Urban Road Infrastructure Maintenance Planning with Application of Neural Networks

Table 2

Input values—case C.

Case	Independent variable (x)	Dependent variable (y)	Specific load on the contact area (MPa)	Unbound granular material—thickness (cm)	Asphalt layer—thickness (cm)	Modulus of elasticity—asphalt (MPa)
C1	Asphalt layer thickness	Stress	0.7	20 and 90	4–20	4500
C2	Modulus of elasticity—asphalt	Stress	0.7	50	6 and 18	1400–9700
C3	Unbound granular material—thickness	Stress	0.5	20–100	10	1400 and 9700
C4	Specific load on the contact area	Stress	0.5–0.8	40	4 and 16	6700

Poisson’s ratio, (subgrade), (unbound granular material), and (asphalt layer); modulus of elasticity—unbound granular material 400 MPa; modulus of elasticity—subgrade 60 MPa.