司家营研山铁矿采场三维边坡稳定性数值模拟及协同监测分析

Numerical Simulation and Collaborative Monitoring Analysis of Three-dimensional Slope Stability in Sijiaying Yanshan Iron Mine

司家营研山铁矿是典型的沉积变质型铁矿,矿体赋存于单斜构造中,东帮顺倾,西帮反倾,近年发生了多处不同规模的滑坡,边坡稳定性问题严重。 根据地质剖面资料,结合矿山采剥计划和最终境界设计方案,建立矿山三维地质模型,并划分有限元网格。 利用 FLAC^(3D)对现状边坡建立静力学平衡后进行两步开挖数值模拟,分步开挖至2022 年排除境界和最终境界,并利用现场协同监测设备对模拟结果进行验证。 结果表明:(1)潜在的塑性破坏区主要分布在东帮 N26 勘探线附近及西帮 N14 勘探线附近,与滑坡现状较为吻合;(2)随着开采深度增加,东西帮的塑性破坏区范围均有进一步扩大趋势,其中东帮顺层边坡侧分布范围及深度远大于西帮反倾边坡;(3)开挖后边坡具有向临空面方向的变形趋势,东帮的位移值和变形区域均大于西帮,层状岩层导致整体变形具有各向异性特征;(4)协同监测系统对模拟结果进行了验证,并得到了研山东帮浅部应力及损伤大于深部。 因此,司家营研山铁矿东、西帮(尤其东帮)边坡均有潜在滑坡风险,应对其潜在塑性区采取适当加固防治措施。

Sijiaying slope Yanshan slope Iron Mine is a typical sedimentary metamorphic iron mine. The occurred eastern recent slope years,so is the bedding slope and the problem western is is anti-inclined slope. Landslides geological of data established different and scales mining the have in stalimit,used bility a serious. According to model the of profile the and production elements schedule are and meshing. The2022the ultimate FLAC^(3D)pit is three-dimensional simulate geological two-step the mine slope. The simulation is finite out to pit results and the the excavation pit of the the plastic excavation results is carried verified step field near by step from year monitoring production schedule limit show N14to ultimate that:(1)limit. And potential are mainly good by the collaborative the equipment. The of The failure slope,which range areas are depth are in of distributed agreement N26current exploration status line eastern slope the the exploration mining line of western distribution with slope the the of much landslides;(2)larger With those increase anti-inclined of depth,the west;(3)and the bedding tendency in deformation western east towards slope. (4)are than face,and of the in the After of excavation,the eastern slope are has larger a than found of the stress slopes the The free the results displacement were and the decolwere Sijiaying formation laborative greater area the monitoring slope that that of the simulation shallow verified Mountain east by system,and the it was and the damage east in west the part of Yanshan slope of than those Iron in Mine deep part. Therefore,the potential of and banks measures(especially should the taken bank)its Yanshan zone.have landslide risks,so appropriate reinforcement be for potential plastic zone.