The mechanism of stress generation and propagation by detonation loading in five separate independent advance of ore breaking patterns is discussed in the paper. An elastic numerical model was developed using AN- SYS/...The mechanism of stress generation and propagation by detonation loading in five separate independent advance of ore breaking patterns is discussed in the paper. An elastic numerical model was developed using AN- SYS/LS-DYNA 3D Nonlinear Dynamic Finite Element Software. In this package ANSYS is the preprocessor and LS-DYNA is the postprocessor. Numerical models in the paper to actual were l：10 and the element mesh was dissected in scanning mode utilizing the symmetry characteristics of the numerical model. Five different advance rates were studied. Parameters, such as the time required to maximum stress, the action time of the available stress, the maximum velocity of the nodes, the stress penetration time, the magnitude of the stress peak and the time duration for high stress were numerically simulated. The 2.2 m advance appeared optimum from an analysis of the simulation results. The results from numerical simulation have been validated by tests with physical models.展开更多
针对毛公铁矿生产中矿石回收率低、崩落矿石放出量少的问题,依据其采场结构参数,进行了1.6 m、1.8 m 2种崩矿步距条件下矿石回收、矿石残留体形态及其形成过程的物理相似模拟放矿实验。实验结果表明:首采分段放矿时,矿石回收率基本稳定...针对毛公铁矿生产中矿石回收率低、崩落矿石放出量少的问题,依据其采场结构参数,进行了1.6 m、1.8 m 2种崩矿步距条件下矿石回收、矿石残留体形态及其形成过程的物理相似模拟放矿实验。实验结果表明:首采分段放矿时,矿石回收率基本稳定在40%~50%;第2分段以后的放矿中,矿石回收率稳定在70%~90%,混岩率稳定在35%左右;上一分段脊部残留矿石将在下一分段逐渐回收;放矿过程中正面废石会较早混入放矿过程,造成矿石贫化;综合分析实验结果得出:1.8 m崩矿步距矿石回收率优于1.6 m。展开更多
文摘The mechanism of stress generation and propagation by detonation loading in five separate independent advance of ore breaking patterns is discussed in the paper. An elastic numerical model was developed using AN- SYS/LS-DYNA 3D Nonlinear Dynamic Finite Element Software. In this package ANSYS is the preprocessor and LS-DYNA is the postprocessor. Numerical models in the paper to actual were l：10 and the element mesh was dissected in scanning mode utilizing the symmetry characteristics of the numerical model. Five different advance rates were studied. Parameters, such as the time required to maximum stress, the action time of the available stress, the maximum velocity of the nodes, the stress penetration time, the magnitude of the stress peak and the time duration for high stress were numerically simulated. The 2.2 m advance appeared optimum from an analysis of the simulation results. The results from numerical simulation have been validated by tests with physical models.
