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As per IRC:37-2012, in order to control subgrade rutting in flexible pavements, the parameter to be considered is

1. horizontal tensile strain at the bottom of bituminous layer
2. vertical compressive strain on top of subgrade
3. vertical compressive stress on top of granular layer
4. vertical deflection at the surface of the pavement

Correct answer: vertical compressive strain on top of subgrade

Solution

In mechanistic-empirical pavement design, rutting in the subgrade is controlled by limiting the vertical compressive strain at the top of the subgrade. Horizontal tensile strain at the bottom of the bituminous layer is used for fatigue cracking, not rutting.

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