Acta Metallurgica Sinica
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FANG Hongwei,WU Jianxun,HOU Zhenkun
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Abstract: The strength reduction method (SRM) has an advantage over other methods in evaluating slope stability for automatically determining a critical slip surface. However, a key problem is that there is no corresponding definite standard for an instability criterion in using SRM. Previous research has shown that slope stability can be determined based on the relative position between the limit-state slope curve (referred to as the limiting slope curve) obtained from slip-line field theory calculations and the slope. Based on this conclusion, a set of new SRM-based instability criteria is proposed. The limit slope curve calculated by the slip-line field theory will change for different strength factors are calculated by different reduction factors. It can be concluded that the slope is in a stable state when the limiting slope curve does not intersect the slope at the toe. The slope is in a limit-equilibrium state when they intersect at the toe of the slope while the slope is in an unstable state when the limiting slope curve and the slope intersect. The calculation results of standard slope test show that when the new instability criterion has an advantage in convergence, safety factor calculated by the new criterion is close to the existing criterion and the standard answer. For the traditional criterion, there are no guidelines as to the choice of a tolerance criterion and the optimal number of iterations, and it is not always easy to find the sharp break point immediately after a slope failure, especially when the displacement curve is relatively smooth. Also, it is difficult to define a precise safety factor from this criterion, moreover, the evaluation criterion with a presumed allowable iteration number is influenced by an artificial factor. The objective quantification of the instability criterion can be realized by the new instability criterion. The critical slip surface shape and position determined by the plastic strain in the slope are basically the same as the standard answer. The new instability criterion is applicable for the strength reduction method.
Key words: slope stability, strength reduction method, slip line-field theory, instability criterion
FANG Hongwei,WU Jianxun,HOU Zhenkun. A New Criterion of Strength Reduction Method for Slope Instability Based on the Slip Line-Field Theory[J]. Acta Metallurgica Sinica.
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URL: https://geology.nju.edu.cn/EN/
https://geology.nju.edu.cn/EN/Y2019/V25/I5/766