Observation and numerical simulation of the protective effect of the reed-bundle sand control system along the Golmud-Korla Railway
In this study,the evaluation of the sand control efficiency of the reed bundle sand control system in the gobi region of Milan section of Golmud-Korla Railway,Southern Xinjiang,China was carried out through field observation and numerical simulation.The results show that the sand-control systems consisting of two reed bundle fences and a 40 m long belt of large reed checkerboard(4 m×4 m×0.8 m)have a good effect on control-ling damages caused by the gobi wind-blown sand.The maximum windproof efficiency(wind speed attenuation ratio)in the range of 2-14H(H,fence height,2 m)after a single row reed bundle sand fence reached 86％,and the sand blocking efficiency(attenuation ratio of sand flux)ranged between 91.8％and 96.8％.The maximum wind protection efficiency of the double-row sand fence was almost unchangeable,and the sand blocking effi-ciency increased to 98％,while the sand blocking efficiency increased to 99.7％as wind-blown sand flux flowing over the belt of large reed checkerboard.Moreover,as the wind-blown sand flux flowed over the sand control system,the average particle size was significantly reduced from 240 pm to 72-109 pm,and the sorting tended to become better.The measured and simulated results show that the sand control system composed of two reed-bun-dle sand fences with 50％porosity and two large reed-bundle grids(4 m×4 m×0.8 m)can play a good role in sand control,the project cost is relatively low,and the protection system can be applied to the control of sand damage in the gobi wind area of Golmud-Korla Railway.
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