Ventilation Tube Roadbed In Permafrost Temperature Field Of Study

Because the global elevation of temperature causes permafrost to assume the degenerated tendency, permafrost area embankment thermal stability has received the widespread attention. In order to guarantee the embankment thermal stability, must protect permafrost already is a mutual recognition. In the multitudinous protection permafrost project measure, the ventilation embankment is one kind protects the frozen earth positively the project measure.This article take the Qinghai-Tibet Highway Wudaoliang ventilation duct experiment road as the computation model, has established the embankment non-stable state temperature field finite element analysis model which contains changes, has carried on the finite element computation to the different form ventilation embankment temperature field, has with emphasis analyzed the typical ventilation embankment temperature field condition as well as the caliber size, the embankment, the ventilation duct depth of burying, the tube is apart from and turns off the curtain screen highly to the ventilation embankment temperature field influence.The research indicated that, Under the identical climatic conditions, the ventilation embankment compares the ordinary roadbed, the temperature decrease effect is obvious, can play reduces the frozen earth embankment temperature, protects the frozen earth roadbed stable role; The ventilation duct caliber has to the embankment temperature field affects greatly, the caliber is bigger, the air draft convection effect is more obvious, to protects the frozen earth embankment to be more advantageous; The embankment has highly to the ordinary embankment temperature field affects greatly, but in the ventilation embankment, as a result of the ventilation duct room partition embankment soil body, has caused under the ventilation embankment soil body thermal resistance to be same, therefore under the ventilation embankment temperature field is nearly same; The ventilation duct depth of burying has to the embankment temperature field affects greatly, the cold season ventilation duct installs underground deeply, to protects the frozen earth embankment stability to be more advantageous, then warm season opposite, but synthesizes looked, the ventilation duct burying depth is deeper, the frozen earth embankment temperature field is stabler; Ventilates the tube spacing to have to the embankment temperature field affects greatly, the cold season ventilates the tube spacing to be smaller, to protects the frozen earth embankment to be more advantageous, otherwise then the warm season, looked from the embankment temperature field overall condition, the...