Wind-Tunnel Studies on Sand Sedimentation Around Wind-Break Walls of Lanxin High-Speed Railway II and Its Prevention

Dun, Hongchao; Xin, Guowei; Huang, Ning; Shi, Guozhen; Zhang, Jie

doi:10.3390/app11135989

Cited by 17 publications

(8 citation statements)

References 22 publications

(24 reference statements)

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“…Simulation experiments in wind tunnels should generally satisfy the principles of geometric similarity, kinematic similarity, and dynamic similarity [ 22 , 23 ]. In this wind tunnel experiment, the sand used was taken from the original surface sand of the desert, conforming to geometric similarity.…”

Section: Methodsmentioning

confidence: 99%

Characteristic Differences of Wind-Blown Sand Flow Field of Expressway Bridge and Subgrade and Their Implications on Expressway Design

Xie

Zhang

Pang

2022

Sensors

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Bridges and subgrades are the main route forms for expressways. The ideal form for passing through sandy areas remains unclear. This study aims to understand the differences in the influence of expressway bridges and subgrades on the near-surface blown sand environment and movement laws, such as the difference in wind speed and profile around the bridge and subgrade, the difference in wind flow-field characteristics, and the difference in sand transport rate, to provide a scientific basis for the selection of expressway route forms in sandy areas. Therefore, a wind tunnel test was carried out by making models of a highway bridge and subgrade and comparing the environmental effects of wind sand on them. The disturbance in the bridge to near-surface blown sand activities was less than that of the subgrade. The variation ranges of the wind speed of the bridge and its upwind and downwind directions were lower than those of the subgrade. However, the required distance to recover the wind speed downwind of the bridge was greater than that of the subgrade, resulting in the sand transport rate of the bridge being lower than that of the subgrade. The variation in the wind field of the subgrade was more drastic than that of the bridge, but the required distance to recover the wind field downwind of the bridge was greater than that of the subgrade. In the wind speed-weakening area upwind, the wind speed-weakening range and intensity of the bridge were smaller than those of the subgrade. In the wind speed-increasing area on the top of the model, the wind speed-increasing range and intensity of the bridge were smaller than those of the subgrade. In the wind-speed-weakening area downwind, the wind speed weakening range of the bridge was greater than that of the subgrade, and the wind speed-weakening intensity was smaller than that of the subgrade. This investigation has theoretical and practical significance for the selection of expressway route forms in sandy areas.

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Section: Methodsmentioning

confidence: 99%

Characteristic Differences of Wind-Blown Sand Flow Field of Expressway Bridge and Subgrade and Their Implications on Expressway Design

Xie

Zhang

Pang

2022

Sensors

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“…The synchronizer was able to keep the frequency of laser emission consistent with the frequency of camera shooting, and the computer with the image acquisition card could control the experiment process and save the pictures taken by connecting with the synchronizer and camera. The pictures were spliced and processed via the particle tracking velocimetry (PTV) method to obtain the particle velocity and number distribution [46].…”

Section: Observation Equipment and Particle Samplesmentioning

confidence: 99%

Experimental Study of Particle Transport and Deposition Distribution over Complex Terrains Based on Spherical Alumina

Liu,

Zhang,

Dun

et al. 2023

Atmosphere

Self Cite

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The transport and deposition of atmospheric particulate matter have attracted significant attention recently due to the increasing frequency of extreme disaster events, such as dust storms, volcanic eruptions, and extensive forest fires. The size distribution of the transported material and the conditions of the land–air interface are dominant factors in comprehending the detrimental potential of atmospheric particulate matter. However, it is still a challenge to understand the mechanism of dust deposition, especially over complex terrain. In an effort to investigate the deposition characteristics of particles over complex terrain, a series of experiments were conducted in a multifunctional environmental wind tunnel. The results show that the wind speed directly above the top of the mild slope model is significantly greater than that in the steep slope model, which indicates that a steep slope has a greater blocking effect on wind fields. At low wind speeds, the average wind speed at the top of the mild slope model is 17.8% higher than that at the top of the steep slope model, and at high wind speeds the average wind speed at the top of the mild slope model is 8.6% higher than that at the top of the steep slope model. The influence trend of the steep slope model and the combination model is basically the same, with both decreasing first and then increasing with the direction of wind velocity. The amount of surface deposition is greatly affected by the location of the feeding point and the microscale characteristics of the surface. In the steep slope model, the deposition is mainly distributed on the windward side, while the leeward side has a small amount of deposition. In the mild slope model, particles are deposited not only on the windward side, but also on the leeward side. The average rate of decline in deposition flux in the steep slope model is 88.4% and 75.1% in the mild slope model. The use of the combination model reduces the particle concentration at the back end compared with the single model. In three different models, the deposition on the windward side was shown to be significantly greater than that on the leeward side of the model. Our work increases understanding of the deposition of coarse dust particles over complex terrain and provides basic data for improving the accuracy of large-region particle transport and deposition simulations.

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“…It limits economic development and ecological stability between regions. It has been a pressing issue to solve how to effectively use engineering sand control measures to improve the sandy environment in desertified areas [4,5].…”

Section: Introductionmentioning

confidence: 99%

Optimization Study on the Design Parameters of Sand Barriers along the Hami-Lop Nor Railway Line

Zheng

Zhang

et al. 2023

Sustainability

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In order to solve the current problems of the single effect of traditional sand control measures, the high cost of cleaning and maintenance, and the inability to provide long-term sustainable protection, this paper proposes a new type of sand barrier with the dual effect of sand conduction and sand blocking. Through field research of wind and sand disasters along the Hami-Lop Nor Railway, wind tunnel testing and numerical simulation of the new sand barrier, the wind velocity flow field, wind speed variation curve, wind protection effectiveness and sand barrier retention rate of the new sand barrier under different design parameters were studied. The results show that the sand barrier with 10H spacing (H is the height of the sand barrier) has the worst sand guiding and blocking effect. The sand barriers with 6H and 8H spacing have less difference in sand guiding and sand blocking effects. Both of them are better than the sand barrier with 10H spacing. The sand blocking effect of the new sand barrier was proportional to the angle (α). The sand guide effect was the opposite. When the angle is certain, the greater the wind speed and the better the sand guide effect. The results show that the new sand barrier is different from the traditional sand barrier in that it has both sand guiding and sand blocking functions, which provides a new method and scientific basis for sand damage control of Hami-Lop Nor Railway.

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Wind-Tunnel Studies on Sand Sedimentation Around Wind-Break Walls of Lanxin High-Speed Railway II and Its Prevention

Cited by 17 publications

References 22 publications

Characteristic Differences of Wind-Blown Sand Flow Field of Expressway Bridge and Subgrade and Their Implications on Expressway Design

Characteristic Differences of Wind-Blown Sand Flow Field of Expressway Bridge and Subgrade and Their Implications on Expressway Design

Experimental Study of Particle Transport and Deposition Distribution over Complex Terrains Based on Spherical Alumina

Optimization Study on the Design Parameters of Sand Barriers along the Hami-Lop Nor Railway Line

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