格库铁路HDPE板栅栏有效防护距离

张凯; 王起才; 张兴鑫; 赵沛雯

doi:10.19818/j.cnki.1671-1637.2020.05.008

格库铁路HDPE板栅栏有效防护距离

doi: 10.19818/j.cnki.1671-1637.2020.05.008

张凯^{1, 2,},
王起才^{1, 2, ,},
张兴鑫¹,
赵沛雯³

1.
兰州交通大学土木工程学院, 甘肃兰州 730070
2.
兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室, 甘肃兰州 730070
3.
兰州交通大学经济管理学院

基金项目:

长江学者和创新团队发展计划项目 IRT_15R29

甘肃省高等学校创新基金项目 2020A-45

兰州交通大学青年科学基金项目 2018016

详细信息

作者简介:
张凯(1988-), 男, 山东潍坊人, 兰州交通大学讲师, 工学博士, 从事路基风沙防护研究

王起才：WANG Qi-cai (1962-), male, professor, PhD, 13909486262@139.com

通讯作者:
王起才(1962-), 男, 河北晋州人, 兰州交通大学教授, 工学博士

中图分类号: U216.413
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- 被引次数: 0
出版历程
- 收稿日期: 2020-04-24
- 刊出日期: 2020-10-25

Effective protection distance of HDPE board fence in Golmud-Korla Railway

ZHANG Kai^{1, 2
,},
WANG Qi-cai^{1, 2
, ,},
ZHANG Xing-xin¹,
ZHAO Pei-wen³

1.
School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China
2.
National and Provincial Joint Engineering Laboratory of Road and Bridge Disaster Prevention and Control, Lanzhou Jiaotong University
3.
School of Economics and Management, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China

Funds:

Development Plan of Changjiang Scholars and Innovation Team IRT_15R29

Gansu Provincial Higher Education Innovation Fund Project 2020A-45

Lanzhou Jiaotong University Youth Science Foundation Project 2018016

More Information

Author Bio:
ZHANG Kai(1988-), male, lecturer, PhD, zhangkai0212@yeah.net

摘要

摘要: 以格库铁路现场风沙试验段为研究对象, 运用数值模拟方法研究了HDPE板栅栏周围的风沙流场, 给出了不同初始风速下HDPE板栅栏有效防护距离与其孔隙率和高度的关系, 研究结果表明: 气流经过HDPE板栅栏时, 气流速度在栅栏前降低较快, 在栅栏后恢复较快, 经过一段距离后逐渐恢复到初始风速, 气流速度整体呈V形分布, 气流速度增减幅度随HDPE板栅栏孔隙率的增大逐渐减小; 在同一孔隙率下, 初始风速分别为6、24 m·s^-1时, HDPE板栅栏背风侧回流区相差4.5倍HDPE板栅栏的高度; 孔隙率为60%时, 最小气流速度为8.9 m·s^-1, HDPE板栅栏背风侧回流消失; 随着HDPE板孔隙率的增大, 最小气流速度逐渐增大; HDPE板栅栏的孔隙率存在不产生栅栏背风侧回流区的界限孔隙率, 为40%~60%;孔隙率小于50%时, 随着HDPE板孔隙率的增大, 有效防护距离逐渐增大, 孔隙率大于50%时, 随着HDPE板孔隙率的增大, 有效防护距离逐渐减小, 当孔隙率趋于100%时, 其有效防护距离趋于0, 因此, HDPE板栅栏的最优孔隙率为50%;随着高度的增加, HDPE板栅栏背风侧恢复到初始风速的距离增加, 同一风速下, 孔隙率为50%的HDPE板栅栏的有效防护距离是孔隙率为25%的HDPE板栅栏的1.35倍; 在现场布设HDPE板栅栏时建议使用40%~50%孔隙率的栅栏, 在经济条件允许的情况下可考虑适当增加栅栏高度, 以保证路基免受风沙侵蚀。
- 铁路 /
- 栅栏 /
- 孔隙率 /
- 高度 /
- 数值模拟 /
- 有效防护距离
Abstract: The field sand test section of the Golmud-Korla Railway was taken as the research object, and the sand flow field around the HDPE board fence was studied through the numerical simulation. The relationships between the effective protection distance of HDPE board fence and its porosity and height under different initial wind speeds was given. Research result shows that when the air flow passes through the HDPE board fence, the air flow speed decreases rapidly in front of the fence, and recovers quickly after the fence. After a certain distance, it gradually returns to the initial wind speed. The air flow speed is distributed in a V shape. The trends of air flow speed reduction and increase gradually decrease with the increase of the porosity of HDPE board fence. Under the same porosity, when the initial wind speed is 6, 24 m·s^-1, respectively, the difference between the recirculation zone on the leeward side of HDPE board fence is 4.5 times of the height of HDPE board fence. When the porosity is 60%, the minimum air wind speed is 8.9 m·s^-1, and the backflow on the leeward side of HDPE board fence disappears. As the porosity of HDPE board fence increases, the minimum air flow speed gradually increases. The porosity of HDPE board fence has a limit porosity that the leeward side of fence does not occur, which is 40%-60%. When the porosity is less than 50%, the effective protection distance increases gradually as the porosity of HDPE board increases. When the porosity is greater than 50%, as the porosity of HDPE board increases, the effective protection distance decreases gradually. When the porosity tends to 100%, its effective protection distance is almost 0. Therefore, the optimal porosity of HDPE board fence is 50%. As the height increases, the distance of returning to the initial wind speed after the fence increases. Under the same wind speed, the effective protection distance of HDPE board fence with 50% porosity is 1.35 times of that with 25% porosity. The HDPE board fence with 40%-50% porosity is suggested to use when installing on site. The height of fence should appropriately increase if the economy permits, so as to ensure the roadbed being free from the sand erosion.
- railway /
- fence /
- porosity /
- height /
- numerical simulation /
- effective protection distance

HTML全文

图 1 新建格库铁路路基积沙

Figure 1. New Golmud-Korla Railway subgrade sand accumulation

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图 2 结构性网格

Figure 2. Structural meshes

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图 3 孔隙率为10%时HDPE板栅栏周围气流速度变化曲线

Figure 3. Change curves of air flow speed around HDPE board fence when porosity is 10%

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图 4 孔隙率为25%时HDPE板栅栏周围气流速度变化曲线

Figure 4. Change curves of air flow speed around HDPE board fence when porosity is 25%

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图 5 孔隙率为40%时HDPE板栅栏周围气流速度变化曲线

Figure 5. Change curves of air flow speed around HDPE board fence when porosity is 40%

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图 6 孔隙率为60%时HDPE板栅栏周围气流速度变化曲线

Figure 6. Change curves of air flow speed around HDPE board fence when porosity is 60%

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图 7 栅栏高度为0.5 m时HDPE板栅栏周围气流速度变化曲线

Figure 7. Change curves of air flow speed around HDPE board fence when fence height is 0.5 m

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图 8 栅栏高度为1.0 m时HDPE板栅栏周围气流速度变化曲线

Figure 8. Change curves of air flow speed around HDPE board fence when fence height is 1.0 m

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图 9 栅栏高度为2.0 m时HDPE板栅栏周围气流速度变化曲线

Figure 9. Change curves of air flow speed around HDPE board fence when fence height is 2.0 m

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图 10 栅栏高度为3.0 m时HDPE板栅栏周围气流速度变化曲线

Figure 10. Change curves of air flow speed around HDPE board fence when fence height is 3.0 m

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图 11 有效防护距离与HDPE板孔隙率的关系

Figure 11. Relationship between effective protection distance and porosity of HDPE board

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图 12 有效防护距离与栅栏高度的关系

Figure 12. Relationship between effective protection distance and height of fence

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图 13 HDPE板栅栏

Figure 13. HDPE board fence

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图 14 梯度式风速监测仪

Figure 14. Gradient wind speed monitor

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图 15 现场气象站

Figure 15. On-site weather station

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图 16 试验段HDPE板栅栏周围气流速度变化曲线

Figure 16. Change curves of air flow speed around HDPE board fence in test section

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