Method and pavement structure for protecting highway subgrade in frozen soil area
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United States of America Patent
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Nov 6, 2012
Grant Date -
Oct 6, 2011
app pub date -
Dec 31, 2009
filing date -
Dec 31, 2009
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Abstract
The present invention provides a method and pavement structure for protecting highway subgrade in frozen soil areas. The pavement structure has two or more pavement layers having gradient thermal conductivity; the thermal conductivity is layered among the pavement layers and is lowered from top to bottom, so that the pavement forms a uni-directional thermal conducting tunnel from the subgrade to the air. Heat can be easily released from the subgrade into the air, and is prevented from being transferred from the air to the subgrade. In this way, the frozen soil layer beneath the subgrade is cooled, so that the frozen soil table is made stable, and the highway subgrade in frozen soil areas is protected.
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