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.

Combined with the project practice of superficial mud jacking of asphalt pavement of one freeway in Guangdong province,it introduces construction technology of superficial drilling mud jacking,and compares the flexure value of after superficial drilling mud jacking with before,analyses the reasons of the rapid increasing of strengthening effect and it prompted value.

The calculation of theoretic rebound deflection and test standard of deflection in construction;

rebound deflection is an important measure to evaluate dry unit weight and bearing capacity of pavement structure layer.