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沙尘暴过程中颗粒对化学结皮的冲蚀破坏

DOI: 10.11867/j.issn.1001-8166.2012.07.0800, PP. 800-805

Keywords: 化学结皮,量纲分析,本构关系,风蚀,粒—床碰撞模型

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Abstract:

针对风沙运动中结皮冲蚀破坏及其寿命问题,通过建立沙粒对结皮的冲蚀模型,采用量纲分析研究风沙运动中单颗沙粒对结皮冲蚀量与沙粒冲击速度、沙粒自旋角速度、沙粒直径、沙粒入射角、结皮硬度等的本构关系,并对结皮冲蚀破坏机理及其寿命预测进行理论研究。数值计算结果表明,沙粒冲击速度、沙粒自旋角速度、沙粒冲击角度、沙粒直径及沙尘暴日数、持续时间都对结皮寿命有明显影响。统计分析各项影响因素的平均值计算表明,在结皮厚度20mm的情况下,结皮寿命为3~8年,平均寿命5.3年。此研究可以更深刻认识结皮的自然破坏特征,对防沙固沙具有一定的理论意义和实际应用价值。

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