PERFORMANCE OF THREE-DIMENSIONAL SLOPE STABILITY METHODS IN PRACTICE
PERFORMANCE OF THREE-DIMENSIONAL SLOPE STABILITY METHODS IN PRACTICE
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DOI：
10.1061/(asce)1090-0241(1998)124:11(1049
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发表时间：
1998-11
影响因子：
3.9
通讯作者：
T. Stark;H. Eid
中科院分区：
文献类型：
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作者：
T. Stark;H. Eid
对多个现场案例历史的研究表明，二维和三维安全因素之间的差异在涉及平移失败的案例中最为明显。现场案例历史的二维和三维边坡稳定性分析以及典型边坡几何形状的参数研究表明，商业上可用的三维边坡稳定性程序在以下方面存在许多局限性：（1）考虑沿滑动体侧面的剪切阻力； (2) 对所涉及材料的失效包络线的应力相关性质进行建模； (3)考虑滑动体中的内力。这些限制可能会显着影响平移失效模式的安全系数计算。提出了一种技术来克服其中一些限制并提供对三维安全系数的更好估计。现场案例历史显示了使用三维分析在反算斜坡破坏所涉及的材料的动员剪切强度以及设计具有复杂地形、剪切强度条件和/或孔隙水压力的斜坡时的重要性。
Study of several field case histories has shown that the difference between two- and three-dimensional factors of safety is most pronounced in cases that involve a translational failure. Two- and three-dimensional slope stability analyses of field case histories and a parametric study of a typical slope geometry revealed that commercially available three-dimensional slope stability programs have a number of limitations with respect to (1) accounting for the shear resistance along the sides of the sliding mass; (2) modeling the stress-dependent nature of failure envelopes of the materials involved; and (3) considering the internal forces in the slide mass. These limitations can significantly affect the calculated factor of safety for a translational failure mode. A technique is presented to overcome some of these limitations and provide a better estimation of the three-dimensional factor of safety. Field case histories are presented to show the importance of using a three-dimensional analysis in back-calculating the mobilized shear strength of the materials involved in a slope failure and in the design of slopes with complicated topography, shear strength conditions, and/or pore-water pressures.