剥落型矿柱与早强胶结充填体相互作用损伤演化分析

发布时间：2019-03-12 10:13

【摘要】：为了研究矿柱底部严重剥落形成的上宽下窄型矿柱与早强胶结充填体的相互作用,进行了现场地质调查,选用石蜡模拟早强胶结充填体进行室内试验,同时进行数值模型的构建和试验模拟研究。试验结果表明:在加载过程中,破坏主要发生在矿岩中,石蜡充填体由于具有较强的变形能力,没有明显的破坏裂纹;矿岩中的裂纹主要沿矿岩和充填体接触面进行延展,直至延伸至临空面破坏;试样表壁的石蜡薄层表征显示在加载过程中,在试样表壁大的裂纹带附近伴随小裂纹产生。通过相关研究,厘清剥落型矿柱与早强充填体的相互作用机理及破坏规律,以便开展针对性的矿柱补强,确保充填采场安全稳定。
[Abstract]:In order to study the interaction between the upper width and lower narrow type pillar formed by the severe spalling of the bottom of the pillar and the early strength cementation filling, the geological investigation was carried out on the spot, and the paraffin wax simulated early strength cement filling was selected to carry out the laboratory test. At the same time, the construction of numerical model and experimental simulation are carried out. The experimental results show that the failure occurs mainly in the ore rock during the loading process, and there is no obvious failure crack in the paraffin filled body due to its strong deformation ability. The cracks in the ore-rock mainly extend along the contact surface of the ore-rock and the filling body until it reaches the failure of the near-empty surface, and the paraffin-wax thin layer characterization of the surface wall of the specimen shows that during the loading process, small cracks occur near the large crack zone on the surface of the sample wall. Through relevant research, the interaction mechanism and failure rule between peeling pillar and early strength filling body are clarified, so as to carry out targeted pillar reinforcement and ensure the safety and stability of filling stope.
【作者单位】：武汉科技大学资源与环境工程学院;武汉科技大学冶金矿产资源高效利用与造块湖北省重点实验室;
【基金】：国家自然科学基金项目(51604195)
【分类号】：TD801

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