高立式尼龙网沙障防风阻沙特征及其合理配置

doi:10.13866/j.azr.2021.03.30

Abstract

Abstract:

High vertical sand barriers are widely used to protect against wind and sand disasters in linear engineering. The layout mode directly affects the efficiency and cost-effectiveness of wind and sand prevention in engineering. On the windward side of Ulan Buh Desert Sand Crossing Highway from Dengkou to Ustai, Inner Mongolia, we have designed two types of sand barriers, namely, single sand barrier with four heights and double sand barrier with four heights and three intervals, which are used to simulate the observation field of wind-sand disaster prevention and control. The ladder sand and HOBO wind speed collectors were used to observe the wind-proof and sand-blocking efficiency parameters under dust storms with different wind speeds. Results showed that under the background of low wind speed (<12 m·s^-1), the effective protection distance behind the high vertical nylon sand barrier net is within 3H for single behavior and 12H for double behavior (Where “H” represents the distance of the same height of sand barrier). The average interception rate of single-row high vertical nylon sand barrier is 85.14% at 3H after barrier and 91.23% at 5H after barrier. The average sand barrier rejection rate of the double-row high vertical nylon sand barrier net is 93.53% at 3H after the barrier. It is not recommended to use sand barriers with a height of 0.6 m or less when nylon sand barriers are deployed in linear engineering protection in the medium and low wind energy areas. A Single-row nylon sand barrier with a height of 1 m can be configured at a wind speed of 8 m·s ^-1 and below. A wind speed of 8-12 m·s^-1 can be configured with double-row nylon sand screens with an interval of 8H and a height of 0.8-1.0 m. In the high wind speed area (>12 m·s^-1), the multi-strip compound configuration of nylon mesh sand barrier with widening distance to 10 H and a height of 1.2 m was selected. This model can optimize the design of sand control projects and improve the sand disaster prevention system of line engineering.

Key words: high vertical sand barrier, windproof benefit, sand blocking rejection rate, configuration optimization

XI Cheng,ZUO Hejun,WANG Haibing,YAN Min,JIA Guangpu. Wind-proof and sand-blocking characteristics of high vertical nylon mesh sand barrier and its rational allocation[J].Arid Zone Research, 2021, 38(3): 882-891.

Figures/Tables 7

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References 30

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沙障高度/m	沙障材料费/(元·m^-1)	沙障固定桩柱费/(元·根^-1)	人工费/(元·m^-1)	铺设长度/km	成本投入/10⁴元
0.60	6.00	5.00	6.00	1	1.45
0.80	8.00	7.15	6.00	1	1.76
1.00	10.00	8.50	6.00	1	2.03
1.20	12.00	10.00	6.00	1	2.30

Wind-proof and sand-blocking characteristics of high vertical nylon mesh sand barrier and its rational allocation

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