Study On Characteristics Of Wind Erosion In Jining-Erenhot Railway Embankment

Railway plays an important role in the economic and social development of our country. Because of the natural and geographical conditions of the railway network in our country are dramatically different, there are different characteristics and forms of wind erosion in the desert railway in different regions, even in the different sections of the same railway are different Therefore we must seriously study the characteristics of wind erosion.This paper takes the Jining-Erenhot railway as the research target, to explore wind erosion at embankment with different heights under specific desert environment; measured the wind erosion characteristics of different heights (3m,6m and 10m) and calculated the wind erosion factors; used numerical simulation of the Fluent software to study the characteristics of wind erosion in railway embankments with different heights. The main results are as follows:(1) The slopes of the wind velocity profile at different points of the embankment with different heights are decreased with the increase of wind speed. At the windward side, the slope is the largest at slope shoulder when the wind speed is below the threshold wind velocity, and when the wind speed is above the threshold wind velocity, the slope is the largest at the ground. At the leeward side, regardless of the wind speed higher or lower, the slope is the smallest at the shoulder.(2) The wind speed at the windward ground of the embankment with different heights has a good linear relationship with the logarithm of the height.Other measuring points at the side of the windward slope also have a good linear relationship. Affected by ballast influence and vortex action, there is a poor linear relationship at the leeward slope. For the correlation coefficient of the linear fitting,3 m high embankment at the leeward, the slope of fitting is the worst.6m high embankment at the leeward slope, the slope of fitting is the worst 10m high embankment at windward slope shoulder and leeward slope shoulder, the slope of fitting are the worst.(3) When the measuring points at 0.2m height, from the windward ground to the windward slope toe, the wind speed decreases gradually. The wind speed in the process of the windward slope is gradually increased and at the windward slope shoulder reached the maximum value. The wind speed decreases sharply at the leeward slope shoulder. The increase from the middle of leeward slope to the leeward slope toe is small.(4) With the increases of the height from the surface at each measuring point, the difference of wind speed at each points of the embankment with different heights is decreases. The wind speed increase in the uphill process and decrease at the leeward slope shoulder has gradually slowed down. When the measuring points are above a certain height, the wind speed at the leeward slope shoulder is continues to increase than it at the windward slope shoulder.(5) In the numerical simulation, the near surface wind speed of the embankment with different heights under the same conditions are almost the same at the windward ground. At the windward slope toe, the leeward slope shoulder and the leeward slope toe, the wind speed decreases with the increase of the height of embankment At the windward slope shoulder and the leeward ground, the wind speed increases with the increase of the height of embankment...