研究目的:岩土质边坡是我国中西部山区常见的一种边坡类型。大量工程实践表明,若岩土质边坡下部存在顺坡向的土石界面或岩层面,且上部覆盖一定厚度的黏性土,岩土质边坡在开挖过程中极易诱发滑坡、坍塌等次生灾害,其实际的滑动面多呈现出圆弧直线型。而目前的边坡稳定性分析方法一般假定滑动面为圆弧型或折线型,不能够较好地满足此类型岩土质边坡稳定性分析的要求。为此,本文探究一种基于圆弧直线型滑面搜索的岩土质边坡稳定性分析方法。
研究结论:（1)论文采用了一种基于平面坐标系统的组合滑动面搜索模式,该方法考虑了岩土质路堑边坡的几何特征和典型滑移模式,通过不断改变黏性土土层内圆弧滑动的虚拟搜索圆心坐标位置,能够寻找圆弧直线组合滑动面的有效交点，可实现对不同位置潜在的圆弧直线组合滑动面上滑体的稳定性分析过程； (2)论文采用C#作为开发工具，基于该计算分析方法编制了岩土质路堑边坡稳定性分析的相关软件，可自动实现圆弧直线组合滑动面全剖面搜索和最小稳定安全系数的分析过程;（3)该研究成果已较好地应用于吕临铁路支线工程滑坡优化设计工作中,有效提高了路堑边坡设计精度及效率,对解决圆弧直线型滑动边坡的稳定性分析具有较强的借鉴作用。
Research purposes ： The rock - soil mixture slope is a common type of a slope in the Midwest China mountain area. A large number of engineering practices show that some rock - soil mixture slopes after the excavation frequently appear to secondary disasters in especial their bottom on the rock - soil interface and the upper covered a certain thickness of clayey soil，such as landslide and collapse. In addition，the actual combined sliding surface is made up of arc and straight line，however，current stability analysis mode of the rock - soil mixture slope which cant be able to better meet the requirements of this type slope is based on the simplex assumption of circular arc or fold line shape. For this purpose，the paper puts forward a method which is based on circular and linear sliding surface for stability analysis about rock - soil mixture slopes.
Research conclusions :(1) A search pattern which is based on the hypothesis of combination sliding is adopted in plane coordinate system. The method is considered the geometric characteristics and typical sliding mode of rock - soil mixture slope through continuous change of sliding positions of circle center and calculation effective intersection of arc and line. (2) A calculation and analysis software about rock - soil mixture slope stability is developed by means of C# program for automatic searching combined sliding surfaces and calculating the minimum safety factor in slope section. (3) The research results were ideally applied for landslide improvement design in Lvliang - Linxian railway branch line engineering to improve the design precision and efficiency for many rock - soil mixture slopes，and this method is a good reference for the stability analysis to slope sliding along arc and straight planes.
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