摘要
通过对兰新第2双线试验段不同类型挡沙墙前后风沙流场的现场观测,研究斜插板挡沙墙风沙防治原理及效果。研究结果表明:风沙流途经挡沙墙后,会在墙体背风侧出现一个明显的低速沉沙区,斜插板挡沙墙对风能的消减能力要略高于插板式挡沙墙,其风能最大消减率约为86%。挡沙墙的阻沙率随高度的增加呈负相关变化,当高度超过挡沙墙高度后,挡沙墙对上层气流的扰动明显变弱,斜插板挡沙墙的阻沙效果明显优于插板式挡沙墙,2.0m高斜插板挡沙墙的累计阻沙率约为43.32%。风沙流经过斜插板挡沙墙后,大风所携沙砾的粒径百分比会发生一定的改变,沙砾粒径中细组分的含量明显增加,但整体依然以0.1～0.25mm和小于0.075mm粒径的沙砾为主。
Through field observations on the wind-sand flow fields in front and at the back of different retaining walls along the test section of the second double-track of Lanzhou-Xinjiang Railway,the principles and effects of the retaining wall with inclined plank for the prevention and treatment of wind drift sand were researched.The results show that,after sand-driving wind passing the retaining wall,there is an obvious low-speed desilting area at the leeward side of the retaining wall.The wind energy dissipation of the retaining wall with inclined plank is slightly higher than that of the plank inserted retaining wall,and its maximum wind energy dissipation rate is about 86%.Negative correlations are discovered between the sand blocking rate and the height of retaining wall.Once the height exceeds the retaining wall,the disturbance of retaining wall on the upper air flow obviously weakens.The sand blocking effect of the retaining wall with inclined plank is much superior to that of the plank inserted retaining wall,and the accumulative sand blocking rate of 2.0 m retaining wall with inclined plank is about 43.32%.After sand-driving wind passing the retaining wall with inclined plank,certain changes occur to the grain size percentage of the sand carried by strong wind.The percentage of fine particles in sand obviously increases,but the sizes of most sand particles are still between 0.1 to 0.25 mm and less than 0.075 mm.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2013年第2期46-51,共6页
China Railway Science
基金
铁道部科技研究开发计划项目(2010G019-H)
新疆维吾尔自治区重大科技专项资助项目(201130106-3)
关键词
铁路
风沙防治
斜插板挡沙墙
风沙流
阻沙率
现场试验
Railway
Prevention and treatment of wind drift sand
Retaining wall with inclined plank
Sand-driving wind
Sand blocking rate
Field experiment
