Numerical Simulation Of The Sunny-shady Slope In Non-uniform Open-wall Ventilation Ducts In Permafrost Regions

In the Qinghai.Tibet Plateau permafrost to built the roads which has sunny.shady slope effect,will cause a variety of road disease problems,which seriously affected the road traffic safety.In the context of global warming,the sunny.shady slope effect will be further enhanced.At present,the number of permafrost embankment is designed and studied to reduce the effect of sunny.shady slope.To slove the problem,this paper puts forward a non.uniform open—wall ventilation duct embankment based on the ventilation pipe embankment for the first time.Consider the problem of asymmetric distribution of temperature field distribution in the embankment—caused by the effect of sunny.shady slope effect by using the uneven cooling effect along the axial direction of the tube.The main material of embankment is gravel soil,the ventilation duct which buried in it.The main consideration through the pipe wall openings,near the soil in the evaporation of water to exchange heat in the gravel soil.Through the establishment of three.dimensional embankment model,the simplified hydro.thermal coupling equation is used as the physical field control equation to study the concrete effect of using this form of permafrost on the treatment of sunny.shady slope effect.This paper mainly carried out the following aspects of the study:(1)Analyzing the advantages of using the custom equation module in COMSOL numerical simulation software and analyze the specific physical field control equations used in the model,which can be transformed into the model.This shows that the numerical simulation of the process used in the physical field control equation is very clear,there is no redundant interference in the software module,so the results are reliable.(2)From the point of view of the accuracy of the simulation results and the saving of memory,the paper analyzes the specific grid division of the two.dimensional ordinary fill embankment model and obtains the recommended grid numbers when using triangular meshing.(3)Analyzing the specific characteristics of the temperature field in the embankment which filled with soil material and in different temperature of sunny.shady slope effect.(4)Under the condition of strong temperature changes between sunny.shady slope.The three.dimensional roadbed model is established to analyze the reliability of the permafrost foundation structure.