| 沙尘暴过程中颗粒对化学结皮的冲蚀破坏 |
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| 引用本文： | 岳高伟,贾慧娜.沙尘暴过程中颗粒对化学结皮的冲蚀破坏[J].地球科学进展,2012,27(7):800-805. |
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| 作者姓名： | 岳高伟 贾慧娜 |
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| 作者单位： | 河南理工大学土木工程学院,河南焦作,454000 |
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| 基金项目： | 河南省重点学科资助项目“工程力学”，河南教育厅自然科学研究计划项目“土壤风蚀对农田危害的多场耦合复杂力学系统研究” |
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| 摘 要： | 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20 mm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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| 关 键 词： | 化学结皮 量纲分析 本构关系 风蚀 粒—床碰撞模型 |
Erosion Destruction of Chemical Crust in Dust Storm |
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| Yue Gaowei,Jia Huina.Erosion Destruction of Chemical Crust in Dust Storm[J].Advance in Earth Sciences,2012,27(7):800-805. |
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| Authors: | Yue Gaowei Jia Huina |
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| Institution: | School of Civil Engineering, He’nan Polytechnic University, Jiaozuo454000, China |
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| Abstract: | Crust is a compact soil layer which distributes widely in arid and semi arid region to resist wind erosion.In this paper the model of crust destruction in wind erosion is suggested to study the crust destruction mechanics,and crust life length is forecasted.Dimensional analysis is applied to establish the constitutive equation of crust wind erosion volume with sand continuous impacting.The numerical calculation results show that crust life length is effected obviously by sand impacting velocity,sand rotational angular velocity,sand impacting angle,sand diameter,dust-storms datasets and its duration.Through statistic analysis and calculation with above influencing factors,the crust life length is 3~8 years and 5.3 years average when the crust thickness is 20 mm.This research can make people more deeply understand natural destruction features of crust,which has important theoretical significance and practical application value in sand-protecting and sand-binding. |
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| Keywords: | Chemical crust Dimensional analysis Constitutive relationship Wind erosion Particle-bed col- lision model |
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