格库铁路不同固沙措施的防护效益

An Analysis of Protection Benefits of Different Sand-fixing Measures at Geku Railway

[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.