拉底诱导的岩体崩落过程区数值模拟

拉底是自然崩落法最灵活,最具有主动性的人为控制崩落的因素,它通过直接或间接地改善岩体的可崩性,达到诱导持续崩落和降低矿岩大块率的目的。文中基于受拉条件下,岩体崩落是脆性破坏的事实,建立受拉条件下岩体崩落过程区损伤模型,作为岩体的崩落模型,将其嵌入到ANSYS后处理程序中,实现崩落过程区的自动搜索。以金川三矿区自然崩落为例,模拟分步拉底条件下,崩落过程区动态发展,界定了崩落区与损伤区,得出一些非常有指导意义的结论。

Numerical Simulation on Caving Process Zone Induced by Undercut

In mining method of block caving,undercut is the most feasible and active man-made factor used to control the caving process.Undercut can be used to realize a continuous caving and also used to reduce the rate of large fragments of rock by direct or indirect affection on the cavability of rock.In the paper,rock caving was regarded as an event of brittle fracture that always takes place in the vicinity above the undercut zone,where the rock was in a tensile state.And in the course of caving,there is a caving process zone which is consists of caving zone and damage zone.Based on these facts,the caving model of rock was established by defining a damage model in tensile state.In order to identify automatically the caving process zone,the caving model was embed in the postprocessor of ANSYS.As an example,block caving in Jinchuan Corp.Mine III was introduced.The simulation of caving was executed step by step in the total number of 6 steps.The caving process zone,clearly displayed from the result of simulation,was extremely mimic to that observed in the spot,and the damage zone and caved zone was divided distinctively.The more important was,from the simulation,some significant conclusions have been proposed to guide the practice in mining method of block caving.