【作者】 张青青；

【导师】 欧阳治华；

【作者基本信息】 武汉科技大学 ， 岩土工程， 2011， 硕士

【摘要】 矿石的回采会引起矿山采空区周围岩体应力的重新分布,当这种重新分布的应力超过岩体的强度极限时,将会造成岩体失稳破坏,因此,采空区岩体受力状态研究及稳定性评价就显得尤为重要。本文结合大冶灵宝铁矿,以采空区岩体稳定性评价为主线,以为该矿山残矿回采决策提供依据为目的,采用定性评价和定量评价相结合的方法,对采空区岩体的稳定性展开了系统的研究。通过资料查询与现场调查,找出影响岩体稳定性的矿山工程地质与水文地质因素。结合在实验室内对-88m采空区采集的岩石进行点载荷强度指标试验结果,对该采区岩体进行RMR与Q系统岩体分类,得出灵宝铁矿采空区岩体属于较好质量岩体。运用ANSYS软件对灵宝铁矿进行三维建模分析,得出矿山采空区岩体应力及安全系数分布情况在残矿回采前后的变化规律,评价残矿的回采对采空区岩体稳定性的影响。通过对井下采空区状况调查,建议该矿采用封闭法来处理井下采空区,包括小包山矿-70m水平以上采空区和-88m水平以下采空区。最后,在有限元分析得出的-88m水平采空区岩体应力集中分布的区域,合理布设声发射监测点,对残矿回采主要作业采空区岩体地压活动进行监测,分析监测数据,预测预报采空区岩体稳定性变化趋势,对矿山残矿的安全回采有一定的指导意义。更多还原

【Abstract】 In the course of mining, the stress in arounding rock mass will redistribute, when this kind of stress exceeds surrounding rock’s ultimate strength, surrounding rock will lose its stability and destruct. Consequently, it becomes increasingly important for the study of the forced condition of rock mass and its stability during mining.Associated with Daye Lingbao iron mine in this paper, sticking to the evaluation of rock’s stability, aiming to providing bases for mining residual ore in this mine, with the combination of qualitative evaluation, quantitative evaluation, the rock’s stability of goaf is studied systematically. Finding out the engineering geological and hydrogeololgy factors influencing rock’s stability of goaf by resourcing and field survey. Classifying the rock mass using RMR method and Q system method, according to the results of point load index test for rock selecting in the depth -88m, and the specific geological conditions of Lingbao iron mine. The quality of rock mass in this mine is good. Building 3D model of Lingbao iron mine by ANSYS, evaluating the effect on the stability of the rock mass during residual ore mining, through analyzing the distributing law of stress and safety factor in rock mass before and after residual ore mining. Through to the condition investigation of underground goaf, the suggestion on the method of dealing with goaf is closed, including goafs above -70m level and below -88m level in Xiaobaoshan mine. Finally, arranging acoustic emission monitoring points reasonably in the stress concentration area of goaf, monitoring pressure activities of rock mass in the main goaf, analyzing the data, predicting the change trend of rock’s stability, and providing directive significance for the safety of mining residual ore.更多还原