露天转地下开采对环境影响的研究

发布时间：2018-03-27 14:53

  本文选题：数值模拟　切入点：露天转地下　出处：《北方工业大学》2015年硕士论文

【摘要】：众所周知,任何矿山岩体工程开挖系统都不是一次完成的,而是多步骤累次完成的,对井工与露天联合开采条件下的矿山更是如此。在矿山开采过程中,其地质工程环境、结构、载荷、应力场分布时刻都在变化之中,即为动态变化系统；本文以北京云冶矿业有限责任公司的开采实践为基础,依据两种开采的空间对应关系、两种采动影响域相互重叠或包含的特点对联合开采的“空间属性”进行研究,并取得了如下成果： (1)在露天转地下开采形成的采动影响作用下,露天边坡恰好位于地下采动影响域内,致使两种采动影响域中的一部分相互重叠,由此造成了两种采动效应相互作用、相互叠加和相互影响,从而构成复合叠加效应,使得边坡岩体的变形与破坏模式完全不同于单一露天采动效应下岩体变形问题。针对此情况,系统对在露天转地下过程中不同开挖量对上覆岩体及周围环境影响进行了模拟,揭示了露天转地下开采中地表沉陷的移动规律及并确定了上覆岩体环境影响范围。 (2)通过数值模拟分析了Ⅶ-Ⅶ剖面应力应变的动态变化,确定了露天转地下开采不同开采量对上覆岩体影响的移动规律。 (3)应用临界滑移场法和极限平衡法对自然边坡与复合边坡的稳定性进行了预测分析,并确定对应边坡的稳定系数。 (4)针对密云矿区的地质条件及相应的周围环境,对Ⅶ-Ⅶ剖面露天转地下开采Ⅶ-Ⅶ剖面及整个上峪矿区的地表危险区域进行界定；并对在上峪采场露天转地下开采过程中,其深部矿体开采将诱发自然山体的滑坡,需要采取相应的防控措施达到矿山安全生产的目的。
[Abstract]:As we all know, the excavation system of rock mass engineering in any mine is not completed in one time, but is completed time by step, especially in the mine under the condition of combined mining of well workers and open pit. In the process of mining, its geological engineering environment, The distribution of structure, load and stress field is changing at all times, that is, dynamic change system. This paper bases on the mining practice of Beijing Yunye Mining Co., Ltd., according to the spatial corresponding relationship between the two kinds of mining. The "spatial attributes" of joint mining are studied by overlapping or including characteristics of the two kinds of mining impact areas, and the following results are obtained:. (1) under the influence of open pit to underground mining, the open-pit slope is located in the underground mining impact zone, which results in the overlap of some of the two mining effects, which results in the interaction between the two mining effects. The deformation and failure mode of the slope rock mass is completely different from the rock mass deformation problem under the single open-pit mining effect because of the superposition and mutual influence of each other, so that the composite superposition effect is formed. The effects of different excavations on the overlying rock mass and its surrounding environment are simulated in the process of open-pit to underground mining. The movement law of the surface subsidence and the influence range of the overlying rock mass environment are revealed in the process of open-pit to underground mining. (2) the dynamic change of stress and strain in section 鈪，

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