The load stress variation analysis of the asphalt layer under symmetrical load function

The reflection crack of the old road surface to the asphalt is one of the main formations in the road hazards under the traffic load.It studies the asphalt adding layer's thickness,the elasticity coefficient and the ground elasticity coefficient under the symmetrical load function to the asphalt load.It finds the stress influences rule and discovers that the crack acme's destruction is decided by bearing or receiving to acme pulls.Then the designed variablefor adding layer is proposed.