格库铁路不同固沙措施的防护效益
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摘要
[目的]确定格库铁路沿线最佳固沙措施,为沿线固沙措施布设提供理论依据。[方法]通过流体仿真(ANSYS fluent)模拟格库铁路沿线高密度聚乙烯(high density polyethylene,HDPE)板和固化沙垄方格周围的流场变化、防护距离和积沙形态变化过程。[结果]当气流通过HDPE板和固化沙垄方格时,在其周围形成6个速度分区:迎风侧低速区、遇阻抬升区、集流加速区、第1减速区、第2减速区和速度恢复区;在同等风速条件下,同一高度处固化沙垄方格的有效防护距离大于HDPE板的有效防护距离;HDPE板和固化沙垄方格内的积沙随时间动态变化,透风型HDPE板防沙形式以板内固沙为主,不透风型固化沙垄方格以沙垄前阻沙为主。[结论]综合考虑,HDPE板方格的经济性实用性以及防沙效果更好。
[Objective]To obtain the best sand-fixing measures along the Geku railway in order to provide a theoretical basis for the deployment of sand-fixing measures along the line.[Methods]The ANSYS fluent numerical simulation was used to study the change of flow field,the protective distance,the sand accumulation process of high density polyethylene(HDPE)board and the hardened sand square grid.[Results]The results showed that when the airflow passed through the HDPE board and hardened sand square grid,six velocity zones were formed including:low air speed zone at windward side,air flow uplift zone,air flow accelerated zone,the first air flow deceleration zone,the second air flow deceleration zone and air flow speed recovery area zone.At the same height,the effective protection distance of hardened sand square grid was greater than that of HDPE board under the same wind speed.The sand accumulation in the HDPE board and hardened sand square grid were dynamic processes.Sand control form of ventilated HDPE board and non-ventilated hardened sand square grid were dominated by sand accumulation and sand resistance.[Conclusion]The economical practicality and the sand control effect of HDPE board were better.
[Objective]To obtain the best sand-fixing measures along the Geku railway in order to provide a theoretical basis for the deployment of sand-fixing measures along the line.[Methods]The ANSYS fluent numerical simulation was used to study the change of flow field,the protective distance,the sand accumulation process of high density polyethylene(HDPE)board and the hardened sand square grid.[Results]The results showed that when the airflow passed through the HDPE board and hardened sand square grid,six velocity zones were formed including:low air speed zone at windward side,air flow uplift zone,air flow accelerated zone,the first air flow deceleration zone,the second air flow deceleration zone and air flow speed recovery area zone.At the same height,the effective protection distance of hardened sand square grid was greater than that of HDPE board under the same wind speed.The sand accumulation in the HDPE board and hardened sand square grid were dynamic processes.Sand control form of ventilated HDPE board and non-ventilated hardened sand square grid were dominated by sand accumulation and sand resistance.[Conclusion]The economical practicality and the sand control effect of HDPE board were better.
引文
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[12]周娜,张春来,田金鹭,等.半隐蔽式草方格沙障凹曲面形成的流场解析及沉积表征[J].地理研究,2014,33(11):2145-2156.
[13]刘世海,冯玲正,许兆义.青藏铁路格拉段高立式沙障防风固沙效果研究[J].铁道学报,2010,32(1):133-136.
[14]Qu Jianjun,Zu Ruiping,Zhang Kecun.Field observations on the protective effect of semi-buried checkerboard sand barriers[J].Geomorphology,2007,88(1/2):193-200.
[15]屈建军,喻文波,秦晓波.HDPE功能性固沙障防风效应试验[J].中国沙漠,2014,34(5):1185-1193.
[16]屈建军,井哲帆,张克存,等.HDPE蜂巢式固沙障研制与防沙效应试验研究[J].中国沙漠,2008,28(4):599-604.
[17]屈建军,凌裕泉,俎瑞平,等.半隐蔽格状沙障的综合防护效益观测研究[J].中国沙漠,2005,25(3):329-335.
[18]张克存,俎瑞平,方海燕.不同孔隙度尼龙网格对风沙流减弱作用的风洞模拟[J].水土保持学报,2004,18(4):4-6.
[2]吴正等.风沙地貌与治沙工程学[M].科学出版社,北京,2010:319-321.
[3]Bruno L,Fransos D,Giudice A L.Solid barriers for windblown sand mitigation:Aerodynamic behavior and conceptual design guidelines[J].Journal of Wind Engineering and Industrial Aerodynamics,2018,173:79-90.
[4]Zaghloul N A.Sand accumulation around porous fences[J].Environmental Modelling and Software,1997,12(2):113-134.
[5]Mcclure S,Kim J JSang J L,et al.Shelter effects of porous multi-scale fractal fences[J].Journal of Wind Engineering and Industrial Aerodynamics,2017,163:6-14.
[6]Gillies J A,Etyemezian V,Nikolich G,et al.Effectiveness of an array of porous fences to reduce sand flux:Oceano Dunes,Oceano CA[J].Journal of Wind Engineering and Industrial Aerodynamics,2017,168:247-259.
[7]Lee S J,Park K C,Park C W.Wind tunnel observation about the shelter effect of porous fences on the sand particle movement[J].Atmospheric Environment,2002,36(9):1453-1463.
[8]孙浩,刘晋浩,黄青青.沙障风荷载作用下嵌固端受力分析[J].农业工程学报,2017,33(2):148-154.
[9]马瑞,刘虎俊,马彦军,等.沙源供给条件对机械沙障固沙作用的影响[J].水土保持学报,2013,27(5):105-108.
[10]李锦荣,孙保平,高永,等.基于空气动力学的沙袋沙障气流场模拟[J].北京理工大学学报,2010,30(6):749-752.
[11]袁鑫鑫,王海峰,雷加强,等.不同间距双排尼龙阻沙网防风效应的风洞模拟[J].中国沙漠,2016,36(5):1238-1246.
[12]周娜,张春来,田金鹭,等.半隐蔽式草方格沙障凹曲面形成的流场解析及沉积表征[J].地理研究,2014,33(11):2145-2156.
[13]刘世海,冯玲正,许兆义.青藏铁路格拉段高立式沙障防风固沙效果研究[J].铁道学报,2010,32(1):133-136.
[14]Qu Jianjun,Zu Ruiping,Zhang Kecun.Field observations on the protective effect of semi-buried checkerboard sand barriers[J].Geomorphology,2007,88(1/2):193-200.
[15]屈建军,喻文波,秦晓波.HDPE功能性固沙障防风效应试验[J].中国沙漠,2014,34(5):1185-1193.
[16]屈建军,井哲帆,张克存,等.HDPE蜂巢式固沙障研制与防沙效应试验研究[J].中国沙漠,2008,28(4):599-604.
[17]屈建军,凌裕泉,俎瑞平,等.半隐蔽格状沙障的综合防护效益观测研究[J].中国沙漠,2005,25(3):329-335.
[18]张克存,俎瑞平,方海燕.不同孔隙度尼龙网格对风沙流减弱作用的风洞模拟[J].水土保持学报,2004,18(4):4-6.