散粒货物对铁路敞车端墙侧压力研究

Research of Lateral Pressure of Granular Cargo on End Walls of Open Wagon

在经典土压力理论的基础上,运用水平层分析法,分析了散粒货物对铁路敞车端墙极限状态的被动侧压力,并且整体分析了车辆运行时的货物状态。认为静态的侧压力可借鉴文献[10]的主动土压力计算公式,但应用中需考虑振实系数,从而得到端墙静态总侧压力计算公式和非线性的静态压强分布;动态值可根据本文分析的极限被动压力,加上维持动态冲击的力得到,从而得到端墙动态总侧压力计算公式和非线性的动态压强分布。并分别对两种状态下不同货物参数作比较,得到不同参数下的静、动态值变化规律。本文采用的MATLAB辅助程序,使得计算简单化。

On the basis of the classical theories of earth pressure, this paper uses the method of horizontal slices to analyze the limited passive lateral pressure of granular cargo on the end walls of the open wagon. The over-all states of granular cargo are analyzed for the moving wagon. The static lateral pressure is derived with reference to from the active earth pressure formula under Document[10]. The vibrating coefficient must be considered. Then the end-wall total static lateral pressure formula and non-linear static pressure distribution are obtained. The dynamic values are calculated from the addition of the limited passive pressure and the force which maintains the dynamic impact. Then the end-wall total dynamic lateral pressure formula and non-linear dynamic pressure distribution are obtained. Parameters of different cargo are compared under static and dynamic conditions respectively, and the changing laws of static and dynamic values are found with different cargo parameters. The matlab auxiliary program is used to simplify computation.