边坡稳定不平衡推力法的精度分析及其使用条件
Accuracy and application range of Imbalance Thrust Force Method for slope stability analysis
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摘要: 不平衡推力法是我国独创的边坡稳定性分析方法 ,在滑坡的分析治理中得到了广泛应用 ,然而对其精度的分析却寥寥无几。目前在与其它方法的对比分析中 ,发现在某些情况下其误差非常大 ,如果不加限制地使用该方法 ,可能会给工程带来巨大的隐患。针对该方法存在的问题 ,通过理论分析和算例比较 ,认为折线形滑面的计算精度与滑面控制点处滑面倾角的变化密切相关 ,通过控制该变化角度可以控制其精度 ,工程中建议将滑面控制点处的倾角变化小于 10°作为该方法的使用条件 ,超过该限制应对滑面进行处理使它满足使用条件或采取其它的分析方法。Abstract: Imbalance Thrust Force Method (ITFM) is an original method for slope stability analysis in China, which has been widely used in the field of slope stability analysis and slope stabilization.But the accuracy of results obtained from ITFM is rarely to be interested and analyzed.It has been proved that the error from ITFM is high enough and can not be neglected, so there is some hidden trouble in practice if ITFM is misused. Through theoretical analysis and comparison of examples,it is considered that the accuracy of ITFM is influenced by the variation of obliquity of sliding surface,and it can be improved by adjusting the variation of obliquity.The variation of obliquity must be less or equal to 10 degrees when ITFM is used, otherwise other slope stability analysis methods must be selected.
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