同步充填工艺柔性隔离层物理力学参数范围研究

Research on the Range of Physical and Mechanical Parameters of Flexible Isolation Layer in Synchronous Filling Process

探讨柔性隔离层物理力学参数范围,有助于揭示同步充填放矿工艺中散体介质流动的本质规律。通过解析物理试验中隔离层全曲面所受力系,分析其曲面拉应力与压应力特性,确立了隔离层材料物理力学参数范围。研究表明:隔离层厚度与抗弯截面系数存在一定的函数关系,其厚度必须介于合适的范围;隔离层材料抗拉强度与其下降深度呈指数增长关系,隔离层下降深度越深,所需的隔离层材料抗拉强度就越大;抗压强度与下降深度呈指数增长,但随着隔离层下降深度的增加,抗压强度增长速率逐渐变缓;抗弯曲能力与隔离层材料的宽度成1次幂增加,与隔离层材料的厚度成3次幂增加;隔离层要有较大的耐摩系数。研究成果可为同步充填工艺过程中隔离层材料的科学选择提供理论指导。

The range of physical and mechanical parameters of flexible isolation layer was explored, which was conductive to re- veal the essential laws of granular media flow in the synchronous filling and ore drawing process. By resolving the mechanical system of the whole surface of isolation layer in physical experiments, the characteristics of tensile stress and compressive stress of the surface were analyzed, and the range of physical and mechanical parameters of isolation layer was determined. The results showed that there was a functional relation between the thickness of iso[ation layer and the parameters of bending sec- tion and the thickness must be in the an appropriate range. The tensile strength and decreasing depth of the isolation layer ma- terials showed an exponential increase, which meant that the deeper the deceasing depth of isolation layer, the greater the ten-sile strength. Then the compressive strength and the deceasing depth also had an exponentially increasing relation, but the in- creasing speed rate of compressive strength gradually slowed down with decreasing depth of isolation layer. The bending resist- ance would increase by first power with the width of isolation layer and increase by third power with the thickness of isolation layer. Consequently, the isolation layer should have a large friction coefficient. The research results could provide a theoretical guidance for the scientific selection of the isolation material in synchronous filling process.