›› 2011, Vol. 32 ›› Issue (S1): 642-0647.

• 数值分析 • 上一篇    下一篇

沙漠公路风蚀破坏规律的数值模拟研究

李 驰,高 瑜,黄 浩   

  1. 内蒙古工业大学 土木工程学院,呼和浩特 010051
  • 收稿日期:2010-09-20 出版日期:2011-05-15 发布日期:2011-05-16
  • 作者简介:李驰,女,1973年生,博士,教授,主要从事沙漠环境岩土工程方面的科研工作
  • 基金资助:

    国家自然科学基金项目(No. 50868010);内蒙自然科学基金项目(No. 2009BS0704);教育部科学技术研究重点项目(No. 210036)

Numerical simulation of wind erosion damage rules for desert highway

LI Chi, GAO Yu, HUANG Hao   

  1. College of Civil Engineering, Inner Mongolia University of Technology, Huhhot 010051, China
  • Received:2010-09-20 Online:2011-05-15 Published:2011-05-16

摘要: 通过Fluent软件对沙漠公路的风蚀破坏规律进行数值模拟研究。分析公路不同横断面时风沙流扰动、增速、减速、恢复的过程,确定路基(堑)高度、边坡坡率和路面宽度等公路断面设计参数对风沙流扰动的影响,提出沙漠公路路基(堑)风蚀破坏规律。结果表明:路面宽度的改变对路基沿程风速变化影响较小,各特征点处风速变化小于5%。路基(堑)高度和边坡坡率对风沙流扰动的影响较大。随路基(堑)高度增加,风沙流流场的扰动被增强,路基(堑)风蚀破坏越显著,当边坡坡率为1:1时,路基模型高度250 mm时的迎风路肩风速为模型高度60 mm时的 1.15倍,其背风坡脚风速降低45%;路堑模型高度250 mm时的背风堑顶风速为模型高度60 mm时的1.05倍,迎风堑脚处风速降低高达80%。建议沙漠公路宜采用中低路基(堑),不宜高填深挖。当路基(堑)高度一定,边坡坡率为1:1.75或1:2时,路基(堑)沿程风速变化平缓,沙漠路肩不易被吹蚀破坏;路堑中堑脚位置处不易出现堆积。其结论与室内风蚀风洞试验结果有很好的一致性

关键词: 环境岩土工程, Fluent数值模拟, 沙漠公路, 风蚀破坏

Abstract: Wind erosion damage rules of desert highway are simulated using the Fluent software. The process of disturbance, acceleration, speed-down, and recovery of the sand flow that is obstructed by different highway cross-sections are analyzed. The influences of main cross-section design parameters such as subgrade (cutting) height, slope, and pavement width on the sand flow are determined; and the wind erosion rules of desert highway subgrade (cutting) are proposed. The results indicate that the influence of the pavement width on wind speed variety is slight, the changes of wind speeds at feature points are less than 5%; but the subgrade (cutting) height and slope have great influence on wind speed variety. The disturbance of sand flow field is reinforced with the subgrade (cutting) height increases, the wind erosion damage of subgrade (cutting) is more evidently. While the side slope is 1:1, the wind speed on the shoulder of windward when the subgrade model height is 250 mm is 1.15 times more than the speed when the subgrade model height is 60 mm, but the wind speed on the bottom of leeward slope decreases 45%; the wind speed on the shoulder of windward when the cutting model height is 250 mm is 1.05 times more than the speed when the cutting model height is 60 mm; but the wind speed on the bottom of leeward slope decreases about 80%. So it is suggested that the desert highway should use middle or low height subgrade (cutting) and shouldn’t be filled highly or digged deeply. While the height of subgrade (cutting) is certain, and the side slope is 1:1.75 or 1:2, the change of wind speed along the subgrade (cutting) is gentle; and the accelerate effect of windward shoulder and the speed-down effect of leeward bottom are inconspicuous. At this time, the subgrade isn’t destroyed by wind erosion and the leeward bottom of cutting isn’t changed by accumulation easily. The conclusions drawn from numerical simulating are consistent with the experiment results perfectly.

Key words: geoenvironmental engineering, Fluent numerical simulation, desert highway, wind erosion damage

中图分类号: 

  • TU 443
[1] 李 驰,高 瑜. 沙漠公路风沙土路基风蚀破坏试验研究[J]. , 2011, 32(1): 33-38.
[2] 李 驰,黄 浩,孙兵兵. 风沙环境下沙漠路基风蚀破坏数值模拟研究[J]. , 2010, 31(S2): 378-382.
[3] 胡黎明,邢巍巍,吴照群. 多孔介质中非水相流体运移的数值模拟[J]. , 2007, 28(5): 951-955.
[4] 方江华 ,张志红 ,姜玉松,. 对环境岩土工程几个问题的探讨[J]. , 2005, 26(4): 655-659.
[5] 郝荣福,胡黎明,邢巍巍. 土壤中可挥发性污染物清除的离心试验研究[J]. , 2004, 25(7): 1037-1040.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
[1] 张文杰,陈云敏. 垃圾填埋场抽水试验及降水方案设计[J]. , 2010, 31(1): 211 -215 .
[2] 宫伟力,安里千,赵海燕,毛灵涛. 基于图像描述的煤岩裂隙CT图像多尺度特征[J]. , 2010, 31(2): 371 -376 .
[3] 万 智,董 辉,刘宝琛. 基于正交设计下SVM滑坡变形时序回归预测的超参数选择[J]. , 2010, 31(2): 503 -508 .
[4] 孙曦源,栾茂田,唐小微. 饱和软黏土地基中桶形基础水平承载力研究[J]. , 2010, 31(2): 667 -672 .
[5] 王明年,郭 军,罗禄森,喻 渝,杨建民,谭忠盛. 高速铁路大断面黄土隧道深浅埋分界深度研究[J]. , 2010, 31(4): 1157 -1162 .
[6] 胡勇刚,罗 强,张 良,黄 晶,陈亚美. 基于离心模型试验的水泥土搅拌法加固斜坡软弱土地基变形特性分析[J]. , 2010, 31(7): 2207 -2213 .
[7] 谭峰屹,姜志全,李仲秋,颜惠和. 附加质量法在昆明新机场填料压实密度检测中的应用研究[J]. , 2010, 31(7): 2214 -2218 .
[8] 柴 波,殷坤龙,肖拥军. 巴东新城区库岸斜坡软弱带特征[J]. , 2010, 31(8): 2501 -2506 .
[9] 杨召亮,孙冠华,郑 宏. 基于潘氏极大值原理的边坡稳定性的整体分析法[J]. , 2011, 32(2): 559 -563 .
[10] 王光进,杨春和,张 超,马洪岭,孔祥云,侯克鹏. 超高排土场的粒径分级及其边坡稳定性分析研究[J]. , 2011, 32(3): 905 -913 .