基于PFC2D马鞍山铁矿2号露天采场边坡稳定性分析

Stability analysis of slope stability of No.2 open pit in Maanshan Iron Mine based on PFC2D

基于颗粒流离散元理论,利用fish语言编写强度折减系数的函数对边坡稳定性进行研究。通过研究宏微观参数之间的关系,参照传统的强度折减法,对颗粒的平行连接强度和摩擦因数进行折减。在有明显位移时,以累计位移作为边坡失稳的判断标准;无明显位移时,以不平衡力与接触力之间的比率作为计算结束标准。结合马鞍山铁矿2号露天采场具体情况,分别采用PFC2D软件和bishop法计算了其安全系数,其结果分别是3.874和5.564,并对2种方法产生差异的原因进行了分析,可为PFC2D中实现强度折减法的改进提供参考。

Based on the theory of particle flow code ,the paper wrote a program of strength reduction factors to an-alyze the stability of the slope with fish language .It studied the relationship between macro-parameters and micro-pa-rameters .Then referring to traditional strength reduction ,it decided to reduce parallel-bond strength and friction coeffi-cient.When the displacement was obvious ,the cumulative displacement would be the failure criterion of the slope .If the displacement was not obvious ,the specific ratio of average unbalanced mechanical force would be the failure crite-rion.Combining with No .2 open pit in Maanshan Iron Mine , it calculated the safety factors with PFC 2 D and Bishop method.And the safety factors were 3.874 and 5.564.At last,it analyzed the causes of the inconsistence and provided some research directions of improving strength reduction method in PFC 2D.