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Washboarding
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Washboarding is the name of the process which results in unmetalled roads (particularly gravel roads or dirt roads) developing a series of regular bumps with short spacing in the road surface. The result is called a washboard road.
They are also known as corrugated roads.
Washboarding is an instability that occurs when vehicles move above a critical speed, that depends on the properties of the vehicles and the road surface.
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Encyclopedia
Washboarding is the name of the process which results in unmetalled roads (particularly gravel roads or dirt roads) developing a series of regular bumps with short spacing in the road surface. The result is called a washboard road.
They are also known as corrugated roads.
Washboarding is an instability that occurs when vehicles move above a critical speed, that depends on the properties of the vehicles and the road surface. If all the vehicles move below their critical speed the road will remain flat, but if they move faster, ripples will slowly grow and move in the direction of the vehicles. It has been argued that the vehicle's suspension is important, but this can not explain why washboard road forms when vehicles' suspensions vary so much. Many have argued that suspension is irrelevant and recent experiments confirm that washboard road forms without suspension A similar instability also occurs on train tracks, where it is known as roaring rails, and between rollers in machinery such as printing presses.
Mitigation
Washboarding cannot be prevented, but can be temporarily eliminated by regrading the road. The most effective way to permanently eliminate washboarding is through surfacing or installation of cellular confinement systems.
See also
External links
- by Ken Skorseth, accessed June 2, 2006
- , accessed June 2, 2006
- at Google Answers, accessed June 2, 2006
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