Zhang Ming, Li Qi, Hou Jiayin, Ji Shuai
Gansu Engineering Design and Research Institute Co., Ltd, Lanzhou, China.
School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, China.
PLoS One. 2025 Aug 8;20(8):e0324869. doi: 10.1371/journal.pone.0324869. eCollection 2025.
As the first barrier of desert highway protection, sand-blocking fence is very important to the safety of the line. Based on the background of Wuma Expressway, this paper uses CFD numerical simulation to study the wind and sand-blocking effect of sand-blocking fence with different heights. The results show that: (1) Between the first and second sand-blocking fences, when the height of sand-blocking fence is 2m, 2.5m, 3.0m and 3.5m, the wind speed near the surface (0.1m ~ 0.3m) is reduced by 87% ~ 97% of the initial wind speed. Between the second and third sand-blocking fences, when the height of sand-blocking fence is 2.5m, the increase of wind speed is 13.87% lower than that of 2m height. The decrease is the largest, and sand particles are easy to deposit here in large quantities. When the height is 2.5m and above, the windbreak efficiency is greater than 90%, and the windbreak effect is significantly improved. (2) The change of sand barrier height has a significant effect on the windbreak efficiency between the second and third sand barriers. (3) Among the three sand-blocking fences, when the height of the sand-blocking fence is 2.5m, the thickness of the sand is 50.51% and 58.33% higher than that of the 2m high sand-blocking fence, and the sand-blocking effect is the most significant. After the height is increased to 3.5m, the thickness of the sand is no longer increased. (4) The height of sand-blocking fence is 2.5m, and the area of sand at the top of embankment is obviously reduced. The area of sand volume fraction 0.55-0.6 is 73.44% lower than that of 2m sand-blocking fence, and the effect of wind and sand prevention is the best.
作为沙漠公路防护的第一道屏障，阻沙栅栏对线路安全至关重要。本文以乌玛高速公路为背景，采用CFD数值模拟方法研究不同高度阻沙栅栏的防风阻沙效果。结果表明：(1)在第一和第二道阻沙栅栏之间，当阻沙栅栏高度为2m、2.5m、3.0m和3.5m时，近地表(0.1m～0.3m)风速降低了初始风速的87%～97%。在第二和第三道阻沙栅栏之间，当阻沙栅栏高度为2.5m时，风速增加量比2m高度时低13.87%。降幅最大，沙粒容易大量在此沉积。当高度为2.5m及以上时，防风效率大于90%，防风效果显著提高。(2)阻沙栅栏高度变化对第二和第三道沙障之间的防风效率有显著影响。(3)在三道阻沙栅栏中，当阻沙栅栏高度为2.5m时，积沙厚度比2m高的阻沙栅栏厚50.51%和58.33%，阻沙效果最显著。高度增加到3.5m后，积沙厚度不再增加。(4)阻沙栅栏高度为2.5m时，路堤顶部积沙面积明显减小。沙体积分数0.55 - 0.6的区域面积比2m阻沙栅栏低73.44%，风沙防治效果最佳。
