冯雪磊, 马凤山, 赵海军, 刘港, 刘国伟, 郭捷. 2017: 龙首矿六角形胶结充填的岩体塑性屈服和稳定性分析. 工程地质学报, 25(s1): 253-260. DOI: 10.13544/j.cnki.jeg.2017.s1.041
    引用本文: 冯雪磊, 马凤山, 赵海军, 刘港, 刘国伟, 郭捷. 2017: 龙首矿六角形胶结充填的岩体塑性屈服和稳定性分析. 工程地质学报, 25(s1): 253-260. DOI: 10.13544/j.cnki.jeg.2017.s1.041
    FENG Xuelei, MA Fengshan, ZHAO Haijun, LIU Gang, LIU Guowei, GUO Jie. 2017: ROCK MASS PLASTIC YIELD AND STABILITY ANALYSIS OF HEXAGONAL CENMENTED BACKFILL OF LONGSHOU MINE. JOURNAL OF ENGINEERING GEOLOGY, 25(s1): 253-260. DOI: 10.13544/j.cnki.jeg.2017.s1.041
    Citation: FENG Xuelei, MA Fengshan, ZHAO Haijun, LIU Gang, LIU Guowei, GUO Jie. 2017: ROCK MASS PLASTIC YIELD AND STABILITY ANALYSIS OF HEXAGONAL CENMENTED BACKFILL OF LONGSHOU MINE. JOURNAL OF ENGINEERING GEOLOGY, 25(s1): 253-260. DOI: 10.13544/j.cnki.jeg.2017.s1.041

    龙首矿六角形胶结充填的岩体塑性屈服和稳定性分析

    ROCK MASS PLASTIC YIELD AND STABILITY ANALYSIS OF HEXAGONAL CENMENTED BACKFILL OF LONGSHOU MINE

    • 摘要: 金川镍矿是我国重要的镍矿资源基地,矿区内岩体破碎、矿岩品位较高,龙首矿采用六角形进路分层向下胶结充填采矿方法,西二采区上部矿体和充填体的塌陷对于下部中段采矿活动影响很大。本文对六角形分层向下充填造成矿体和充填体的变形破坏机理进行分析,建立数值计算模型分析浅部和深部环境下岩体早分层胶结充填过程中塑性屈服区域和应力场的变化。浅部矿体在自重应力作用下,随着分层开采的向下进行,模型中塑性屈服区域逐渐增大。深部矿体受构造应力与自重应力作用,开挖初期产生的塑性屈服区域较大,充填体上部围岩也出现塑性屈服,随着开挖充填向下进行,垂直和水平构造应力使得应力场重新分布,上部塑性屈服消失,模型屈服区域减小。浅部矿体向下分层充填开挖,自重应力下,拉应力区域主要集中于六角形断面周围尤其是顶板围岩附近。深部水平和垂直构造应力改变了采场内应力状态,六角形断面周围拉应力区域减小且分布更加均匀,有利于六角形断面采场稳定。但整个模型区域内压应力升高,远离六角形断面处易出现塑性屈服,长时间开挖充填会对岩体稳定性产生不利影响。

       

      Abstract: Jinchuan nickel mine is Chinese most important nickel mineral resource base, which was characterized developed faults, structure plane and mine high grader. Longshou mine uses hexagonal approach cut and fill method. The collapse of the upper ore body and the filling body in the west mining area of Longshou Mine has a great influence on the below mining activities. This paper aims to analyze the mechanism of deformation and failure of mine body and filling. The numerical calculation model was used to analyze the changes of plastic yield zone and stress field during the process of filling and cementation. In the shallow area of mine body, the plastic yield area gradually increases with the progress of the stratified mining under the action of self-stress. Under the action of tectonic stress and self-stress, the plastic yield area of the deep mine body is larger than that of the deep ore body. With the excavation and filling, the vertical and horizontal structural stresses made the stress field redistributed, which was more favorable for the stability of rock mass. The upper plastic yield disappeared and the model entire yield area decreased. The tensile stress was mainly concentrated in the vicinity of the hexagonal section, especially the roof of rock. The horizontal and vertical tectonic stress changed the stress state of mine stope, and the tensile stress area around the hexagonal cross section decreased and the distribution was more uniform, which was favorable for the stability of the hexagonal section. But the compressive stress increased in the whole model area, and the plastic yield was easy to be far away from the hexagonal cross section. The long time cut and fill process will adversely affect the stability of the filling body and mine rock.

       

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