采空区稳定性数值模拟分析

Numerical simulation analysis on the stability of mined-out area

为了研究采空区的稳定性,在现场详尽调查、室内力学试验基础上,应用FLAC-3D方法对采空区应力分布规律以及围岩变形进行数值模拟,研究表明:随着各阶段矿体回采,空区各间柱及顶底板出现正应力集中区;各阶段空区间柱、顶底板、空区两侧围岩显现出压应力集中区;采场应力在增大,偏移量也相应的增大;矿柱在压应力的作用下可能形成突变剪切破坏.

In order to study the stability of mined-out area, FLAC-3D numerical simulation of the stress distribution law and surrounding rock deformation is carried out on the basic of detailed investigation and mechanical test. The researches show that ： empty area between the column and the normal stress of roof and floor show the normal stress clusters with the orebody stoping of each stage;offset increases accordingly with the increase of stope stress;pillar shear failure may form under the action of compressive stress.