Study On Laws Of Wind Erosion In Zhunger-Shuozhou Railway

As the development and construction projects, railway construction has inevitable impacted on the ecological environment. Simultaneously, the railway would be subject to wind damage during operation of the railway project, which can also easily cause soil erosion along the railway. As Zhunger-Shuozhou railway for example, this thesis further studies the laws of wind erosion. Conclusions as follows:1. Wind speed at the different measuring points of embankment cross-section varies relative to the control. The speed of air current decelerates close to the surface on the windward side within a certain range, and at the toe of the embankment the wind speed is minimum, it's reducing is 20%-30%. Then it grows up on the slope from the toe, reaching the maximum on the shoulder. Similarly, wind speed decelerates gradually from the shoulder to the toe.2. Wind speed various at the measuring points of cutting because of terrain change. The wind speed decelerates from the shoulder to the toe on the leeward side, and it increases gradually from the shoulder to the toe on the windward side.3. At every measuring points in areas of embankment, cutting and spoil ground, sand collection decreases with increasing height at a special height, when over the height, it decreases weaken or remains the same extent. The height depends on various factors such as underlying surface properties and wind speed. When the wind speed ranges from 2m/s to 9m/s, it is as smaller as the accumulative sand collecting amount is greater at lower height. Besides, the relationship of power function between wind speed and sediment discharge is much more obvious with bigger wind speed.4. There is a very close relationship between sand grain sizes collected in sandbox and underlying surface properties on the coming direction of wind. When silt soil exists on this underlying surface, particle grain size centralizes on 0.25-0.5mm,0.075-0.25mm and less than 0.075mm. Moreover, for disturbed measure points, its On-site up sediment amount is far greater than sediment amount by air.