基于PFC2D马鞍山铁矿2号露天采场边坡稳定性分析
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摘要
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 analyze the stability of the slope with fish language. It studied the relationship between macro-parameters and micro-parameters. Then referring to traditional strength reduction,it decided to reduce parallel-bond strength and friction coefficient. 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 criterion. Combining with No. 2 open pit in Maanshan Iron Mine,it calculated the safety factors with PFC2 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 PFC2 D.
Based on the theory of particle flow code,the paper wrote a program of strength reduction factors to analyze the stability of the slope with fish language. It studied the relationship between macro-parameters and micro-parameters. Then referring to traditional strength reduction,it decided to reduce parallel-bond strength and friction coefficient. 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 criterion. Combining with No. 2 open pit in Maanshan Iron Mine,it calculated the safety factors with PFC2 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 PFC2 D.
引文
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[5]陈宜楷.基于颗粒流离散元的尾矿库坝体稳定性分析[D].长沙:中南大学,2012.
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[7]陈欣,付建军,赵海斌,等.有限差分强度折减法中融合蒙特卡洛思想的边坡可靠性分析[J].长江科学院院报,2011,28(4):36-40.
[8]王培涛,杨天鸿,朱立凯,等.基于PFC2D岩质边坡稳定性分析的强度折减法[J].东北大学学报:自然科学版,2013,34(1):127-130.
[2]柳林超,梁波,刁吉.基于ANASYA的有限元强度折减法求边坡安全系数[J].重庆交通大学学报:自然科学版,2009,28(5):899-901,910.
[3]刘强,胡斌,蒋海飞,等.基于强度折减法的露采边坡稳定性分析[J].金属矿山,2013(5):49-52.
[4]孙书伟,林杭,任连伟.FLAC3D在岩土工程中的应用[M].北京:中国水利水电出版社,2011:221.
[5]陈宜楷.基于颗粒流离散元的尾矿库坝体稳定性分析[D].长沙:中南大学,2012.
[6]周健,池勇.土的工程力学性质的颗粒流模拟[J].固体力学学报,2004,25(4):377-382.
[7]陈欣,付建军,赵海斌,等.有限差分强度折减法中融合蒙特卡洛思想的边坡可靠性分析[J].长江科学院院报,2011,28(4):36-40.
[8]王培涛,杨天鸿,朱立凯,等.基于PFC2D岩质边坡稳定性分析的强度折减法[J].东北大学学报:自然科学版,2013,34(1):127-130.
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