极限平衡法与有限元强度折减法在露天矿边坡稳定性分析中的应用对比

摘要

The basic theory of limit equilibrium method and finite element shear strength reduction method are illustrated.The stability of the west slope of a open-pit mine are analyzed by using the Slide 6.0 and Phase2 8.0 software,the safety factor calculated by limit equilibrium method and finite element shear strength reduction method are conducted comparison analysis.The result show that the safety factors calculated by the above two methods are very close with each other,the safety factor calculated by limit e-quilibrium method is 1 .0,the one calculated by finite element shear strength reduction method is 1 .04~1.06,they are both low than lowest safety factor (1.25),which indicated that the ground support is re-quired.According to the above analysis results,the cable bolts are applied to reinfore the sliding face.The safety factor of the reinforced slope is 1 .25 ~1 .32,which meets the stability safety factor for the west slope of the open-pit mine.The study results of the paper show that the safety factors calculated by limit e-quilibrium method and finite element shear strength reduction method are in compliance with the actual engineering situation,thus,they are both can be used for the stability analysis of the other slopes in open-pit miens.%阐述了极限平衡法和有限元强度折减法两种边坡稳定性分析方法的基本原理，采用Slide 6．0和Phase28．0两款软件对某露天矿西部边坡的稳定性进行分析，对比极限平衡法与有限元法计算出的安全系数。计算结果显示，两款软件计算出的安全系数接近，有限元法为1．0，极限平衡法为1．04～1．06，安全系数均达不到该边坡所要求的最低安全系数1．25，必须对边坡加固。根据软件数值分析出的滑移面用长锚索进行加固，加固后边坡安全系数为1．25～1．41，达到西部边坡的安全要求。经过对边坡稳定性的分析发现，极限平衡法和有限元法计算的安全系数均符合实际工程情况，适用于相似边坡的稳定性分析。