多孔固沙砖机械沙障防风固沙效果的风洞试验研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (19) : 266-274.

论文

孙婧1,2，王君1，王海龙1,3，洪俊哲1，张少云1

作者信息 +

Wind tunnel test study on windbreak and sand fixing effect of porous sand fixing brick grid mechanical sand barrier

SUN Jing1,2, WANG Jun1, WANG Hailong1,3, HONG Junzhe1, ZHANG Shaoyun1

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文章历史 +

摘要

针对鱼卡至一里坪线新建地方铁路工程，设计了一种多孔固沙砖方格机械沙障作为本线的风沙防护措施。基于风洞试验，通过净风下0°～90°不同铺设角度的沙障风压分布及其变化特点研究，得到最优铺设角度工况；进而在风沙条件下分析了最优工况时沙障的防风固沙效果。结果表明：净风条件下，多孔固沙砖沙障所受风压呈对称分布，沙障边缘处平均风压系数波动较中部位置处大；且沙障所受风压对铺设角度变化敏感，0°～15°铺设角度内，多孔固沙砖沙障平均风压系数稳定，受压较小，是最优铺设角度范围；风沙条件下，在最优铺设角度0°时，障后风速衰减明显，沙粒主要被阻拦在第1排固沙砖前，而穿过孔洞和翻越的沙粒依次沉降在不同排数的方格内；第１排固沙砖后方格内平均沙粒沉积率为116.75 g/（m2•s），占方格总积沙量的88%，固沙效果最明显。

Abstract

As a wind and sand protection measure, a porous sand-fixing brick square mechanical sand barrier was designed as part of the newly constructed local railroad project, Yuca-Yiliping. Based on the wind tunnel test, through the study on the wind pressure distribution and its variation characteristics of sand barrier at different laying angles from 0° to 90° under pure wind, the optimal laying angle working condition was obtained. Furthermore, under the condition of wind-sand, the wind and sand fixation effect of the sand barrier under the optimal working conditions was analyzed.The results show that the wind pressure on the sand barrier is symmetrically distributed under pure wind conditions, and the average wind pressure coefficient at the edge of the sand barrier fluctuates more than that at the middle position; the wind pressure on the sand barrier is sensitive to the change of laying angle, and the average wind pressure coefficient on the sand barrier is stable and less pressurized from 0° to 15° laying angle , It is the optimal range of laying angles; under the wind-sand conditions, when the optimal laying angle is 0 °,the wind speed behind the barrier attenuates obviously ;the sand grains are mainly deposited in front of the 1st row of sand-fixing bricks, while the sand grains passing through the holes and overturning settle in different rows of squares in turn; the average sand deposition rate in the squares after the 1st row of sand-fixing bricks is 116.75 g/(m2 s), accounting for 88% of the total sand accumulation in the squares, with sand fixing being the most obvious effect.

导出引用

孙婧1,2，王君1，王海龙1,3，洪俊哲1，张少云1. 多孔固沙砖机械沙障防风固沙效果的风洞试验研究[J]. 振动与冲击, 2023, 42(19): 266-274

SUN Jing1,2, WANG Jun1, WANG Hailong1,3, HONG Junzhe1, ZHANG Shaoyun1. Wind tunnel test study on windbreak and sand fixing effect of porous sand fixing brick grid mechanical sand barrier[J]. Journal of Vibration and Shock, 2023, 42(19): 266-274

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