What is the formula for getting the Thickness of a Pavement using Expansion Pressure

I'm sorry, but there isn't a universally accepted formula for calculating the thickness of pavement using expansion pressure. The thickness of pavement is typically determined by factors such as the type of traffic it will bear, the type of soil underneath, and the type of material used for the pavement itself. Expansion pressure might affect the durability or longevity of the pavement, but it's not typically used to calculate thickness. However, in specific cases, engineers might use expansion pressure in their calculations, but this would be based on specific, proprietary formulas or guidelines, not a general formula.