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为有效预防和减少地下采场失稳事故,在采场稳定性分析中,将围岩质量特性与开采实际相结合,利用基于距离判别的岩体质量模糊评价法,建立岩体质量分级模糊综合评价模型。将该模型用于三山岛新立矿区地下采场岩体质量分级,用Surpac软件显示岩体质量分级结果。针对岩体质量不稳定区域,运用Hoek-Brown准则和工程岩体分级标准对不同质量等级矿岩的物理力学参数进行折减,结合采场开采方案,采用有限元模拟软件建立不稳定区域采场数值模拟计算模型,分析不稳定区域开采引起的位移及应力变化。结果表明:该矿区不稳定区域采场可能发生顶板冒落失稳和上覆岩层整体下沉失稳。针对这2种失稳形式采取锚杆支护与位移监测措施,以确保矿山安全、稳定开采。
In order to effectively prevent and reduce the instability of underground stope, in the stability analysis of stope, the quality characteristics of surrounding rock are combined with the actual mining, and the fuzzy evaluation of rock mass quality based on distance discrimination is used to establish the fuzzy comprehensive evaluation of rock mass quality Evaluation model. The model was applied to the grading of rock masses in the underground stope of Xinli mining area in Sanshan Island, and the grading results of rock mass quality were shown by Surpac software. According to the Hoek-Brown criterion and engineering rock mass grading standards, the physical and mechanical parameters of ore rock with different quality grades are reduced according to the rock mass unstable area. Combined with the stope mining scheme, the finite element simulation software is used to establish the unstable stope Numerical simulation model is used to analyze displacement and stress changes caused by mining in unstable area. The results show that the roof caving instability and the overall subsidence instability of the overlying strata may occur in the stope in the unstable area of the mine. Aiming at the two kinds of instability forms, the measures of bolt support and displacement monitoring are taken to ensure the mine safety and stable mining.