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为分析端部放矿中放出体形态,获得大结构参数下最优的崩矿步距,基于颗粒元理论和PFC3D程序,构建具有矿石散体细观力学性质的放矿模型.通过已有研究结论与模拟结果的对比分析,验证了基于PFC程序的放矿模型的可靠性.在此基础上,开展18 m×20 m结构参数下不同端壁倾角崩矿步距研究.研究结果表明,不同倾角端壁条件下放出体形态不完整,并不是一个规则的椭球体.当放矿量相同时,放出体高度随端壁倾角的减小而增大,放出体整体形态也随之越来越“瘦长”.在无限边界和不同倾角端壁条件下,放出体高度的变化趋势均可概括为两个阶段:在放矿初始阶段,放出体高度呈指数形式快速增加,随放矿量的增加,其增长率逐渐减小;随后,放出体高度将随放矿量的增加而呈线性增长的趋势.建议在18 m×20m结构参数下采用85°~90°的端壁倾角,4.8 m的崩矿步距.
In order to analyze the morphology of the expelled body in the end draw, and obtain the optimum collapse step size under the large structural parameters, the ore-dressing model with the meso-mechanical properties of ore dispersion is constructed based on the particle element theory and the PFC3D program. The conclusion and simulation results are compared to verify the reliability of the ore-dressing model based on PFC program.On the basis of this, the study on the step-collapse of different end-wall dip in 18 m × 20 m structural parameters is carried out.The results show that different Inclination end wall under the conditions of release body shape is not complete, is not a regular ellipsoid.When the amount of the same ore release body height with the wall inclination decreases, the release of the overall shape also will be more and more "Thin , Then the growth rate will decrease gradually.Afterwards, the discharge body height will increase linearly with the increase of ore amount.It is suggested that the wall inclination of 85 ° ~ 90 ° should be adopted under the structure parameters of 18 m × 20m m collapse mine step.