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为研究红岭铅锌矿大规模回采过程中围岩顶板的破坏模式及区域,分析承压矿柱以及围岩的应力演化规律,明确空区群的力学状态以及稳定性。建立大尺度复杂空区群三维力学计算模型,应用大规模并行计算技术,对中段回采中围岩矿柱破坏模式及应力演化规律进行了研究。结果表明:顶板在不同矿体厚度区域,会产生“<”型剪切破坏、发散型破坏、X状共轭剪切破坏以及单斜面剪切破坏等不同破坏形式;回采后产生9个主要承压矿柱、4个次要承压矿柱;中段回采,会对上一中段产生明显应力扰动,原有破坏扩展,并产生新的破坏,但隔段回采,不会对最上中段产生应力影响。
In order to study the failure modes and areas of the surrounding rock roof during the large-scale recovery process of Hongling lead-zinc mine, the stress evolution laws of the confined pillars and the surrounding rock are analyzed, and the mechanical state and stability of the open-space group are clarified. The calculation model of large-scale complex empty zone group is established. The large-scale parallel calculation technique is used to study the failure mode and stress evolution law of the surrounding rock pillar in the middle section. The results show that the top plate has different failure modes such as shear failure, divergent failure, X-shaped conjugate shear failure and monoclinic shear failure in different ore body thickness regions. After the mining, 9 The main bearing pressure pillar, four secondary pressure bearing pillar; the middle section of the mining, will have a significant stress on the previous paragraph perturbation, the original destruction of the expansion, and produce new damage, but the interval recovery, will not produce the middle of the most Stress effects.