Abstract: Concerning the application requirements of slope stability analysis in large areas and the defects of current calculation method, a three-dimensional analysis method based on Digital Elevation Model (DEM) data was proposed. In this method, a sphere was used, instead of ellipsoid, to search slippery surface, and the slope safety factor under the three-dimensional conditions was calculated through integral operator with the results of two-dimensional analysis. Finally, the position and shape of possible landslide were determined according to the safety factor. The practical application results confirm that this method simplifies the search algorithm, ensures the accuracy of slope stability analysis, and improves the efficiency of analysis and calculation.

Key words: Digital Elevation Model (DEM), slope, three-dimensional analysis, stability, sliding surface

摘要： 针对大范围区域内坡面稳定性分析的应用需求和目前边坡稳定性计算方法的缺陷，提出了一种基于数字高程模型（DEM）数据的三维分析方法。该方法采用球面代替椭球面进行滑面的搜索，并通过对二维分析结果的积分运算来计算三维条件下的边坡安全系数，最后根据安全系数确定可能的滑坡位置和形状。实际的应用结果表明，该方法简化了滑体搜索算法，能够保证边坡稳定性分析的精度，并提高了分析计算的效率。

关键词: 数字高程模型, 坡面, 三维分析, 稳定性, 滑面