从技术上论述了铁路运输露天矿采用组合台阶开采时,确定工作帮坡角及其结构参数应考虑的主要因素,并从理论上探讨了彼此之间的相互关系和确定这些参数的依据、原则和方法。同时根据生产剥采比的变化规律,研究了不同服务年限的矿山在不同开采深度的工作帮坡角的变化。 From the technical point of view, the main factors that should be considered when determining the working slope angle and its structural parameters should be considered when using the combined bench mining in the open pit of railway transportation. The principle and the principle of determining these parameters are theoretically discussed And method. At the same time, according to the variation rule of production stripping ratio, the change of working slope angle of mines with different service years at different mining depths was studied.