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Cheng, Jian-jun
- Study on Sand-blocking Benefits of Aeolian-Retaining Structures Along the Railway
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1 College of Water Resources and Architectural Engineering, Shihezi University, Shihezi, CN
1 College of Water Resources and Architectural Engineering, Shihezi University, Shihezi, CN
Source
Nature Environment and Pollution Technology, Vol 17, No 2 (2018), Pagination: 349-358Abstract
In view of the frequent occurrence of wind sand disaster in the Gobi area, engineering protection measures aimed at sand-blocking and sand-controlling along the railway are urgently needed to be constantly improved. This paper has analysed the sand-blocking benefits of three aeolian-retaining structures in actual projects through the way of theoretical analysis, wind tunnel test and numerical simulation. The results are as follows: Three engineering measures can reduce the turbulence of the flow and weaken the velocity so that the sand can be deposited easily; under the influence of the solid wall and hanging-style plate sand-retaining wall with 30% porosity, the airflow will form a wide range of vortex zone behind the barrier and there will be an increasing velocity area on the top of the aeolianretaining wall because of the effect of extrusion. So, these two structures can only be used in smaller wind velocity areas (V<12m/s), and it is also needed to take the effects of negative pressure behind the barriers into account. PE net with 55% porosity can form a more stable flow field behind the net and weaken the airflow at the same time, which is conducive to the control of the movement of sand and can avoid the erosion hazards on the ground caused by the eddy current, and the control effect of PE net on the velocity can be increased up to 15H behind the net. Considering the cost, service life and other conditions of the sand-retaining structures in the wild environment, the PE net would occupy an important position in the sand-controlling along the railway.Keywords
Aeolian Disaster, Wind Tunnel Test, Numerical Simulation, PE Net, Wind Profile.Full Text
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