岩柱失稳对岩柱-顶板系统扰动效应的数值模拟研究

Numerical simulation research on disturbance effects of the pillar-roof system caused by apillar failure

为了研究浅埋房柱式采空区岩柱群失稳机理,以吕梁某铝土矿采空区为研究区,建立采空区二维模型,运用有限元数值模拟的方法,分析单个岩柱失稳对岩柱群及采空区顶板产生的扰动效应。通过对岩柱-顶板系统应力场特征及监测点位移资料的分析,发现单一岩柱失稳后,荷载转移到其邻近岩柱上,并引起该岩柱应力集中及偏压,继而造成岩柱破坏,这种渐进演化导致了岩柱失稳的多米诺效应。

In order to study the instability mechanism of pillars in room mining goaf,based on geological data of the bauxite mining goaf in Lyuliang,a2D geological model is established and applied to study disturbance effects of the pillar-roof system caused by a sudden instability pillar by using finite element.Through analyzing the stress distribution and displacement changing laws of pillar-roof system,it is the concluded that a single pillar inadvertently failing the load could be transferred to adjacent pillars causing those to be stress concentration and unsymmetrically load,which are the driving factors of pillar failure.This successive overloading process leads to an unstable progressive “Domino” effect which causes widespread instability of pillars.