Study On The Reasonable Filling Height Of The Roadbed In Desert Region

Because of the formation of desert environment, climate and wind conditions is various,geological, aeolian sand characteristics and vegetation has obvious difference, but at present,in the desert highway construction, the research work is not in-depth, there exist a series ofproblems about design, construction technical specification, regulations and standard urgentlydevelop. This makes how to ensure that the desert highway to improve construction quality,reduce cost, and ensure the smooth road is facing a major technical problems, therefore, itneeds a set of desert highway subgrade filling height for reasonable design method to improvethe scientific design process.Based on the applied practice of desert highway subgrade in Inner Mongolia and thedomestic and international desert highway survey, the article research the relations of theheight of roadbed and desert disaster. Mainly through the survey results and statisticalanalysis, it can reduce the influence of the desert sand hazard to highway roadbed fillingheight, through on-site observation, from sand flow factors, put forward to adapt thewind-blown sand roadbed filling height.Filling height of sand roadbed is influenced by many factors. Therefore, from muchangle and much azimuth, the article considers different factors in order to the reliable result.Based on the desert disaster survey and the wind sand flow field analysis report, andconsidered Stability analysis of roadbed, economic analysis of roadbed height and otheroutcome, this article find out the main influencing factors, considering the highway userequirements of different types of sand dunes, finally proposed under different highwayroadbed filling height of recommended values. Because of the natural condition abominablearea, low subgrade is difficult to avoid sand buried, in order to reduce the influence of lowerroadbed disease, low subgrade should not be used. In the roadbed stability analysis there aregiven with the embankment height corresponding to the roadbed slope gradient. The properheight of roadbed must have the corresponding slope, so as to ensure the smooth through sandpavement. According to the specific circumstances, it is mainly considered to avoid the effectof capillary water in hydro geological undesirable region. Sand test report provided by theroadbed filling height also has great referential value. The reasonable embankment height,suitable slope and slope type can effectively ensure the smooth passing of wind-sand flow,and avoid wind flow resistance irrigation road caused by sand buried, the filling height should organically combine with the filling height provided by survey analysis report. Sand fillingheight of roadbed should meet the minimum height of fill roadbed strength requirements, thatis the basic guarantee of subgrade strength and stability requirements.