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针对强风区铁路风沙流灾害防治工程,开展最大输沙量和强风携沙风荷载2个最关键工程计算问题的研究。结合现场踏勘资料与测试数据,分析风向、风力和持续时间3个影响因素对最大输沙量矢量合成与计算的控制影响,基于优势强风流理论,归纳给出信风型、季风型和对流型3种典型工程风型的输沙量计算方法,并且为准确采集沙样数据,专门设计出能随主风向自动转动的野外自动风导向积沙仪。基于现场测试数据,根据相似准则与量纲和谐原理,推导强风区携沙风单位体积沙砾颗粒流体平均飞跃速度计算公式,用于强风区携沙风冲击荷载计算,计算结果符合工程实际,满足工程计算要求。
Aiming at the prevention and control of wind-blown sandstorm disaster in the area with strong winds, a study on the calculation of the two most critical projects of maximum sediment load and strong wind-carrying sand load is carried out. Combining with the data and test data of on-the-spot survey, the influence of three influencing factors of wind direction, wind force and duration on the control of maximum sediment concentration vector synthesis and calculation is analyzed. Based on the strong strong wind flow theory, the wind, monsoon and convection patterns Three kinds of typical engineering wind-type sediment load calculation method, and accurate sampling of sand-like data, designed to automatically rotate with the main wind direction of the field of automatic wind-guided sandlogging instrument. Based on the field test data and according to the principle of similarity and dimension harmony, the formula for calculating the mean leap-over velocity of sand-gravel particles per unit volume of sand-carrying wind in a strong wind area is deduced, which is used to calculate the impact load of sand-carrying sand in a strong wind area. The calculated results accord with the actual engineering, Calculate requirements.