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结合石人沟铁矿-60 m水平的具体地质条件、采矿技术条件、岩体力学性质,采用相似材料模拟实验和现场监测数据结合印证的方法,对浅孔留矿法开采岩体应力扰动、位移及破坏规律进行研究。得出如下结论:留矿法开采过程中,矿柱经历了应力释放继而逐步承受上部压力最终达到平衡的受力过程;应力集中和变形主要集中在矿柱的下部,在回采靠近底板分层时变化最明显,随着回采高度的增加,矿柱和顶板的变形量逐渐增大,表明在施工过程中,应该加强对穿脉巷道的支护和监测,以维护巷道及间柱的稳定。通过对两种矿柱回采方案的比较,建议应采用上向水平分层法进行矿柱的回收。
Combined with the specific geological conditions of -60 m at Shirengou iron mine, mining technical conditions and mechanical properties of rock mass, the stress disturbance of rock mass mining by shallow-hole retention mining method is simulated by simulating experiments with similar materials and on-site monitoring data. Displacement and destruction of the law to conduct research. The conclusion is drawn as follows: during the mining method, the pillars have undergone stress release and then gradually withstand the stress caused by the upper pressure finally reaching the balance. Stress concentration and deformation are mainly concentrated in the lower part of the pillars. The most obvious change is that with the increase of mining height, the deformation of pillar and roof gradually increases, indicating that during the construction process, the support and monitoring of crossing weeping should be strengthened in order to maintain the stability of roadway and between columns. Through the comparison of the two pillars recovery program, it is suggested that the pillars should be recovered by the horizontal leveling method.