诱导冒落采矿法放矿与岩体冒落的耦合作用分析

Induced caving method takes both advantages of sublevel caving method with high efficiency and that of the natural caving method with lowcost operation, which has been adopted by more and more metal mines. Around range control of rock caving, which is the key point of induced caving, research about coupling of ore drawing and rock caving will be carried out in this project. Firstly, to establish a visible three-dimensional model for joint cracks in rock masses and a test model of similar material. Then, by analysis of discrete element method (DEM), the distribution characteristics of lumpiness, density and stress field of caved granular media were gained. Based on the stochastic medium theory and combing the analysis of grain flows and ore drawing experiment, the movable probability density equation of loose bodies is solved and establish the relationship with characterization methods of drawing and upper loose-induced caving granular. In the end, based on the characterization methods and arched natural caving theory, as well as the experimental test of similar rock material, the relation model of ore-drawing quantity and caving scope will be established .This relation model can provide important theoretical and technical support for the scientific management of Induced caving, the control of caving scope and the adaptability improvement of complicated shapes of orebody.

诱导冒落采矿法实现了无底柱分段崩落法的生产工艺与矿岩自然冒落特性的有机结合，被越来越多的金属矿山所采用。围绕岩体冒落范围控制这一诱导冒落采矿法的核心问题，开展底部进路放矿与岩体冒落的耦合作用研究。首先，通过对现场岩体数据的统计分析，建立可视化的岩体节理裂隙三维分布模型和相似材料试验模型。其次，借助于非连续介质离散元分析，获得冒落散体的块度、密度及应力场分布特征。基于随机介质放矿理论，结合颗粒流分析和放矿试验，求出冒落散体移动概率密度方程，并建立底部进路放矿和上部冒落散体松散的关系以及表征方法。最后，基于该表征方法以及拱形冒落原理，并通过放矿和岩体冒落相似材料耦合实验的验证，建立底部进路放矿和冒落范围的关系模型。该关系模型可为诱导冒落采矿法放矿的科学管理、冒落范围的有效控制，以及诱导冒落采矿法对复杂矿体形态适应能力的增强，提供重要的理论和技术支撑。

诱导冒落采矿法实现了无底柱分段崩落法的生产工艺与矿岩自然冒落特性的有机结合，被越来越多的金属矿山所采用。围绕岩体冒落范围控制这一诱导冒落采矿法的核心问题，开展了底部进路放矿与岩体冒落范围关系的理论研究。首先，通过对现场岩体数据的统计分析，建立了相似材料试验模型，并进行了岩体冒落的相似材料实验，得出了采空区跨度与岩体冒落范围的空间关系。其次，基于现场统计的冒落岩块数据，借助于摄像比对分析系统，进行了散体流动模拟实验，获取到冒落散体的速度及位移场。基于随机介质放矿理论，结合放矿实验，求出冒落散体松散漏斗方程，并获得了放矿量和上部冒落散体松散的关系。最后，基于拱形冒落原理，建立了底部进路放矿和冒落范围的关系模型。该关系模型为诱导冒落采矿法放矿的科学管理、冒落范围的有效控制，以及诱导冒落采矿法对复杂矿体形态适应能力的增强，提供了重要的理论和技术支撑。