In order to study the cooling effect of the crushed-rocks embankment, the permeability and the inertial resistance coefficient\nwere measured by the wind tunnel test of spheres with a diameter of 20 cm, and then the stabilities of the closed crushed-rocks\nembankment with the wide pavement, the closed crushed-rocks embankment with the narrow pavement, and the duct-ventilated\nand closed crushed-rocks embankment were calculated. In the next 50 years, assuming that the temperature in Qinghai-Tibet\nplateau will rise by 2.6?C condition, the cooling effects of these three special high-grade embankment structures were studied.\nThe test results and the numerical calculation results show that the relationship between pressure gradient and seepage velocity\nin the spheres layer diverges completely from Darcy�s law, and it shows a nice quadratic nonlinear relationship. Stabilities of those\ntwo closed crushed-rock embankments without the duct-ventilated structure could be destroyed because of the high permafrost\ntemperature under embankments. The duct-ventilated and closed crushed-rocks embankment can cool down the permafrost\neffectively and raise the permafrost table and ensure the long-term thermal stability of permafrost under road.
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