铁路高架桥对局地风动力的影响——以敦格铁路沙山沟为例

he dynamic wind environment characteristics on the east and west sides of the Shashangou Bridgeused by the Dunge Railway were investigated using field observations, indoor analysis, and CFD numericalsimulations. The results show that the sand-driving winds on the east and west sides of Shashangou Bridge weremainly NW and WNW winds in the spring and summer, and SE and S winds in the autumn and winter. Theannual sand transport potential on the west side of Shashangou Bridge is 284.19 VU, which indicates a mediumwind energy environment. The sand transport potential was determined to be 27.4 VU, and the sand transportwith the wind direction was 124 . The directional variability index is 0.10, which indicates a small ratio andvariable wind direction. The sediment transport potential on the east side of Shashangou Bridge is 31.24 VU,indicating a low wind energy environment. The results of the sediment transport potential were 8.97 VU, whilethe results of the sediment transport wind direction were 91 , and the directional variability index was 0.29,indicating a medium ratio. The average wind speed, frequency of sand-driving wind, sand transport potential, andresultant sand transport potential on the west side of Shashangou Bridge were larger, indicating that themonitoring and control of sand damage on the west side of the bridge should be improved. According to thecharacteristics of the wind dynamic environment on the west side of the bridge when combined with the flowingdune, the numerical simulation analysis results show that the wind speed in the overhead area and bridge deck isgreater than the sand- driving wind speed, and the sand transport capacity was strong, indicating that sandaccumulation does not readily occur. However, with the advance of sand dunes, the possibility of sandaccumulation at the bottom of the bridge and wind sand on the rail increases.