| 沙漠公路风沙土路基风蚀破坏试验研究 |
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| 引用本文： | 李驰,高瑜.沙漠公路风沙土路基风蚀破坏试验研究[J].岩土力学,2011,32(1):33-38. |
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| 作者姓名： | 李驰 高瑜 |
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| 作者单位： | 内蒙古工业大学 土木工程学院，呼和浩特 010051 |
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| 基金项目： | 国家自然科学基金项目（No. 50868010）；内蒙自然科学基金项目（No. 2009BS0704）。 |
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| 摘 要： | 以沙漠公路风沙土路基为研究对象，通过室内风蚀风洞试验研究路基的风蚀破坏规律，以及路基不同断面对风沙流运动的影响。以路基高度、路基边坡坡率和路基宽度作为路基断面主要设计参数，研究不同路基断面下风沙流扰动、增速、减速、恢复的过程，以及路基周围风速流场的变化特征，分析路基病害较未病害时路基周围流场的变化。试验结果表明：路基高度和边坡坡率对风沙流运动的影响较大。随路基高度增加，路基对风沙流流场扰动增强，迎风坡坡顶处吹蚀破坏和背风坡坡底处堆蚀破坏越显著，在确定的路基边坡坡率下，路基模型高度为250 mm较模型高度为60 mm时，迎风坡坡顶风速增加1.13倍，背风坡坡底风速减小2.53倍，建议沙漠公路路基高度宜小于2.5 m。进一步，在确定的路基高度下，比较不同的边坡坡率对路基沿程风速的影响，发现当路基边坡坡率为1:1.75时，路基沿程风速变化不明显，沙漠公路风沙土路基不宜被风蚀破坏。
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| 关 键 词： | 环境岩土工程 沙漠公路 风沙流 风蚀 路基断面 室内风蚀风洞试验 |
| 收稿时间： | 2010-02-21 |
Experimental studies of wind erosion failure of aeolian soils subgrade for desert highway |
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| LI Chi,GAO Yu.Experimental studies of wind erosion failure of aeolian soils subgrade for desert highway[J].Rock and Soil Mechanics,2011,32(1):33-38. |
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| Authors: | LI Chi GAO Yu |
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| Institution: | College of Civil Engineering, Inner Mongolia University of Technology, Huhhot 010051, China |
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| Abstract: | Wind erosion failure law of aeolian soils subgrade and the influence of the different subgrade design cross-sections on wind-blown sand are studied through interior wind erosion wind tunnel test. The wind-blown sand’s process of disturbance, accelerating, speed-down, and recovery in different subgrade cross-sections are studied; the characteristic of wind-blown sand field around subgrade are summarized for subgrade defect and subgrade non-defect. The influence factor on the wind erosion failure of aeolian soils subgrade is analyzed. The results indicate that the effect of subgrade height and slope gradient on the wind-blown sand field is obvious; while the change of subgrade’s width can’t affect the flow field notably. The disturbance to the flow field enhances with the increase of subgrade’s height, blow erosion on the top of the windward slope is severe; and heap erosion destroy is brought to the bottom of leeward slope. When subgrade model height is 250 mm compared with that of 60 mm, the wind speed on the top of windward slope increase 1.13 times and decrease 2.53 times at bottom of leeward slope for the certain side slope rate. So subgrade height should less than 2.5m to avoid the wind erosion failure of desert highway. Further, the influence of the different side slope rate on wind-blown sand is analyzed for the certain subgrade height. The change of the wind speed is unconspicuous when the side slope gradient is 1:1.75, the wind erosion failure of aeolian soils subgrade is neglectable. |
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| Keywords: | geoenvironmental engineering desert highway wind-blown sand wind erosion subgrade sections interior wind erosion wind tunnel test |
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