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Lanzhou University of Technology (2018)

Research on Control Measures and Smulation Analysis of the Effect of Wind Drift Sand on the Desert Subgrade

卓海金;

Titre : Research on Control Measures and Smulation Analysis of the Effect of Wind Drift Sand on the Desert Subgrade

Auteur : 卓海金;

Grade : Master’s Theses 2018

Université : Lanzhou University of Technology

Résumé
There are a vast desert area which are spread at the Northwest of country and occupy one-seventh of the land area in China.Wind and sand two-phase flow is a kind of general gas-cluster two-phase fluid which has extremely complicated motion feature in desert areas.And it’s also a dominant form of sand hazard which has a strong impact on local people’s live and gives a great restraint in the development of their other businesses.Our current researches of wind-drift sand in desert areas are not sophisticated,so on the basis of vast relevant literature this paper used Fluent,one of the element software,the simulations with desert subgrade are performed based on the project o f Inner Mongolia’s “New Tao-Ezhou Railway” project,and the corresponding protection measures are rose,too.The main research works are as follows:1.Collecting relevant literature materials and understanding the basic theory of wind-drift sand in-depth and its motion characteristics.2.The simulations with desert roadbed under the wind-drift sand during construction are performed by the Fluent,and the analysis of wind erosion,sand accumulation characteristics,and distribution of wind velocity field a round wind-blown sand subgrade on different roadbed filling height is also made.At the same time,the features of wind erosion and sediment accumulation around the aeolian sand embankment and the distribution characteristics of the wind speed flow field under different slope conditions are compared and analyzed,so the variation laws of the wind speed flow field around the aeolian sand embankment is summarized.3.Combining with the results of simulation analysis about aeolian sand subgrade in the construction process,technical guidance and optimization of the construction technology and process of the aeolian sand roadbed of the “New Tao-Ezhou Railway” project is performed.4.The simulations with desert embankment under the wind-drift sand during operation are performed by the Fluent,and the analysis of the characteristics of sand accumulation around the embankments and the distribution characteristics of the wind-sand flow field at different heights is also made,and then the changes of the flow field around the embankment are summarized.5.Combined with the simulation analysis results of the railway embankment in the operation process,the paper provides reference for the installation of the windbreak and sand stabilization system in the “ New Tao-Ezhou Railway”project.

Mots clés : Wind and sand two-phase flow; Fluent; Desert subgrade; Aeolian sand; Wind speed flow field; Wind break and sand fixation;

Présentation (CNKI)

Page publiée le 14 mai 2019