基于多数值模拟方法联合的自然崩落法开采研究

Study on Natural Caving Mining Method Based on Multi-numerical Simulation Method

受复杂地质条件影响,自然崩落法因其技术含量高,在实际生产应用前,需开展大量的理论和开采技术研究工作。为实现自然崩落开采技术在矿床开采中的科学有效应用,充分利用多种数值分析软件各自的功能优势,以雪鸡坪铜矿自然崩落法研究为例,利用MIDAS优越的建模功能,建立了复杂力学计算模型,并通过MIDAS和FLAC3D的耦合技术,实现MIDAS到FLAC3D数值计算模型的转换,采用FLAC3D软件对矿区自然崩落法开采崩落范围进行了数值模拟与计算,并采用颗粒流离散元PFC2D软件对放矿过程进行了模拟,分析了多斗均衡放矿方式和放矿步距的合理性,通过多数值分析软件的联合应用,完成了对矿区自然崩落开采工艺的数值计算与放矿过程模拟,对于指导矿山自然崩落采矿工艺的应用具有重要的意义。

With the restriction of complex geological conditions and because of the high technical level of natural caving mining method,a lot of preliminary work on mining theory study and technology research has to be carried out before actual natural caving mining operations.In order to realize the scientific and effective application of natural caving mining technology,various functional advantages of numerical analyzing software have been fully exploited in this paper.Taken the actual application of natural caving mining method in Xuejiping copper mine as an example,with the help of the superior modeling function of MIDAS,the complex mechanical calculation model has been established.Meanwhile,by using the coupling technology of MIDAS and FLAC3 D,the conversion of numerical calculation model from MIDAS to FLAC3 Dhas been realized.The caving area for natural caving mining has been simulated and calculated in FLAC3 D.By using the particle flow discrete element method in PFC2 D software,ore drawing process has been simulated,and then the rationality of poly-draw-points drawing method and the suitable drawing intervals have been analyzed.Therefore,by the joint application of numerical analysis software,numerical calculation in natural caving mining and the simulation of drawing process have been realized. It is of great guiding importance in actual application of natural caving mining technology.