A new double reduction method for slope stability analysis
A new double reduction method for slope stability analysis
复制标题
边坡稳定性分析的双折减新方法
DOI：
10.1007/s11771-014-2049-6
复制
发表时间：
2014-03-01
影响因子：
4.4
通讯作者：
Li Xiao-chun
中科院分区：
文献类型：
--
作者：
Bai Bing;Yuan Wei;Li Xiao-chun
强度折减法（SRM）的核心是找到一条使边坡发生整体破坏的临界强度曲线和一个安全系数（FOS）的定义。基于对SRM的理解，提出了边坡稳定性分析的二次折减方法，包括详细的计算步骤和FOS的定义。在构造新的FOS定义时，力求使其物理意义简洁，并能充分反映边坡的抗剪强度。通过两个算例，分别以63°和34°的斜坡A和B为例，验证了本文方法的正确性。结果表明，对于这两种边坡，原强度折减法的自由临界值分别比二次折减法高1.5%和38%。研究还发现，双重归算方法预测的潜在滑动线更深，滑动体更大。结果表明，二次强度折减法与传统强度折减法相比是合理的，但原有强度折减法可能高估了边坡的安全性。建议在实际的边坡稳定性评价中考虑将所提出的方法作为一种附加的选择，尽管需要更多有用的经验。
The core of strength reduction method (SRM) involves finding a critical strength curve that happens to make the slope globally fail and a definition of factor of safety (FOS). A new double reduction method, including a detailed calculation procedure and a definition of FOS for slope stability was developed based on the understanding of SRM. When constructing the new definition of FOS, efforts were made to make sure that it has concise physical meanings and fully reflects the shear strength of the slope. Two examples, slopes A and B with the slope angles of 63° and 34° respectively, were given to verify the method presented. It is found that, for these two slopes, the FOSs from original strength reduction method are respectively 1.5% and 38% higher than those from double reduction method. It is also found that the double reduction method predicts a deeper potential slide line and a larger slide mass. These results show that on one hand, the double reduction method is comparative to the traditional methods and is reasonable, and on the other hand, the original strength reduction method may overestimate the safety of a slope. The method presented is advised to be considered as an additional option in the practical slope stability evaluations although more useful experience is required.