论金属矿山排土场设计规范中边坡极限平衡计算方法的选取

 排土场新规范编制过程中，稳定性计算方法的选用出现争议，为此，文中分析7种极限平衡方法在排土场边坡稳定性计算中安全系数的差值百分比与标准差，并通过这2个指标评价各方法的计算精度与适用性；结合前人的研究成果，阐述这些方法在排土场边坡应用中应注意的问题。7种计算方法都无法在所有工况中均保持小于5%的精度，因此，不建议指定某一种方法作为唯一验证方法，可选取4种精度最高的方法均值作为验算依据；瑞典圆弧法精度一般较差，特别是考虑地下水问题时，会出现超过30%的误差，并且标准差较大，计算结果可以作为下限值参考；毕肖普法虽然只满足力矩平衡条件，但是计算精度为3.7%，且标准差较小，算法简单，推荐优先选用；满足力与力矩平衡条件的方法，其计算结果与所有方法均值的差值均较小，且标准差较小，适用于各种分析工况。

SELECTION OF LIMIT EQUILIBRIUM METHODS IN THE DESIGN SPECIFITION FOR WASTE DUMP OF METAL MINE

There are some controversies on the selection of stability calculation methods when preparing for the new specification of waste dump. We evaluate the accuracy and applicability of 7 limit equilibrium methods by using the difference percentage and standard deviation of safety factors in waste dump slope stability analysis. Combined with previous research，the application of limit equilibrium method in waste dump slope analysis is described. Ordinary method has a poor accuracy. The accuracy is larger than 30% and the standard deviation is large when dealing with ground water problem. Its calculation result can be used as a lower limit. Bishop method has an accuracy of 3.7% and good standard deviation，although only satisfying moment equilibrium. For the simple algorithm，it is recommended as a basic method. The correct values can be obtained from methods satisfying force and moment equilibrium，which applies to a variety of conditions.