| 格库铁路HDPE板栅栏有效防护距离 |
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| 引用本文： | 张凯,王起才,张兴鑫,赵沛雯.格库铁路HDPE板栅栏有效防护距离[J].交通运输工程学报,2020,20(5):105-115. |
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| 作者姓名： | 张凯 王起才 张兴鑫 赵沛雯 |
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| 作者单位： | 1.兰州交通大学 土木工程学院, 甘肃 兰州 7300702.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 7300703.兰州交通大学经济管理学院 |
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| 基金项目： | 国家自然科学基金;创新基金;创新团队发展计划;长江学者 |
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| 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。
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| 关 键 词： | 铁路 栅栏 孔隙率 高度 数值模拟 有效防护距离 |
| 收稿时间： | 2020-04-24 |
Effective protection distance of HDPE board fence in Golmud-Korla Railway |
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| ZHANG Kai,WANG Qi-cai,ZHANG Xing-xin,ZHAO Pei-wen.Effective protection distance of HDPE board fence in Golmud-Korla Railway[J].Journal of Traffic and Transportation Engineering,2020,20(5):105-115. |
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| Authors: | ZHANG Kai WANG Qi-cai ZHANG Xing-xin ZHAO Pei-wen |
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| Affiliation: | 1.School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China2.National and Provincial Joint Engineering Laboratory of Road and Bridge Disaster Prevention and Control, Lanzhou Jiaotong University3.School of Economics and Management, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China |
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| 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. |
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