基于室内模型试验的多漏斗同步放矿柔性隔离层材料受力特性分析

开展多漏斗放矿条件下柔性隔离层材料受力特性分析是放矿机理研究的基础。该文基于室内模型试验，测定了试验中隔离层所受拉应力和压应力，分析了隔离层材料的受力特性及失效条件。研究结果表明： 1）横向上，随测点与隔离层中心点距离的增大，隔离层内部拉应力值的变化趋势与正弦函数一致；隔离层所受压应力值逐渐减小，所受摩擦力值呈余弦函数形态变化；对应空腔部位的隔离层未受支持力作用，其余部位的隔离层所受支持力载荷的变化规律与压应力一致；2）纵向上，作用于隔离层的所有力系值随下降深度的增加而增大；隔离层接触底部结构前，其内部平均拉应力值随下降深度增加呈指数函数增大；隔离层所受拉应力最大值与下降深度的关系为σ_smax=-0.32+0.32e^0.005h，隔离层失效点满足等式s=±30.12 cm。

MECHANICAL PROPERTIES ANALYSIS FOR A FLEXIBLE ISOLATION LAYER MATERIAL IN MULTIPLE FUNNELS SYNCHRONOUS ORE DRAWING BASED ON A INDOOR MODEL EXPERIMENT

The development of mechanical properties of a flexible isolation layer material in ore drawing from multiple funnels is the foundation of ore drawing mechanism. The tensile stress and compressive stress of an isolation layer were measured using an indoor model experiment, and the mechanical properties and rupture condition of isolation-layer materials were analyzed. The results show that:1) in the transverse direction, with the increase in distance between measuring points and center point in an isolation layer, tensile stress changes sinusoidally; compressive stress decreases gradually and the friction changes cosinoidally; the isolation layer on cavity is not affected by its supporting force, and the variation law of the supporting force in other parts is the same as compressive stress; and 2) in the longitudinal direction, all forces acting on an isolation layer increase with the descending height; average tension stress increases exponentially before contacting funnels in the bottom of the model; correlation between the maximum tension stress and the descending height is σ_smax=-0.32+0.32e0.005h, and failure point satisfies equation of s=±30.12 cm.