基于Phase^2的复杂采空区稳定性分析与评价

Stability Analysis and Evaluation for Complex Cavities Based on Phase^2

利用Phase2数值模拟软件,分别在水平和垂直剖面建立空区数值模型,对某矿三采区的空区稳定性进行了分析。研究发现,逐步回采完900中段的5个采场后,采空区的应力与位移都不会达到围岩的屈服极限,采空区是相对稳定的;继续回采采空区间柱或下中段矿体时,空区围岩的应力状态发生很大的变化,顶底板局部地方拉应力值达到岩石的抗拉强度,发生破坏,因此在进一步回采矿体时需要对采空区进行处理,保证矿山的安全生产。

A numerical model with horizontal and vertical section was established for gob by using numerical simulation software Phase2 for its stability analysis. It was found that gob areas after recovering five stopes at the middle section 900 was in a relative stable situation, with the stress and displacement of surrounding rock both lower than the yielding point. However, the continue stoping of column between gob area and orebody at lower middle section would bring a great change in the stress of surrounding rock, with the locale stress at the roof and floor up to the rock tensile strength, resulting in damage occurred. As such, some measures must be taken before further stoping in gob areas to ensure safety in mine production.