Study on Horizontal Curve Radius in Wind-drift Sand Response Rule for Desert Highway
Taking the desert section of Wuhai-Maqin expressway,which runs through the heart of the Tengger Desert,as the study background,based on the Fluent Eulerian model,the numerical simulation of curve embankment for desert highway with different windward forms and radii under blown sand environment is carried out.The influence of windward form and curve radius of the curved surface on the wind-drift sand field structure is systematically analyzed,and the recommended value range of the horizontal curve radius of the desert highway embankment is obtained.Finally,the accuracy of the numerical simulation is verified by combining the sediment accumulation on both sides of the highway embankment in the test section.The result shows that(1)the windward form and curve radius of the surface have little influence on the flow field distribution of the y-section embankment;(2)on the windward side of the embankment,the road embankment with convexity windward horizontal curve has lateral transport effect on wind-drift sand,the strength of lateral dredging is inversely proportional to the radius of horizontal curve,and the conduction effect is not obvious when the convex windward flat curve radius is 3 000 m or above;(3)the concave windward flat curve embankment has a pooling effect on the wind-drift sand,the strength of the pooling effect is also inversely proportional to the size of the flat curve radius,and the pooling effect is not obvious when the radius of the windward flat curve of concave surface is 5 000 m or above;(4)on the leeward side of the embankment,the larger the radius of flat curve,the smaller the range of wind speed recovery zone,and the length of the wind speed recovery zone remains unchanged when the radius of the flat curve reaches 3 000 m or above;(5)therefore,straight lines should be preferred for the horizontal alignment of desert areas,and the radius of the convex windward horizontal curve should not be less than 3 000 m,and the radius of the concave windward horizontal curve should not be less than 5 000 m when considering avoiding obstacles.The study result can provide an effective reference for the selection of plane alignment of desert highway.
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