Page 316 - Planning and Design of Airports

274 Airp o r t D e sign

Wheel load
Horizontal strain and stress
at the bottom of the asphalt
Area of tire contact
Wearing surface

Base course

Subbase

Subgrade

Approximate line of Vertical subgrade strain
wheel-load distribution
Subgrade support
FIGURE 7-6 Visualization of layer elastic design theory.

interface to allow the user to input initial data concerning the sub-
grade of the area on which the pavement is to be designed, specifi-
cally the Young’s modulus of the subgrade, as well as the expected
fleet mix that will be using the pavement. As illustrated in Fig. 7-7,
FAARFIELD provides the recommended thickness of each layer
within the flexible pavement structure, using recommended pavement

FIGURE 7-7 Example output of FAARFIELD software for fl exible pavement
using layered elastic design theory.