SSC JE Civil Engineering 30-Oct-2020 Shift 1 Paper

Flexible pavement is modeled as an elastic multilayer structure. Failure criteria in flexible pavement are of following types:

1) Fatigue Cracking

• It is due to the build-up of horizontal tensile strain at the bottom of the asphaltic  concrete layer.
• The pavement is considered to fail if 20 % of the surface has cracked.

2) Rutting failure

• It is due to the build-up of excessive compressive strain at the top of the  subgrade layer.
• The pavement is considered failed if it exhibits a rut depth of 20 mm.