研究目的:在滑坡稳定性计算中，滑面位置的选择对计算结果有着重要的影响，而黄土滑坡因受含水率 影响较大，常常存在多重滑面，本文研究目的就是确定最不利滑面的位置。
研究方法:以宝中线某高路堤黄土滑坡为例，探讨了综合考虑液性指数、塑性指数、含水率、新老土层接合 面和坡面开裂及鼓出控制点等多种因素综合确定滑动面的方法。根据地质钻探获得的数据，通过不同的组合 方式形成一系列的折线滑面，依据坡面开裂及鼓出控制点确定各组圆弧滑面，从单因素分析到多因素综合，从 而找出最不利滑面。
研究结论:根据最不利滑面计算的滑坡推力及据此做出的抗滑桩设计应用于工程实践的结果，表明了该 方法的可行性，它适用于已有一定微量蠕动和变形，而又尚未发生明显整体位移，且又无法通过复杂表象确定 滑动面位置的均质土体滑坡。
Research purposes ： In calculation of the landslide stability , the determination of slide face location makes big effects on the calculation result. Multiple slide face often exists in loess slide face because of large water content in loess slide face. The research purposes of this paper are to determine the location of the most unfavourable slide face.
Research methods: Based on one loess landslide of a high embankment of Baoji-Zhongwei Railway, the exploration is made on the method of determining the location of slide face through comprehensive consideration of the liquidity index, elastic index, water content, joining face between fresh and old soils, slope crack and bulging control spots. Based on the data of survey, the most unfavourable slide face can be found out through forming a series of fold lines with the different formulas, determining arc slide faces of every group with the slope crack and bulging control spots and making analyses of single element and multiple elements.
Research Conclusions：The construction practice of adopting anti-sliding pile based on the calculated pushing force of the most unfavorable slide face shows this analysis method is feasible for the homogenized soil body which had a small wriggle and deformation without obvious overall displacement and was difficult to determine the position of sliding face with the complicated surface phenomenon.
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