挡沙堤—固沙砖综合型体系防风固沙效果的数值模拟

孙婧; 李家园; 刘勇智; 张少云; 刘宏波; 郑瑞海

doi:10.13961/j.cnki.stbctb.2022.04.018

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挡沙堤—固沙砖综合型体系防风固沙效果的数值模拟

试验研究

- 挡沙堤—固沙砖综合型体系防风固沙效果的数值模拟
- Numerical Simulation of Windbreak and Sand Fixation Effects of an Integrated Sand-retaining Dike and Sand-fixing Brick System
- 水土保持通报 2022年42卷第4期页码：135-144
- 作者机构：
  
  1. 河北建筑工程学院土木工程学院,河北,张家口,075000
  2. 河北省土木工程诊断、改造与抗灾重点实验室,河北,张家口,075000
  3. 河北省高校道桥结构健康监测与维修加固应用技术研发中心,河北,张家口,075000
  4. 河北省沥青路面工程固废综合利用技术创新中心,河北,张家口,075000
- 作者简介：
- 基金信息：
  
  河北省科技厅重点研发计划项目“冀北风沙地区废弃铁尾矿道路阻沙屏障关键技术研究”（20373802D）;河北省建设科技研究计划项目（2020-266）
- DOI：10.13961/j.cnki.stbctb.2022.04.018
  中图分类号： X820.3
- 纸质出版：2022
- 稿件说明：
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孙婧, 李家园, 刘勇智, 等. 挡沙堤—固沙砖综合型体系防风固沙效果的数值模拟[J]. 水土保持通报, 2022,42(4):135-144.

Sun Jing, Li Jiayuan, Liu Yongzhi, et al. Numerical Simulation of Windbreak and Sand Fixation Effects of an Integrated Sand-retaining Dike and Sand-fixing Brick System[J]. Bulletin of Soiland Water Conservation, 2022, 42(4): 135-144.
孙婧, 李家园, 刘勇智, 等. 挡沙堤—固沙砖综合型体系防风固沙效果的数值模拟[J]. 水土保持通报, 2022,42(4):135-144. DOI： 10.13961/j.cnki.stbctb.2022.04.018.

Sun Jing, Li Jiayuan, Liu Yongzhi, et al. Numerical Simulation of Windbreak and Sand Fixation Effects of an Integrated Sand-retaining Dike and Sand-fixing Brick System[J]. Bulletin of Soiland Water Conservation, 2022, 42(4): 135-144. DOI： 10.13961/j.cnki.stbctb.2022.04.018.

摘要

[目的] 针对河北省张家口市坝上地区风沙流对公路造成的沙埋问题，建立了挡沙堤—固沙砖综合型防风固沙体系，并对其防风固沙效果进行分析，以期为公路风沙灾害防治提供相关技术参数。[方法] 利用ANSYS软件对挡沙堤周围流场变化、沙粒运动轨迹、固沙砖沙障间距以及固沙砖沙障周围积沙情况进行数值模拟研究，评价挡沙堤—固沙砖综合体系的防风固沙效果。[结果] ①风沙流经过挡沙堤时，会在其周围形成减速区、加速区、紊流区和恢复区，通过风沙流减速区流场分析得到，边坡率为1∶1.2的挡沙堤防风固沙效果最佳。②利用离散相模型(DPM)模拟了沙粒跃移挡沙堤的运动轨迹。当风速为12～20 m/s时，沙粒落点在距挡沙堤11～21 m的位置，进而确定铺设固沙砖沙障的相对位置。③当固沙砖起始位置距离挡沙堤11 m，铺设成11排，1 m×1 m的方格形式时，固定地表流沙效果最佳。[结论] 挡沙堤—固沙砖综合体系通过“远阻近固”的方式来降低风速，阻挡地表流沙，固沙砖沙障能有效防止翻越挡沙堤沙粒的再次起动，改善公路沙埋现象，保证风沙灾害区域的行车安全。

Abstract

[Objective] In view of the sand burying problem caused by the wind and sand flow on the highway in Bashang area of Zhangjiakou City

Hebei Province

a comprehensive wind and sand fixing system of sand retaining dike sand fixing brick was established

and its wind and sand fixing effect was analyzed

in order to provide relevant technical parameters for the prevention and control of wind and sand disasters on the highway.[Methods] The flow field change around the sand retaining dike

and sand particle movement trajectory

sand-fixing brick spacing

and sand accumulation around the sand-fixing brick were numerically simulated by ANSYS software to evaluate the wind-prevention and sand-fixation effects of the integrated sand-retaining dike and sand-fixing brick system.[Results] ① A deceleration zone

an acceleration zone

a turbulence zone

and a recovery zone were formed around the sand-retaining dike as wind and sand passed through it. The sand-retaining dike with a slope ratio of 1:1.2 had the most effect on slowing wind and fixing sand. ② A discrete phase model (DPM) was used to simulate the trajectory of sand jumping on the sand-retaining dike. When the wind speed is 12~20 m/s

the sand falling point was 11~21 m away from the sand-retaining dike

and then the relative position of laying the sand-fixing brick was determined. ③ When the starting position of sand-fixing bricks was 11 m away from the sand-retaining embankment

and they were laid in 11 rows in a square form of 1 m×1 m

then the effect of fixing surface quicksand was the best.[Conclusion] The integrated sand-retaining dike and sand-fixing brick system reduced the wind speed and blocked the surface quicksand by "far-resistance and near-fixation". The sand-fixing brick barrier can effectively prevent the restart of sand particles crossing the sand retaining dike

thereby decreasing the occurrence of highway sand burial

and ensuring driving safety in wind and sand disaster areas.

关键词

Keywords

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