砾漠大风地区铁路路堤风载荷模拟实验研究

An Experinental Study on the Aerodynamic Load of Railway Embankment

利用大气边界层风洞对砾漠大风地区铁路路堤进行风载荷模拟实验研究。实验中较好地满足了相似准则，重现了风区现场实测所获得的大气边界层风特性。通过对模型表面平均和脉动压力的测量以及对模型附近流场的测量。分析研究了路堤风蚀机理，为采取防风蚀的工程措施提供了科学依据。事实证明模拟实验结果是十分有效的。

simulation test on rai1way embankment in ga1e-affected gravel desert areas was carried out making use of an atmospheric bound-ary layer wind tunnel.The test reproduced the wind characteristics observed by on-site measurement and satisfied well the similarity criteria. During the test,the mean surface pressure,the fluctuating pressure and the flow field near the embankment models being tested were measured,simulating an uneroded standard embankment and an embankment that experienced wind erosion for three years before getting stabilized.Using the measured data an analvsis was made of the mechanism of wind erosion to provide a scientific basis for decision-making on protective engineering projects against erosion.The test result has proved very useful.