冲击磨损作用下的溜井井壁变形破坏机理

Mechanism of Deformation and Failure on Orepass Wall Under Impact and Wear

世界范围内的溜井井壁变形破坏已成为影响金属矿山地下开采高效运行的重大问题,冲击与磨损是造成溜井井壁变形破坏的2大主要因素。通过矿岩冲击溜井井壁过程中能量与变形关系的研究,得出了矿岩块"碰撞"井壁时冲击与剪切破坏产生的机理。推导出了垂直溜井储矿段井壁和倾斜溜井底板的摩擦力计算公式。研究发现:垂直溜井中矿岩块对井壁冲击的结果,使井壁材料受到了冲击和剪切2种形式的损伤,而决定其主导地位的因素是矿岩块冲击井壁时的运动方向与井壁法向夹角的大小;磨损破坏主要发生在溜井的储矿段和倾斜溜井与分支溜井的底板。磨损破坏的程度取决于矿岩块与井壁材料间的摩擦系数的大小和矿岩作用在井壁法向上的力的大小。

The deformation and failure of the orepass wall worldwide has become a significant problem affecting the effi- ciency of underground mining in metal mine.Impact and wear are the two main factors that cause deformation and failure of pass shaft wall.Through study on the relationship between energy and deformation in the process of ore or rock impact on ore- pass lining,the mechanism of impact and shear failure caused by ore or rock block "colliding"with the orepass wall is ob- tained.The formulas for calculating the friction force on the lining of the ore storage section in vertical orepass and on the foot- wall of inclined orepass are derived.It is found that the deformation and failure caused by the movement of ore blocks in the vertical orepass contains two forms including impact and shear.The more dominant factor of determining the two forms is the angle between the direction of the ore or rock block movement and the normal direction of orepass wall when impinging on the orepass wall.Wear failure mainly occurs in the ore storage section of the orepass well and the footwall of the inclined and the branched orepass.The degree of wear failure depends on the friction coefficient between the ore or rock block and the orepass linin^material and the force of the ore or rock acting on the orepass wall.