关键词: 防沙工程, 流场, 阻风效率, 积沙量, 临哈铁路

Abstract:

In order to grasping the protective effect of all kinds of wind-sand protection measures along Linhe-Hami Railway， and optimizing the layout project， the typical sand control engineering areas of the Tiance line K16 and K217， K585， K745 along the Linhe-Hami Railway were selected. The sample belt synchronous observation method and the brazing method were used to measure the wind resistance efficiency and the spatial and temporal distribution of sediment accumulation in each area. The results show that the restraining effect of the sand control engineering on the wind is gradually enhanced from the outside to the inside of the railway， and the amplitude of wind speed increase or decrease is 114%-69%， 44%， 160%-24% and 190%-75% respectively at the sand barrier sand zone of 1.5 m high， cutting of the 2.5 m deep， embankment of 10 m and 16 m high. The wind suppression effect was stronger in the grid protected area than in the sand barrier protected area at the height of 1 m， and the higher the height and side length of the grid， the stronger the wind inhibition effect. In the section with severe sand damage， most of the sand grains were deposited in the 0.5 m grid in the middle of the windward side， and the sand accumulation was the largest at the 1.5 m sand barrier of the section with slight sand damage. Therefore， it is suggested that in the configuration of sand barriers， the medium and severe sand damage sections should be dominated by 0.5 m high sand prevention grid， especially in the Gobi area with abundant sand sources at upwind. the light sand damage section should be dominated by multiple 1.5 m sand barriers， and supplemented by grid measures.

Key words: sand control engineering, flow field, wind suppression efficiency, sand deposition quantity, Linhe-Hami Railway