文档介绍：第 24 卷第 16 期岩石力学与工程学报 Vol . 24 No. 16
2005 年 8 月 Chinese Journal of Rock Mechanics and Engineering Aug.,2005
爆破震动对采空区稳定性影响的 FLAC3D 分析
闫长斌,徐国元,李夕兵
(中南大学资源与安全工程学院,湖南长沙 410083)
摘要:针对厂坝铅锌矿受到乱采乱挖破坏的情况,运用 FLAC3D 对爆破震动作用下采空区的稳定性进行了数值分
析。根据现场实测数据,选取了 2 条不同的实测速度时程曲线作为爆破震动输入,分别进行了静力和动力计算。
分析结果表明:(1) 采空区开挖后,最大位移量为 mm;(2) 施加爆破动载荷后,最大位移量增至 mm,
增幅与爆破震动速度成正比;(3) 围岩位移分布的变化受震动波形的影响。爆破震动作用下围岩应力场发生二次重
分布,塑性区分布面积明显扩大,采空区右上方露天边坡脚亦受到影响。分析结果与实际观测结果相吻合,并给
出了避免爆破震动诱发采空区失稳塌陷的几条建议。
关键词:爆破工程;采矿工程;爆破震动;采空区;稳定性;FLAC3D;数值模拟
中图分类号:TD 235;TD 85 文献标识码:A 文章编号:1000–6915(2005)16–2894–06
STABILITY ANALYSIS OF MINED-OUT AREAS INFLUENCED BY
BLASTING VIBRATION WITH FLAC3D
YAN Chang-bin,XU Guo-yuan,LI Xi-bing
(School of Resources and Safety Engineering,Central South University,Changsha 410083,China)
Abstract:For the reason that Changba lead-zinc mine is severely destroyed by disordered mining,the numerical
analysis of mined-out areas under blasting vibration is carried out with FLAC3D . Two different measured velocity
time-dependent curves are selected as blasting vibration input according to the in-situ test data;and static
calculation and dynamic calculation are carried out,respectively. The analytical results show that the maximum
displacement of surrounding rock is mm after mined-out areas are excavated,while the maximum
displacement of surrounding ro